Airworthiness Directives; Boeing Model 747-400, 777-200, and 777-300 Series Airplanes, 61391-61395 [E6-17187]

Download as PDF Federal Register / Vol. 71, No. 201 / Wednesday, October 18, 2006 / Rules and Regulations Director as to whether the requested change is warranted, whenever feasible: (1) Within 60 days of receipt by the FDIC of the request for revision; (2) If additional institutions have been notified by the requesting institution or the FDIC, within 60 days of the date of the last response to the notification; or (3) If additional information has been requested by the FDIC, within 60 days of receipt of the additional information, whichever is later. Notice of the procedures applicable to appeals under paragraph (g) of this section will be included with the Director’s written determination. (g) An insured depository institution may appeal the determination of the Director to the FDIC’s Assessment Appeals Committee on the same grounds as set forth under paragraph (a) of this section. Any such appeal must be submitted within 30 calendar days from the date of the Director’s written determination. The decision of the Assessment Appeals Committee shall be the final determination of the FDIC. § 327.55 Sunset date. Subpart C shall cease to be effective on December 31, 2008. Dated at Washington, DC, this 10th day of October, 2006. By order of the Board of Directors. Federal Deposit Insurance Corporation. Robert E. Feldman, Executive Secretary. [FR Doc. E6–17304 Filed 10–17–06; 8:45 am] BILLING CODE 6714–01–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. 2000–NM–360–AD; Amendment 39–14789; AD 2006–21–05] RIN 2120–AA64 Airworthiness Directives; Boeing Model 747–400, 777–200, and 777–300 Series Airplanes Federal Aviation Administration, DOT. ACTION: Final rule. hsrobinson on PROD1PC76 with RULES AGENCY: SUMMARY: This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747– 400, 777–200, and 777–300 series airplanes. This AD requires, for certain airplanes, replacing the cell stack of the flight deck humidifier with a suppliertested cell stack, or replacing the cell stack with a blanking plate and subsequently deactivating the flight VerDate Aug<31>2005 15:59 Oct 17, 2006 Jkt 211001 deck humidifier. For certain other airplanes, this AD requires an inspection of the flight deck humidifier to determine certain part numbers and replacing the cell stack if necessary. This AD also allows blanking plates to be replaced with cell stacks. The actions specified by this AD are intended to prevent an increased pressure drop across the humidifier and consequent reduced airflow to the flight deck, which could result in the inability to clear any smoke that might appear in the flight deck. This action is intended to address the identified unsafe condition. Effective November 22, 2006. The incorporation by reference of certain publications listed in the regulations is approved by the Director of the Federal Register as of November 22, 2006. DATES: The service information referenced in this AD may be obtained from Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124–2207. This information may be examined at the Federal Aviation Administration (FAA), Transport Airplane Directorate, Rules Docket, 1601 Lind Avenue, SW., Renton, Washington. ADDRESSES: FOR FURTHER INFORMATION CONTACT: Jeffrey S. Palmer, Aerospace Engineer, Cabin Safety and Environmental Systems Branch, ANM–150S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98055–4056; telephone (425) 917–6481; fax (425) 917–6590. A proposal to amend part 39 of the Federal Aviation Regulations (14 CFR part 39) to include an airworthiness directive (AD) that is applicable to certain Boeing Model 747–400, 777–200, and 777–300 series airplanes was published as a second supplemental notice of proposed rulemaking (NPRM) in the Federal Register on January 4, 2006 (71 FR 299). That action proposed to require, for certain airplanes, replacing the cell stack of the flight deck humidifier with a supplier-tested cell stack, or replacing the cell stack with a blanking plate and subsequently deactivating the flight deck humidifier. For certain other airplanes, that action proposed to require an inspection of the flight deck humidifier to determine certain part numbers and replacing the cell stack if necessary. That action also proposed to allow blanking plates to be replaced with cell stacks. That action also proposed to add airplanes to the applicability. SUPPLEMENTARY INFORMATION: PO 00000 Frm 00019 Fmt 4700 Sfmt 4700 61391 Actions Since Second Supplemental NPRM (SNPRM) Was Issued Since we issued the second SNPRM, Boeing has issued Service Bulletin 747– 21A2414, Revision 3, dated May 12, 2006; and Service Bulletin 777– 21A0048, Revision 3, dated May 12, 2006. Boeing Alert Service Bulletin 747–21A2414, Revision 2, dated July 7, 2005; and Boeing Alert Service Bulletin 777–21A0048, Revision 2, dated July 14, 2005, were referenced as the appropriate sources of service information for doing certain actions proposed in the second SNPRM. Both service bulletins, Revision 3, contain essentially the same procedures as the corresponding service bulletins, Revision 2. We have revised this final rule to refer to Revision 3 of these service bulletins. We have also added Boeing Alert Service Bulletin 747–21A2414, Revision 2, to paragraphs (b) and (g) of this final rule and added Boeing Alert Service Bulletin 777–21A0048, Revision 2, to paragraphs (e) and (h) of this final rule to allow credit for actions done in accordance with Revision 2 of the service bulletins. Operators should note that Boeing Service Bulletin 747–21A2414, Revision 3, dated May 12, 2006, specifies Group 1 as ‘‘all 747–400 airplanes with Hamilton Sundstrand flight deck humidifier 821486–01.’’ However, the correct part number for the humidifier is 821486–1. We have added Note 1 to this final rule to indicate that Group 1 is identified as all 747–400 airplanes with Hamilton Sundstrand flight deck humidifier 821486–1. Comments Interested persons have been afforded an opportunity to participate in the making of this amendment. Due consideration has been given to the comments received. Support for the Second SNPRM Boeing, the manufacturer, concurs with the content of the second SNPRM. Request To Remove Airplanes From the Second SNPRM United Airlines (UAL) does not agree with the contents of the second SNPRM for the Model 747–400 series airplanes and feels that regulatory action is not necessary to ensure the intent of the second SNPRM for these airplanes. UAL states that it took immediate steps to comply with Boeing and Hamilton Sundstrand service bulletins specified in the second SNPRM. UAL notes that because the reliability of the humidifier was extremely poor at the time that the cell stack concern was identified, the humidifier cell stacks have been E:\FR\FM\18OCR1.SGM 18OCR1 61392 Federal Register / Vol. 71, No. 201 / Wednesday, October 18, 2006 / Rules and Regulations replaced many times since the year 2000. UAL states that the removed cell stacks were sent to Hamilton Sundstrand for repair and modification and that Hamilton Sundstrand is the sole source for repair and modification. Therefore, UAL concludes that the intent of the second SNPRM for the 747–400 airplanes can be satisfied by examining Hamilton Sundstrand’s maintenance records for the cell stack. We disagree. Regulatory action is necessary to ensure that Model 747–400 series airplanes do the actions in this final rule. A review by the airplane manufacturer of the Hamilton Sundstrand records shows that about 10 defective humidifier cell stacks are in circulation among the Model 747–400 fleet. This final rule will prevent any of those humidifiers, having cell stack part number (P/N) 821482–1, from being installed as replacements on any airplanes unless ‘‘DEV 13433’’ is marked next to the cell stack P/N. We have not changed the final rule in this regard. UAL also does not agree with the contents of the second SNPRM for the Model 777–200 series airplanes and feels that regulatory action is not necessary to ensure the intent of the second SNPRM for these airplanes. UAL states that the airplanes identified as Group 6 in Boeing Service Bulletin 777– 21A0048, Revision 3, dated May 12, 2006, were added to the service bulletin because the airplanes were scheduled to have the humidifiers retrofitted as part of the crew rest project; however, the installation was canceled and no airplanes were retrofitted with the humidifiers. We disagree. Regulatory action is necessary to ensure that Model 777–200 series airplanes do the actions in this final rule. A review by the airplane manufacturer of the Hamilton Sundstrand records shows that about 14 defective humidifier cell stacks are in circulation among the Model 777 fleet. This final rule will prevent any of those humidifiers, having cell stack P/N 822976–2, from being installed as replacements on any airplanes unless ‘‘DEV 13433’’ is marked next to the cell stack P/N. We have not changed the final rule in this regard. Request To Allow Compliance With Maintenance Records UAL also requests that if Model 747– 400 series airplanes are not allowed to be removed from the requirements of the second SNPRM as requested above, then the only regulatory actions imposed on operators should be limited to demonstrating compliance through their own maintenance records. We partially agree with the commenter. In paragraph (c) of this final rule we do allow a review of airplane maintenance records to determine the P/ N of the flight deck humidifier instead of doing the inspection. We have determined that a review of the maintenance records is also acceptable if it can be determined that the flight deck humidifier is not installed. We have revised paragraph (c) to state that ‘‘instead of inspecting the flight deck humidifier, a review of airplane maintenance records along with any other applicable data is acceptable if the P/N of the flight deck humidifier can be positively determined from that review or if it can be positively determined that the flight deck humidifier is not installed on the airplane.’’ Request To Allow Equivalent Blanking Plate Installation UAL also requests that we consider the blanking plate installation and humidifier system deactivation done in accordance with Boeing Service Bulletin 777–21–0087, dated June 17, 2004; and Hamilton Sundstrand Service Bulletin 816086–21–01, dated March 15, 2000; as equivalent to the blanking plate installation done in accordance with Boeing Alert Service Bulletin 777– 21A0048, Revision 2, dated July 14, 2005 (specified in paragraph (f) of the second SNPRM). The commenter states that it has deactivated the humidifiers and replaced the cell stacks with blanking plates on all Group 7 airplanes identified in Boeing Alert Service Bulletin 777–21–0048, registration numbers 09UA and 16UA–29UA, by doing the actions in Boeing Service Bulletin 777–21–0087 and Hamilton Sundstrand Service Bulletin 816086– 21–01. The commenter also notes that the airplane having registration number 09UA, was delivered with a deactivated humidifier and only needed modification by doing the blanking plate installation per Hamilton Sundstrand Service Bulletin 816086– 21–01. We agree with the commenter. We have revised paragraph (f)(2)(ii) of this final rule to give credit for airplanes on which the replacement and deactivation are done in accordance with Boeing Service Bulletin 777–21–0087 and Hamilton Sundstrand Service Bulletin 816086–21–01 for those Group 7 airplanes listed in Boeing Service Bulletin 777–21–0087, dated June 17, 2004. We have also determined that a review of the maintenance records is acceptable instead of the inspection specified in paragraph (f) of this final rule if it can be determined that the flight deck humidifier is not installed. We have revised paragraph (f) to state that ‘‘instead of inspecting the flight deck humidifier, a review of airplane maintenance records along with any other applicable data is acceptable if the P/N of the flight deck humidifier can be positively determined from that review or if it can be positively determined that the flight deck humidifier is not installed on the airplane.’’ Conclusion After careful review of the available data, including the comments noted above, the FAA has determined that air safety and the public interest require the adoption of the rule with the changes described previously. The FAA has determined that these changes will neither increase the economic burden on any operator nor increase the scope of the AD. Cost Impact There are approximately 176 airplanes of the affected design in the worldwide fleet. The FAA estimates that this AD affects 29 airplanes of U.S. registry. The cost per airplane ranges between $390 and $6,248 per airplane, depending on the actions chosen by the operator. The fleet cost estimate does not exceed $181,192. ESTIMATED COSTS Work hours hsrobinson on PROD1PC76 with RULES Model/series Action 747–400, 777–200, 777–300 ... Inspect flight deck humidifier for P/N and inspect flight deck humidifier cell stack for P/N. Replace cell stack with new or supplier-tested cell stack ........ Replace cell stack with blanking plate and deactivate humidifier. Replace cell stack with blanking plate ...................................... 747–400 ................................... 747–400 ................................... 777–200, 777–300 ................... VerDate Aug<31>2005 15:59 Oct 17, 2006 Jkt 211001 PO 00000 Frm 00020 Fmt 4700 Sfmt 4700 E:\FR\FM\18OCR1.SGM Hourly rate Cost per airplane Parts cost 1 $65 $0 $65 3 5 65 65 5,100 0 5,295 325 3 65 0 195 18OCR1 Federal Register / Vol. 71, No. 201 / Wednesday, October 18, 2006 / Rules and Regulations 61393 ESTIMATED COSTS—Continued Work hours Model/series Action 777–200, 777–300 ................... 777–200, 777–300 ................... Replace cell stack with new or supplier-tested cell stack ........ Replace blanking plate with supplier-tested cell stack ............. The cost impact figures discussed above are based on assumptions that no operator has yet accomplished any of the requirements of this AD action, and that no operator would accomplish those actions in the future if this AD were not adopted. The cost impact figures discussed in AD rulemaking actions represent only the time necessary to perform the specific actions actually required by the AD. These figures typically do not include incidental costs, such as the time required to gain access and close up, planning time, or time necessitated by other administrative actions. hsrobinson on PROD1PC76 with RULES Authority for This Rulemaking Title 49 of the United States Code specifies the FAA’s authority to issue rules on aviation safety. Subtitle I, Section 106, describes the authority of the FAA Administrator. Subtitle VII, Aviation Programs, describes in more detail the scope of the Agency’s authority. We are issuing this rulemaking under the authority described in Subtitle VII, Part A, Subpart III, Section 44701, ‘‘General requirements.’’ Under that section, Congress charges the FAA with promoting safe flight of civil aircraft in air commerce by prescribing regulations for practices, methods, and procedures the Administrator finds necessary for safety in air commerce. This regulation is within the scope of that authority because it addresses an unsafe condition that is likely to exist or develop on products identified in this rulemaking action. Regulatory Impact The regulations adopted herein will not have a substantial direct effect on the States, on the relationship between the national Government and the States, or on the distribution of power and responsibilities among the various levels of government. Therefore, it is determined that this final rule does not have federalism implications under Executive Order 13132. For the reasons discussed above, I certify that this action (1) is not a ‘‘significant regulatory action’’ under Executive Order 12866; (2) is not a ‘‘significant rule’’ under DOT Regulatory Policies and Procedures (44 FR 11034, February 26, 1979); and (3) VerDate Aug<31>2005 15:59 Oct 17, 2006 Jkt 211001 will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act. A final evaluation has been prepared for this action and it is contained in the Rules Docket. A copy of it may be obtained from the Rules Docket at the location provided under the caption ADDRESSES. List of Subjects in 14 CFR Part 39 Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. Adoption of the Amendment Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as follows: I PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: I Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. Section 39.13 is amended by adding the following new airworthiness directive: I 2006–21–05 Boeing: Amendment 39–14789. Docket 2000–NM–360–AD. Applicability: Model 747–400, 777–200, and 777–300 series airplanes, certificated in any category; as identified in Boeing Service Bulletin 747–21A2414, Revision 3, dated May 12, 2006; and Boeing Service Bulletin 777–21A0048, Revision 3, dated May 12, 2006. Compliance: Required as indicated, unless accomplished previously. To prevent an increased pressure drop across the humidifier and consequent reduced airflow to the flight deck, which could result in the inability to clear any smoke that might appear in the flight deck, accomplish the following: Cell Stack Replacement: Model 747–400 Series Airplanes (a) For Model 747–400 series airplanes identified as Group 1 in Boeing Service Bulletin 747–21A2414, Revision 3, dated May 12, 2006: Within 90 days after the effective date of this AD, do the replacement specified in paragraph (a)(1) or (a)(2) of this AD. For flight deck humidifiers with a blanking plate: If the blanking plate is PO 00000 Frm 00021 Fmt 4700 Sfmt 4700 Hourly rate 3 1 65 65 Parts cost 6,053 6,053 Cost per airplane 6,248 6,118 removed and a new or supplier-tested cell stack is installed, the replacement must be done in accordance with the Accomplishment Instructions of Hamilton Sundstrand Service Bulletins 821486–21–01, dated March 15, 2000; and after the replacement, the flight deck humidifier may be activated in accordance with the Accomplishment Instructions of Boeing Service Bulletin 747–21–2405, Revision 4, dated July 29, 1999. Note 1: Boeing Service Bulletin 747– 21A2414, Revision 3, dated May 12, 2006, specifies Group 1 as ‘‘all 747–400 airplanes with Hamilton Sundstrand flight deck humidifier 821486–01.’’ The correct part number (P/N) for the humidifier is 821486– 1. (1) Replace the cell stack of the flight deck humidifier with a supplier-tested cell stack, in accordance with Part 1 of the Accomplishment Instructions of Boeing Service Bulletin 747–21A2414, Revision 3, dated May 12, 2006. (2) Replace the cell stack of the flight deck humidifier with a blanking plate and, before further flight, deactivate the flight deck humidifier, in accordance with Part 2 of the Accomplishment Instructions of Boeing Service Bulletin 747–21A2414, Revision 3, dated May 12, 2006. Note 2: Boeing Service Bulletin 747– 21A2414, Revision 3, dated May 12, 2006, refers to Boeing Service Bulletin 747–21– 2405, Revision 4, dated July 29, 1999, as an additional source of service information for deactivating the humidifier. Note 3: Boeing Service Bulletin 747– 21A2414, Revision 3, dated May 12, 2006, refers to Hamilton Sundstrand Service Bulletin 821486–21–01, dated March 15, 2000, as an additional source of service information for the cell stack replacements. (b) Replacement of the cell stack before the effective date of this AD in accordance with Boeing Alert Service Bulletin 747–21A2414, dated April 13, 2000; Revision 1, dated October 26, 2000; or Revision 2, dated July 7, 2005; is acceptable for compliance with the applicable requirements of paragraphs (a)(1) and (a)(2) of this AD. Inspections/Records Review: Model 747–400 Series Airplanes (c) For Model 747–400 series airplanes identified as Groups 2 and 3 in Boeing Service Bulletin 747–21A2414, Revision 3, dated May 12, 2006: Within 90 days after the effective date of this AD, inspect the flight deck humidifier to determine whether P/N 821486–1 is installed, in accordance with Part 3 of the Accomplishment Instructions of Boeing Service Bulletin 747–21A2414, Revision 3, dated May 12, 2006. Instead of inspecting the flight deck humidifier, a E:\FR\FM\18OCR1.SGM 18OCR1 61394 Federal Register / Vol. 71, No. 201 / Wednesday, October 18, 2006 / Rules and Regulations hsrobinson on PROD1PC76 with RULES review of airplane maintenance records along with any other applicable data is acceptable if the P/N of the flight deck humidifier can be positively determined from that review or if it can be positively determined that the flight deck humidifier is not installed on the airplane. (1) If a P/N other than P/N 821486–1 is installed or if the flight deck humidifier is not installed, no further action is required by this paragraph. (2) If P/N 821486–1 is installed, inspect the flight deck humidifier cell stack to determine whether P/N 821482–1 is installed and ‘‘DEV 13433’’ is not marked next to the cell stack P/N, in accordance with Part 3 of the Accomplishment Instructions of the service bulletin. Instead of inspecting the flight deck humidifier cell stack, a review of airplane maintenance records is acceptable if the P/N, including whether ‘‘DEV 13433’’ is marked next to the P/N, of the flight deck humidifier cell stack can be positively determined from that review. (i) If the cell stack has P/N 821482–2 or 1003111–2, or if ‘‘DEV 13433’’ is marked next to P/N 821482–1, no further action is required by this paragraph. (ii) If the cell stack has P/N 821482–1 and does not have ‘‘DEV 13433’’ marked next to the cell stack P/N: Before further flight, do the replacement specified in paragraph (a) of this AD. Cell Stack Replacement: Model 777–200 and –300 Series Airplanes (d) For Model 777–200 and 777–300 series airplanes identified as Groups 1 through 5 in Boeing Service Bulletin 777–21A0048, Revision 3, dated May 12, 2006: Within 90 days after the effective date of this AD, do the replacement specified in paragraph (d)(1) or (d)(2) of this AD. For flight deck humidifiers with a blanking plate: If a blanking plate is removed and a new or supplier-tested cell stack installed, the cell stack installation must be done in accordance with Part 3 of the Accomplishment Instructions of Boeing Service Bulletin 777–21A0048, Revision 3, dated May 12, 2006; and after the installation, the humidifier system may be activated in accordance with Accomplishment Instructions of Boeing Service Bulletin 777–21–0035, Revision 1, dated October 19, 2000. (1) Replace the cell stack with a blanking plate, in accordance with Part 1 of the Accomplishment Instructions of Boeing Service Bulletin 777–21A0048, Revision 3, dated May 12, 2006; and, before further flight, deactivate the humidifier system in accordance with a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, or in accordance with data meeting the certification basis of the airplane approved by an Authorized Representative for the Boeing Commercial Airplanes Delegation Option Authorization who has been authorized by the Manager, Seattle ACO, to make those findings. For a deactivation method to be approved, the deactivation must meet the certification basis VerDate Aug<31>2005 15:59 Oct 17, 2006 Jkt 211001 of the airplane, and the approval must specifically reference this AD. (2) Replace the cell stack with a suppliertested cell stack, in accordance with Part 2 of the Accomplishment Instructions of Boeing Service Bulletin 777–21A0048, Revision 3, dated May 12, 2006. Note 4: Boeing Service Bulletin 777– 21A0048, Revision 3, dated May 12, 2006, refers to Hamilton Sundstrand Service Bulletin 816086–21–01, dated March 15, 2000, as an additional source of service information for the cell stack replacement. (e) Replacement of the cell stack before the effective date of this AD in accordance with Boeing Service Bulletin 777–21A0048, Revision 1, dated September 7, 2000; or Boeing Alert Service Bulletin 777–21A0048, Revision 2, dated July 14, 2005; is acceptable for compliance with the applicable requirements of paragraphs (d)(1) and (d)(2) of this AD. Inspections/Records Review: Model 777–200 and –300 Series Airplanes (f) For Model 777–200 and 777–300 series airplanes identified as Groups 6 and 7 in Boeing Service Bulletin 777–21A0048, Revision 3, dated May 12, 2006: Within 90 days after the effective date of this AD, inspect the flight deck humidifier to determine if it is P/N 816086–1, in accordance with Part 4 of the Accomplishment Instructions of Boeing Service Bulletin 777–21A0048, Revision 3, dated May 12, 2006. Instead of inspecting the flight deck humidifier, a review of airplane maintenance records along with any other applicable data is acceptable if the P/N of the flight deck humidifier can be positively determined from that review or if it can be positively determined that the flight deck humidifier is not installed on the airplane. (1) If a P/N other than P/N 816086–1 is installed or if the flight deck humidifier is not installed, no further action is required by this paragraph. (2) If P/N 816086–1 is installed, inspect the flight deck humidifier cell stack to determine whether P/N 822976–2 is installed and ‘‘DEV 13433’’ is not marked next to the cell stack P/N, in accordance with Part 4 of the Accomplishment Instructions of the service bulletin. Instead of inspecting the flight deck humidifier cell stack, a review of airplane maintenance records is acceptable if the P/N, including whether ‘‘DEV 13433’’ is marked next to the P/N, of the flight deck humidifier cell stack can be positively determined from that review. (i) If the cell stack has P/N 822976–3 or 1003111–1, or if ‘‘DEV 13433’’ is marked next to P/N 822976–2, no further action is required by this paragraph. (ii) If the cell stack has P/N 822976–2 and does not have ‘‘DEV 13433’’ marked next to the cell stack P/N, before further flight, do the replacement specified in paragraph (d) of this AD. Doing the replacement of the cell stack with a blanking plate, in accordance with paragraph 3.A. of the Accomplishment Instructions of Hamilton Sundstrand Service PO 00000 Frm 00022 Fmt 4700 Sfmt 4700 Bulletin 816086–21–01, dated March 15, 2000; and the deactivation of the humidifier system, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777–21–0087, dated June 17, 2004; is acceptable for compliance with paragraph (d)(1) of this AD for those Group 7 airplanes listed in Boeing Service Bulletin 777–21–0087, dated June 17, 2004. Actions Accomplished According to Previous Issue of Service Bulletin (g) Inspections accomplished before the effective date of this AD in accordance with Boeing Alert Service Bulletin 747–21A2414, Revision 2, dated July 7, 2005, are considered acceptable for compliance with the corresponding action specified in paragraph (c) of this AD. (h) Inspections accomplished before the effective date of this AD in accordance with Boeing Alert Service Bulletin 777–21A0048, Revision 2, dated July 14, 2005, are considered acceptable for compliance with the corresponding action specified in paragraph (f) of this AD. Parts Installation (i) On Model 747–400 series airplanes: As of the effective date of this AD, no person may install a flight deck humidifier cell stack having P/N 821482–1, unless ‘‘DEV 13433’’ is also marked next to the cell stack P/N. (j) On Model 777–200 and 777–300 series airplanes: As of the effective date of this AD, no person may install a flight deck humidifier cell stack having P/N 822976–2, unless ‘‘DEV 13433’’ is also marked next to the cell stack P/N. Alternative Methods of Compliance (k)(1) In accordance with 14 CFR 39.19, the Manager, Seattle ACO, is authorized to approve alternative methods of compliance for this AD. (2) Before using any AMOC approved in accordance with 14 CFR 39.19 on any airplane to which the AMOC applies, notify the appropriate principal inspector in the FAA Flight Standards Certificate Holding District Office. Incorporation by Reference (l) Unless otherwise specified in this AD, the actions must be done in accordance with the applicable service bulletins listed in Table 1 of this AD. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part 51. To get copies of this service information, contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124–2207. To inspect copies of this service information, go to the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the NARA, call (202) 741–6030, or go to https://www.archives.gov/ federal_register/code_of_federal_regulations/ ibr_locations.html. E:\FR\FM\18OCR1.SGM 18OCR1 Federal Register / Vol. 71, No. 201 / Wednesday, October 18, 2006 / Rules and Regulations 61395 TABLE 1.—MATERIAL INCORPORATED BY REFERENCE Service Bulletin Revision level Boeing Service Bulletin 747–21A2414 ................................................................................................. Boeing Service Bulletin 747–21–2405 ................................................................................................. Boeing Service Bulletin 777–21A0048 ................................................................................................. Boeing Service Bulletin 777–21–0035 ................................................................................................. Boeing Service Bulletin 777–21–0087 ................................................................................................. Hamilton Sundstrand Service Bulletin 816086–21–01 ........................................................................ Hamilton Sundstrand Service Bulletin 821486–21–01 ........................................................................ 3 ....................... 4 ....................... 3 ....................... 1 ....................... Original ............. Original ............. Original ............. Effective Date (m) This amendment becomes effective on November 22, 2006. Issued in Renton, Washington, on October 6, 2006. Kalene C. Yanamura, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. E6–17187 Filed 10–17–06; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2006–25809; Directorate Identifier 2001–NE–30–AD; Amendment 39– 14791; AD 2006–17–07R1] RIN 2120–AA64 Airworthiness Directives; Pratt & Whitney JT8D–1, –1A, –1B, –7, –7A, –7B, –9, –9A, –11, –15, –15A, –17, –17A, –17R, –17AR, –209, –217, –217A, –217C, and –219 Turbofan Engines Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Final rule; correction. hsrobinson on PROD1PC76 with RULES AGENCY: SUMMARY: The FAA is revising an existing airworthiness directive (AD) for Pratt & Whitney (PW) JT8D–1, –1A, –1B, –7, –7A, –7B, –9, –9A, –11, –15, –15A, –17, –17A, –17R, –17AR, –209, –217, –217A, –217C, and –219 turbofan engines. That AD currently requires either replacing high pressure compressor (HPC) front hubs and HPC disks that have operated at any time with PWA 110–21 coating and that operated in certain engine models, or, visually inspecting and fluorescent penetrant inspecting (FMPI) for cracking of those parts and re-plating them if they pass inspection. This AD requires the same actions, but makes necessary corrections to inadvertent reference errors and omissions found in AD 2006– VerDate Aug<31>2005 15:59 Oct 17, 2006 Jkt 211001 17–07, and relaxes some of the compliance times in Table 5. This AD results from our finding reference errors and omissions in AD 2006–17–07, from determining that the AD as drafted imposed an unnecessary burden on operators if they have to immediately remove engines, and from requests to clarify compliance paragraphs. We are issuing this AD to prevent a rupture of an HPC front hub or an HPC disk that could result in an uncontained engine failure and damage to the airplane. DATES: This AD becomes effective November 2, 2006. The Director of the Federal Register previously approved the incorporation by reference of certain publications listed in the regulations as of October 4, 2006 (71 FR 51459, August 30, 2006). ADDRESSES: You can get the service information identified in this AD from Pratt & Whitney, 400 Main St., East Hartford, CT 06108, telephone (860) 565–7700; fax (860) 565–1605. You may examine the AD docket on the Internet at https://dms.dot.gov or in Room PL–401 on the plaza level of the Nassif Building, 400 Seventh Street, SW., Washington, DC. FOR FURTHER INFORMATION CONTACT: Keith Lardie, Aerospace Engineer, Engine Certification Office, FAA, Engine and Propeller Directorate, 12 New England Executive Park, Burlington, MA 01803; telephone (781) 238–7189; fax (781) 238–7199. SUPPLEMENTARY INFORMATION: On August 21, 2006, the FAA issued AD 2006–17– 07, Amendment 39–14728 (71 FR 51459, August 30, 2006). That AD requires either replacing HPC front hubs and HPC disks that have operated at any time with PWA 110–21 coating and that operated in certain engine models, or, visually inspecting and FMPI for cracking of those parts and re-plating them if they pass inspection. That AD was the result of an investigation by PW, which concluded that any HPC front hub or HPC disk coated with PWA PO 00000 Frm 00023 Fmt 4700 Sfmt 4700 Date May 12, 2006. July 29, 1999. May 12, 2006. October 19, 2000. June 17, 2004. March 15, 2000. March 15, 2000. 110–21 that ever operated on JT8D–15, –15A, –17, –17A, –17R, –17AR, –209, –217, –217A, –217C, and –219 turbofan engines, could crack before reaching their published life limit. That condition, if not corrected, could result in an uncontained engine failure and damage to the airplane. Examining the AD Docket You may examine the docket that contains the AD, any comments received, and any final disposition in person at the Docket Management Facility Docket Office between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The Docket Office (telephone (800) 647–5227) is located on the plaza level of the Department of Transportation Nassif Building at the street address stated in ADDRESSES. Comments will be available in the AD docket shortly after the DMS receives them. Actions Since AD 2006–17–07 Was Issued After we issued AD 2006–17–07, we found reference errors and omissions. These errors and omissions could affect your ability to comply with the AD. The following errors and omissions were discovered. We made the associated corrections: • In the third column of Table 1 of this AD, we omitted ‘‘–17A’’ in two places. We added the missing ‘‘–17A’’ from AD 2006–17–07 in both places. • The third column of Table 4 and Table 5 reads ‘‘Paragraph (h)(3) of this AD’’. Paragraph (h)(3) does not exist. We corrected it to read ‘‘Paragraph (j) of this AD.’’ We also determined that based on the compliance times in Table 5 of AD 2006–17–07, some operators might have to immediately remove their engines from service. If so, we concluded that those immediate removals might impose an unanticipated undue burden. Table 5 of AD 2006–17–07, appears below. E:\FR\FM\18OCR1.SGM 18OCR1

Agencies

[Federal Register Volume 71, Number 201 (Wednesday, October 18, 2006)]
[Rules and Regulations]
[Pages 61391-61395]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E6-17187]


=======================================================================
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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 2000-NM-360-AD; Amendment 39-14789; AD 2006-21-05]
RIN 2120-AA64


Airworthiness Directives; Boeing Model 747-400, 777-200, and 777-
300 Series Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

-----------------------------------------------------------------------

SUMMARY: This amendment adopts a new airworthiness directive (AD), 
applicable to certain Boeing Model 747-400, 777-200, and 777-300 series 
airplanes. This AD requires, for certain airplanes, replacing the cell 
stack of the flight deck humidifier with a supplier-tested cell stack, 
or replacing the cell stack with a blanking plate and subsequently 
deactivating the flight deck humidifier. For certain other airplanes, 
this AD requires an inspection of the flight deck humidifier to 
determine certain part numbers and replacing the cell stack if 
necessary. This AD also allows blanking plates to be replaced with cell 
stacks. The actions specified by this AD are intended to prevent an 
increased pressure drop across the humidifier and consequent reduced 
airflow to the flight deck, which could result in the inability to 
clear any smoke that might appear in the flight deck. This action is 
intended to address the identified unsafe condition.

DATES: Effective November 22, 2006.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of November 22, 2006.

ADDRESSES: The service information referenced in this AD may be 
obtained from Boeing Commercial Airplanes, P.O. Box 3707, Seattle, 
Washington 98124-2207. This information may be examined at the Federal 
Aviation Administration (FAA), Transport Airplane Directorate, Rules 
Docket, 1601 Lind Avenue, SW., Renton, Washington.

FOR FURTHER INFORMATION CONTACT: Jeffrey S. Palmer, Aerospace Engineer, 
Cabin Safety and Environmental Systems Branch, ANM-150S, FAA, Seattle 
Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, 
Washington 98055-4056; telephone (425) 917-6481; fax (425) 917-6590.

SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal 
Aviation Regulations (14 CFR part 39) to include an airworthiness 
directive (AD) that is applicable to certain Boeing Model 747-400, 777-
200, and 777-300 series airplanes was published as a second 
supplemental notice of proposed rulemaking (NPRM) in the Federal 
Register on January 4, 2006 (71 FR 299). That action proposed to 
require, for certain airplanes, replacing the cell stack of the flight 
deck humidifier with a supplier-tested cell stack, or replacing the 
cell stack with a blanking plate and subsequently deactivating the 
flight deck humidifier. For certain other airplanes, that action 
proposed to require an inspection of the flight deck humidifier to 
determine certain part numbers and replacing the cell stack if 
necessary. That action also proposed to allow blanking plates to be 
replaced with cell stacks. That action also proposed to add airplanes 
to the applicability.

Actions Since Second Supplemental NPRM (SNPRM) Was Issued

    Since we issued the second SNPRM, Boeing has issued Service 
Bulletin 747-21A2414, Revision 3, dated May 12, 2006; and Service 
Bulletin 777-21A0048, Revision 3, dated May 12, 2006. Boeing Alert 
Service Bulletin 747-21A2414, Revision 2, dated July 7, 2005; and 
Boeing Alert Service Bulletin 777-21A0048, Revision 2, dated July 14, 
2005, were referenced as the appropriate sources of service information 
for doing certain actions proposed in the second SNPRM. Both service 
bulletins, Revision 3, contain essentially the same procedures as the 
corresponding service bulletins, Revision 2. We have revised this final 
rule to refer to Revision 3 of these service bulletins.
    We have also added Boeing Alert Service Bulletin 747-21A2414, 
Revision 2, to paragraphs (b) and (g) of this final rule and added 
Boeing Alert Service Bulletin 777-21A0048, Revision 2, to paragraphs 
(e) and (h) of this final rule to allow credit for actions done in 
accordance with Revision 2 of the service bulletins.
    Operators should note that Boeing Service Bulletin 747-21A2414, 
Revision 3, dated May 12, 2006, specifies Group 1 as ``all 747-400 
airplanes with Hamilton Sundstrand flight deck humidifier 821486-01.'' 
However, the correct part number for the humidifier is 821486-1. We 
have added Note 1 to this final rule to indicate that Group 1 is 
identified as all 747-400 airplanes with Hamilton Sundstrand flight 
deck humidifier 821486-1.

Comments

    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the comments received.

Support for the Second SNPRM

    Boeing, the manufacturer, concurs with the content of the second 
SNPRM.

Request To Remove Airplanes From the Second SNPRM

    United Airlines (UAL) does not agree with the contents of the 
second SNPRM for the Model 747-400 series airplanes and feels that 
regulatory action is not necessary to ensure the intent of the second 
SNPRM for these airplanes. UAL states that it took immediate steps to 
comply with Boeing and Hamilton Sundstrand service bulletins specified 
in the second SNPRM. UAL notes that because the reliability of the 
humidifier was extremely poor at the time that the cell stack concern 
was identified, the humidifier cell stacks have been

[[Page 61392]]

replaced many times since the year 2000. UAL states that the removed 
cell stacks were sent to Hamilton Sundstrand for repair and 
modification and that Hamilton Sundstrand is the sole source for repair 
and modification. Therefore, UAL concludes that the intent of the 
second SNPRM for the 747-400 airplanes can be satisfied by examining 
Hamilton Sundstrand's maintenance records for the cell stack.
    We disagree. Regulatory action is necessary to ensure that Model 
747-400 series airplanes do the actions in this final rule. A review by 
the airplane manufacturer of the Hamilton Sundstrand records shows that 
about 10 defective humidifier cell stacks are in circulation among the 
Model 747-400 fleet. This final rule will prevent any of those 
humidifiers, having cell stack part number (P/N) 821482-1, from being 
installed as replacements on any airplanes unless ``DEV 13433'' is 
marked next to the cell stack P/N. We have not changed the final rule 
in this regard.
    UAL also does not agree with the contents of the second SNPRM for 
the Model 777-200 series airplanes and feels that regulatory action is 
not necessary to ensure the intent of the second SNPRM for these 
airplanes. UAL states that the airplanes identified as Group 6 in 
Boeing Service Bulletin 777-21A0048, Revision 3, dated May 12, 2006, 
were added to the service bulletin because the airplanes were scheduled 
to have the humidifiers retrofitted as part of the crew rest project; 
however, the installation was canceled and no airplanes were 
retrofitted with the humidifiers.
    We disagree. Regulatory action is necessary to ensure that Model 
777-200 series airplanes do the actions in this final rule. A review by 
the airplane manufacturer of the Hamilton Sundstrand records shows that 
about 14 defective humidifier cell stacks are in circulation among the 
Model 777 fleet. This final rule will prevent any of those humidifiers, 
having cell stack P/N 822976-2, from being installed as replacements on 
any airplanes unless ``DEV 13433'' is marked next to the cell stack P/
N. We have not changed the final rule in this regard.

Request To Allow Compliance With Maintenance Records

    UAL also requests that if Model 747-400 series airplanes are not 
allowed to be removed from the requirements of the second SNPRM as 
requested above, then the only regulatory actions imposed on operators 
should be limited to demonstrating compliance through their own 
maintenance records.
    We partially agree with the commenter. In paragraph (c) of this 
final rule we do allow a review of airplane maintenance records to 
determine the P/N of the flight deck humidifier instead of doing the 
inspection. We have determined that a review of the maintenance records 
is also acceptable if it can be determined that the flight deck 
humidifier is not installed. We have revised paragraph (c) to state 
that ``instead of inspecting the flight deck humidifier, a review of 
airplane maintenance records along with any other applicable data is 
acceptable if the P/N of the flight deck humidifier can be positively 
determined from that review or if it can be positively determined that 
the flight deck humidifier is not installed on the airplane.''

Request To Allow Equivalent Blanking Plate Installation

    UAL also requests that we consider the blanking plate installation 
and humidifier system deactivation done in accordance with Boeing 
Service Bulletin 777-21-0087, dated June 17, 2004; and Hamilton 
Sundstrand Service Bulletin 816086-21-01, dated March 15, 2000; as 
equivalent to the blanking plate installation done in accordance with 
Boeing Alert Service Bulletin 777-21A0048, Revision 2, dated July 14, 
2005 (specified in paragraph (f) of the second SNPRM).
    The commenter states that it has deactivated the humidifiers and 
replaced the cell stacks with blanking plates on all Group 7 airplanes 
identified in Boeing Alert Service Bulletin 777-21-0048, registration 
numbers 09UA and 16UA-29UA, by doing the actions in Boeing Service 
Bulletin 777-21-0087 and Hamilton Sundstrand Service Bulletin 816086-
21-01. The commenter also notes that the airplane having registration 
number 09UA, was delivered with a deactivated humidifier and only 
needed modification by doing the blanking plate installation per 
Hamilton Sundstrand Service Bulletin 816086-21-01.
    We agree with the commenter. We have revised paragraph (f)(2)(ii) 
of this final rule to give credit for airplanes on which the 
replacement and deactivation are done in accordance with Boeing Service 
Bulletin 777-21-0087 and Hamilton Sundstrand Service Bulletin 816086-
21-01 for those Group 7 airplanes listed in Boeing Service Bulletin 
777-21-0087, dated June 17, 2004.
    We have also determined that a review of the maintenance records is 
acceptable instead of the inspection specified in paragraph (f) of this 
final rule if it can be determined that the flight deck humidifier is 
not installed. We have revised paragraph (f) to state that ``instead of 
inspecting the flight deck humidifier, a review of airplane maintenance 
records along with any other applicable data is acceptable if the P/N 
of the flight deck humidifier can be positively determined from that 
review or if it can be positively determined that the flight deck 
humidifier is not installed on the airplane.''

Conclusion

    After careful review of the available data, including the comments 
noted above, the FAA has determined that air safety and the public 
interest require the adoption of the rule with the changes described 
previously. The FAA has determined that these changes will neither 
increase the economic burden on any operator nor increase the scope of 
the AD.

Cost Impact

    There are approximately 176 airplanes of the affected design in the 
worldwide fleet. The FAA estimates that this AD affects 29 airplanes of 
U.S. registry. The cost per airplane ranges between $390 and $6,248 per 
airplane, depending on the actions chosen by the operator. The fleet 
cost estimate does not exceed $181,192.

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                        Work    Hourly                 Cost per
             Model/series                          Action              hours     rate    Parts cost    airplane
----------------------------------------------------------------------------------------------------------------
747-400, 777-200, 777-300............  Inspect flight deck                  1      $65           $0          $65
                                        humidifier for P/N and
                                        inspect flight deck
                                        humidifier cell stack for P/
                                        N.
747-400..............................  Replace cell stack with new          3       65        5,100        5,295
                                        or supplier-tested cell
                                        stack.
747-400..............................  Replace cell stack with              5       65            0          325
                                        blanking plate and
                                        deactivate humidifier.
777-200, 777-300.....................  Replace cell stack with              3       65            0          195
                                        blanking plate.

[[Page 61393]]

 
777-200, 777-300.....................  Replace cell stack with new          3       65        6,053        6,248
                                        or supplier-tested cell
                                        stack.
777-200, 777-300.....................  Replace blanking plate with          1       65        6,053        6,118
                                        supplier-tested cell stack.
----------------------------------------------------------------------------------------------------------------

    The cost impact figures discussed above are based on assumptions 
that no operator has yet accomplished any of the requirements of this 
AD action, and that no operator would accomplish those actions in the 
future if this AD were not adopted. The cost impact figures discussed 
in AD rulemaking actions represent only the time necessary to perform 
the specific actions actually required by the AD. These figures 
typically do not include incidental costs, such as the time required to 
gain access and close up, planning time, or time necessitated by other 
administrative actions.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, Section 106, describes the 
authority of the FAA Administrator. Subtitle VII, Aviation Programs, 
describes in more detail the scope of the Agency's authority.
    We are issuing this rulemaking under the authority described in 
Subtitle VII, Part A, Subpart III, Section 44701, ``General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Impact

    The regulations adopted herein will not have a substantial direct 
effect on the States, on the relationship between the national 
Government and the States, or on the distribution of power and 
responsibilities among the various levels of government. Therefore, it 
is determined that this final rule does not have federalism 
implications under Executive Order 13132.
    For the reasons discussed above, I certify that this action (1) is 
not a ``significant regulatory action'' under Executive Order 12866; 
(2) is not a ``significant rule'' under DOT Regulatory Policies and 
Procedures (44 FR 11034, February 26, 1979); and (3) will not have a 
significant economic impact, positive or negative, on a substantial 
number of small entities under the criteria of the Regulatory 
Flexibility Act. A final evaluation has been prepared for this action 
and it is contained in the Rules Docket. A copy of it may be obtained 
from the Rules Docket at the location provided under the caption 
ADDRESSES.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

0
Accordingly, pursuant to the authority delegated to me by the 
Administrator, the Federal Aviation Administration amends part 39 of 
the Federal Aviation Regulations (14 CFR part 39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.


Sec.  39.13  [Amended]

0
2. Section 39.13 is amended by adding the following new airworthiness 
directive:

2006-21-05 Boeing: Amendment 39-14789. Docket 2000-NM-360-AD.

    Applicability: Model 747-400, 777-200, and 777-300 series 
airplanes, certificated in any category; as identified in Boeing 
Service Bulletin 747-21A2414, Revision 3, dated May 12, 2006; and 
Boeing Service Bulletin 777-21A0048, Revision 3, dated May 12, 2006.
    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent an increased pressure drop across the humidifier and 
consequent reduced airflow to the flight deck, which could result in 
the inability to clear any smoke that might appear in the flight 
deck, accomplish the following:

Cell Stack Replacement: Model 747-400 Series Airplanes

    (a) For Model 747-400 series airplanes identified as Group 1 in 
Boeing Service Bulletin 747-21A2414, Revision 3, dated May 12, 2006: 
Within 90 days after the effective date of this AD, do the 
replacement specified in paragraph (a)(1) or (a)(2) of this AD. For 
flight deck humidifiers with a blanking plate: If the blanking plate 
is removed and a new or supplier-tested cell stack is installed, the 
replacement must be done in accordance with the Accomplishment 
Instructions of Hamilton Sundstrand Service Bulletins 821486-21-01, 
dated March 15, 2000; and after the replacement, the flight deck 
humidifier may be activated in accordance with the Accomplishment 
Instructions of Boeing Service Bulletin 747-21-2405, Revision 4, 
dated July 29, 1999.

    Note 1: Boeing Service Bulletin 747-21A2414, Revision 3, dated 
May 12, 2006, specifies Group 1 as ``all 747-400 airplanes with 
Hamilton Sundstrand flight deck humidifier 821486-01.'' The correct 
part number (P/N) for the humidifier is 821486-1.

    (1) Replace the cell stack of the flight deck humidifier with a 
supplier-tested cell stack, in accordance with Part 1 of the 
Accomplishment Instructions of Boeing Service Bulletin 747-21A2414, 
Revision 3, dated May 12, 2006.
    (2) Replace the cell stack of the flight deck humidifier with a 
blanking plate and, before further flight, deactivate the flight 
deck humidifier, in accordance with Part 2 of the Accomplishment 
Instructions of Boeing Service Bulletin 747-21A2414, Revision 3, 
dated May 12, 2006.

    Note 2: Boeing Service Bulletin 747-21A2414, Revision 3, dated 
May 12, 2006, refers to Boeing Service Bulletin 747-21-2405, 
Revision 4, dated July 29, 1999, as an additional source of service 
information for deactivating the humidifier.


    Note 3: Boeing Service Bulletin 747-21A2414, Revision 3, dated 
May 12, 2006, refers to Hamilton Sundstrand Service Bulletin 821486-
21-01, dated March 15, 2000, as an additional source of service 
information for the cell stack replacements.

    (b) Replacement of the cell stack before the effective date of 
this AD in accordance with Boeing Alert Service Bulletin 747-
21A2414, dated April 13, 2000; Revision 1, dated October 26, 2000; 
or Revision 2, dated July 7, 2005; is acceptable for compliance with 
the applicable requirements of paragraphs (a)(1) and (a)(2) of this 
AD.

Inspections/Records Review: Model 747-400 Series Airplanes

    (c) For Model 747-400 series airplanes identified as Groups 2 
and 3 in Boeing Service Bulletin 747-21A2414, Revision 3, dated May 
12, 2006: Within 90 days after the effective date of this AD, 
inspect the flight deck humidifier to determine whether P/N 821486-1 
is installed, in accordance with Part 3 of the Accomplishment 
Instructions of Boeing Service Bulletin 747-21A2414, Revision 3, 
dated May 12, 2006. Instead of inspecting the flight deck 
humidifier, a

[[Page 61394]]

review of airplane maintenance records along with any other 
applicable data is acceptable if the P/N of the flight deck 
humidifier can be positively determined from that review or if it 
can be positively determined that the flight deck humidifier is not 
installed on the airplane.
    (1) If a P/N other than P/N 821486-1 is installed or if the 
flight deck humidifier is not installed, no further action is 
required by this paragraph.
    (2) If P/N 821486-1 is installed, inspect the flight deck 
humidifier cell stack to determine whether P/N 821482-1 is installed 
and ``DEV 13433'' is not marked next to the cell stack P/N, in 
accordance with Part 3 of the Accomplishment Instructions of the 
service bulletin. Instead of inspecting the flight deck humidifier 
cell stack, a review of airplane maintenance records is acceptable 
if the P/N, including whether ``DEV 13433'' is marked next to the P/
N, of the flight deck humidifier cell stack can be positively 
determined from that review.
    (i) If the cell stack has P/N 821482-2 or 1003111-2, or if ``DEV 
13433'' is marked next to P/N 821482-1, no further action is 
required by this paragraph.
    (ii) If the cell stack has P/N 821482-1 and does not have ``DEV 
13433'' marked next to the cell stack P/N: Before further flight, do 
the replacement specified in paragraph (a) of this AD.

Cell Stack Replacement: Model 777-200 and -300 Series Airplanes

    (d) For Model 777-200 and 777-300 series airplanes identified as 
Groups 1 through 5 in Boeing Service Bulletin 777-21A0048, Revision 
3, dated May 12, 2006: Within 90 days after the effective date of 
this AD, do the replacement specified in paragraph (d)(1) or (d)(2) 
of this AD. For flight deck humidifiers with a blanking plate: If a 
blanking plate is removed and a new or supplier-tested cell stack 
installed, the cell stack installation must be done in accordance 
with Part 3 of the Accomplishment Instructions of Boeing Service 
Bulletin 777-21A0048, Revision 3, dated May 12, 2006; and after the 
installation, the humidifier system may be activated in accordance 
with Accomplishment Instructions of Boeing Service Bulletin 777-21-
0035, Revision 1, dated October 19, 2000.
    (1) Replace the cell stack with a blanking plate, in accordance 
with Part 1 of the Accomplishment Instructions of Boeing Service 
Bulletin 777-21A0048, Revision 3, dated May 12, 2006; and, before 
further flight, deactivate the humidifier system in accordance with 
a method approved by the Manager, Seattle Aircraft Certification 
Office (ACO), FAA, or in accordance with data meeting the 
certification basis of the airplane approved by an Authorized 
Representative for the Boeing Commercial Airplanes Delegation Option 
Authorization who has been authorized by the Manager, Seattle ACO, 
to make those findings. For a deactivation method to be approved, 
the deactivation must meet the certification basis of the airplane, 
and the approval must specifically reference this AD.
    (2) Replace the cell stack with a supplier-tested cell stack, in 
accordance with Part 2 of the Accomplishment Instructions of Boeing 
Service Bulletin 777-21A0048, Revision 3, dated May 12, 2006.

    Note 4: Boeing Service Bulletin 777-21A0048, Revision 3, dated 
May 12, 2006, refers to Hamilton Sundstrand Service Bulletin 816086-
21-01, dated March 15, 2000, as an additional source of service 
information for the cell stack replacement.

    (e) Replacement of the cell stack before the effective date of 
this AD in accordance with Boeing Service Bulletin 777-21A0048, 
Revision 1, dated September 7, 2000; or Boeing Alert Service 
Bulletin 777-21A0048, Revision 2, dated July 14, 2005; is acceptable 
for compliance with the applicable requirements of paragraphs (d)(1) 
and (d)(2) of this AD.

Inspections/Records Review: Model 777-200 and -300 Series Airplanes

    (f) For Model 777-200 and 777-300 series airplanes identified as 
Groups 6 and 7 in Boeing Service Bulletin 777-21A0048, Revision 3, 
dated May 12, 2006: Within 90 days after the effective date of this 
AD, inspect the flight deck humidifier to determine if it is P/N 
816086-1, in accordance with Part 4 of the Accomplishment 
Instructions of Boeing Service Bulletin 777-21A0048, Revision 3, 
dated May 12, 2006. Instead of inspecting the flight deck 
humidifier, a review of airplane maintenance records along with any 
other applicable data is acceptable if the P/N of the flight deck 
humidifier can be positively determined from that review or if it 
can be positively determined that the flight deck humidifier is not 
installed on the airplane.
    (1) If a P/N other than P/N 816086-1 is installed or if the 
flight deck humidifier is not installed, no further action is 
required by this paragraph.
    (2) If P/N 816086-1 is installed, inspect the flight deck 
humidifier cell stack to determine whether P/N 822976-2 is installed 
and ``DEV 13433'' is not marked next to the cell stack P/N, in 
accordance with Part 4 of the Accomplishment Instructions of the 
service bulletin. Instead of inspecting the flight deck humidifier 
cell stack, a review of airplane maintenance records is acceptable 
if the P/N, including whether ``DEV 13433'' is marked next to the P/
N, of the flight deck humidifier cell stack can be positively 
determined from that review.
    (i) If the cell stack has P/N 822976-3 or 1003111-1, or if ``DEV 
13433'' is marked next to P/N 822976-2, no further action is 
required by this paragraph.
    (ii) If the cell stack has P/N 822976-2 and does not have ``DEV 
13433'' marked next to the cell stack P/N, before further flight, do 
the replacement specified in paragraph (d) of this AD. Doing the 
replacement of the cell stack with a blanking plate, in accordance 
with paragraph 3.A. of the Accomplishment Instructions of Hamilton 
Sundstrand Service Bulletin 816086-21-01, dated March 15, 2000; and 
the deactivation of the humidifier system, in accordance with the 
Accomplishment Instructions of Boeing Service Bulletin 777-21-0087, 
dated June 17, 2004; is acceptable for compliance with paragraph 
(d)(1) of this AD for those Group 7 airplanes listed in Boeing 
Service Bulletin 777-21-0087, dated June 17, 2004.

Actions Accomplished According to Previous Issue of Service Bulletin

    (g) Inspections accomplished before the effective date of this 
AD in accordance with Boeing Alert Service Bulletin 747-21A2414, 
Revision 2, dated July 7, 2005, are considered acceptable for 
compliance with the corresponding action specified in paragraph (c) 
of this AD.
    (h) Inspections accomplished before the effective date of this 
AD in accordance with Boeing Alert Service Bulletin 777-21A0048, 
Revision 2, dated July 14, 2005, are considered acceptable for 
compliance with the corresponding action specified in paragraph (f) 
of this AD.

Parts Installation

    (i) On Model 747-400 series airplanes: As of the effective date 
of this AD, no person may install a flight deck humidifier cell 
stack having P/N 821482-1, unless ``DEV 13433'' is also marked next 
to the cell stack P/N.
    (j) On Model 777-200 and 777-300 series airplanes: As of the 
effective date of this AD, no person may install a flight deck 
humidifier cell stack having P/N 822976-2, unless ``DEV 13433'' is 
also marked next to the cell stack P/N.

Alternative Methods of Compliance

    (k)(1) In accordance with 14 CFR 39.19, the Manager, Seattle 
ACO, is authorized to approve alternative methods of compliance for 
this AD.
    (2) Before using any AMOC approved in accordance with 14 CFR 
39.19 on any airplane to which the AMOC applies, notify the 
appropriate principal inspector in the FAA Flight Standards 
Certificate Holding District Office.

Incorporation by Reference

    (l) Unless otherwise specified in this AD, the actions must be 
done in accordance with the applicable service bulletins listed in 
Table 1 of this AD. This incorporation by reference was approved by 
the Director of the Federal Register in accordance with 5 U.S.C. 
552(a) and 1 CFR part 51. To get copies of this service information, 
contact Boeing Commercial Airplanes, P.O. Box 3707, Seattle, 
Washington 98124-2207. To inspect copies of this service 
information, go to the FAA, Transport Airplane Directorate, 1601 
Lind Avenue, SW., Renton, Washington. For information on the 
availability of this material at the NARA, call (202) 741-6030, or 
go to https://www.archives.gov/federal_register/code_of_federal_
regulations/ibr_locations.html. 

[[Page 61395]]



                                  Table 1.--Material Incorporated by Reference
----------------------------------------------------------------------------------------------------------------
           Service Bulletin                     Revision level                            Date
----------------------------------------------------------------------------------------------------------------
Boeing Service Bulletin 747-21A2414...  3.............................  May 12, 2006.
Boeing Service Bulletin 747-21-2405...  4.............................  July 29, 1999.
Boeing Service Bulletin 777-21A0048...  3.............................  May 12, 2006.
Boeing Service Bulletin 777-21-0035...  1.............................  October 19, 2000.
Boeing Service Bulletin 777-21-0087...  Original......................  June 17, 2004.
Hamilton Sundstrand Service Bulletin    Original......................  March 15, 2000.
 816086-21-01.
Hamilton Sundstrand Service Bulletin    Original......................  March 15, 2000.
 821486-21-01.
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Effective Date

    (m) This amendment becomes effective on November 22, 2006.

    Issued in Renton, Washington, on October 6, 2006.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E6-17187 Filed 10-17-06; 8:45 am]
BILLING CODE 4910-13-P