Airworthiness Directives; The Boeing Company Model 777-200, -200LR, -300, and -300ER Series Airplanes, 81508-81512 [2010-32657]

Download as PDF 81508 Proposed Rules Federal Register Vol. 75, No. 248 Tuesday, December 28, 2010 This section of the FEDERAL REGISTER contains notices to the public of the proposed issuance of rules and regulations. The purpose of these notices is to give interested persons an opportunity to participate in the rule making prior to the adoption of the final rules. DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2010–1205; Directorate Identifier 2010–NM–146–AD] RIN 2120–AA64 Airworthiness Directives; The Boeing Company Model 777–200, –200LR, –300, and –300ER Series Airplanes Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: We propose to adopt a new airworthiness directive (AD) for certain Model 777–200, –200LR, –300, and –300ER series airplanes. This proposed AD would require, for certain airplanes, replacing certain boost pump relays with ground fault interrupter (GFI) relays. For certain other airplanes, this proposed AD would require installing new panels in the main equipment center, making certain wiring changes, installing new GFI relays in the new panels, and installing new electrical load management system (ELMS) software. For certain other airplanes, this proposed AD would require doing certain bond resistance measurements, and corrective actions if necessary. This proposed AD results from fuel system reviews conducted by the manufacturer. We are proposing this AD to prevent the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane. DATES: We must receive comments on this proposed AD by February 11, 2011. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, emcdonald on DSK2BSOYB1PROD with PROPOSALS SUMMARY: VerDate Mar<15>2010 17:55 Dec 27, 2010 Jkt 223001 M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M–30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For Boeing service information identified in this proposed AD, contact Boeing Commercial Airplanes, Attention: Data & Services Management, P.O. Box 3707, MC 2H–65, Seattle, Washington 98124–2207; telephone 206–544–5000, extension 1; fax 206– 766–5680; e-mail me.boecom@boeing.com; Internet https://www.myboeingfleet.com. For Smiths and GE Aviation service information identified in this proposed AD, contact GE Aviation, Customer Services—Clearwater, P.O. Box 9013, Clearwater, Florida 33758; telephone 727–539–1631; fax 727–539–0680; e-mail cs.support@ge.com. You may review copies of the referenced service information at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington. For information on the availability of this material at the FAA, call 425–227–1221. Examining the AD Docket You may examine the AD docket on the Internet at http:// www.regulations.gov; or in person at the Docket Management Facility between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this proposed AD, the regulatory evaluation, any comments received, and other information. The street address for the Docket Office (telephone 800–647–5527) is in the ADDRESSES section. Comments will be available in the AD docket shortly after receipt. FOR FURTHER INFORMATION CONTACT: Georgios Roussos, Aerospace Engineer, Systems and Equipment Branch, ANM– 130S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (425) 917–6482; fax (425) 917–6590. SUPPLEMENTARY INFORMATION: Comments Invited We invite you to send any written relevant data, views, or arguments about PO 00000 Frm 00001 Fmt 4702 Sfmt 4702 this proposed AD. Send your comments to an address listed under the ADDRESSES section. Include ‘‘Docket No. FAA–2010–1205; Directorate Identifier 2010–NM–146–AD’’ at the beginning of your comments. We specifically invite comments on the overall regulatory, economic, environmental, and energy aspects of this proposed AD. We will consider all comments received by the closing date and may amend this proposed AD because of those comments. We will post all comments we receive, without change, to http:// www.regulations.gov, including any personal information you provide. We will also post a report summarizing each substantive verbal contact we receive about this proposed AD. Discussion The FAA has examined the underlying safety issues involved in fuel tank explosions on several large transport airplanes, including the adequacy of existing regulations, the service history of airplanes subject to those regulations, and existing maintenance practices for fuel tank systems. As a result of those findings, we issued a regulation titled ‘‘Transport Airplane Fuel Tank System Design Review, Flammability Reduction and Maintenance and Inspection Requirements’’ (66 FR 23086, May 7, 2001). In addition to new airworthiness standards for transport airplanes and new maintenance requirements, this rule included Special Federal Aviation Regulation No. 88 (‘‘SFAR 88,’’ Amendment 21–78, and subsequent Amendments 21–82 and 21–83). Among other actions, SFAR 88 requires certain type design (i.e., type certificate (TC) and supplemental type certificate (STC)) holders to substantiate that their fuel tank systems can prevent ignition sources in the fuel tanks. This requirement applies to type design holders for large turbine-powered transport airplanes and for subsequent modifications to those airplanes. It requires them to perform design reviews and to develop design changes and maintenance procedures if their designs do not meet the new fuel tank safety standards. As explained in the preamble to the rule, we intended to adopt airworthiness directives to mandate any changes found necessary to address E:\FR\FM\28DEP1.SGM 28DEP1 Federal Register / Vol. 75, No. 248 / Tuesday, December 28, 2010 / Proposed Rules unsafe conditions identified as a result of these reviews. In evaluating these design reviews, we have established four criteria intended to define the unsafe conditions associated with fuel tank systems that require corrective actions. The percentage of operating time during which fuel tanks are exposed to flammable conditions is one of these criteria. The other three criteria address the failure types under evaluation: single failures, single failures in combination with a latent condition(s), and in-service failure experience. For all four criteria, the evaluations included consideration of previous actions taken that may mitigate the need for further action. We have determined that the actions identified in this AD are necessary to reduce the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane. As part of the SFAR 88 analysis, Boeing found indications of wiring deterioration that could cause electrical faults in the main tank boost pumps, main tank jettison pumps, or center tank override/jettison pumps could result in an overheat or electrical arc condition that could provide an ignition source in the fuel tanks. Also, uncommanded dry operation of the main tank jettison pumps or the center tank override/ jettison pumps could result from electrical faults or a single failure in the pump switch or the electrical load control unit (ELCU). Extended dry operation of the pump could cause an overheat condition, electrical arc, or frictional sparks, providing an ignition source in the fuel tanks. These ignition sources, in combination with flammable 81509 fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane. Relevant Service Information We have reviewed Boeing Service Bulletin 777–28A0038, Revision 1, dated September 20, 2010. That service bulletin describes procedures for replacing 4 main tank boost pump relays in electrical load management system (ELMS) panels P110, P210, and P320, with new ground fault interrupter (GFI) relays. Boeing Service Bulletin 777– 28A0038, Revision 1, dated September 20, 2010, references the service bulletins identified in the following table as additional sources of guidance for replacing the main tank boost pump relays. TABLE—SERVICE BULLETINS FOR BOEING SERVICE BULLETIN 777–28A0038 Revision level GE Aviation Service Bulletin 4000ELM–28– 448. GE Aviation Service Bulletin 4000ELM–28– 451. GE Aviation Service Bulletin 5000ELM–28– 446. GE Aviation Service Bulletin 5000ELM–28– 449. Smiths Service Bulletin 4000ELM–28–445 .... Smiths Service Bulletin 4000ELM–28–465 .... Smiths Service Bulletin 5000ELM–28–443 .... Smiths Service Bulletin 5000ELM–28–463 .... Smiths Service Bulletin 6000ELM–28–444 .... Smiths Service Bulletin 6000ELM–28–447 .... Smiths Service Bulletin 6000ELM–28–450 .... Smiths Service Bulletin 6000ELM–28–464 .... emcdonald on DSK2BSOYB1PROD with PROPOSALS Service bulletin 1 .......................................................... January 7, 2010. 1 .......................................................... January 7, 2010. 1 .......................................................... January 7, 2010. 1 .......................................................... January 7, 2010. Original Original Original Original Original Original Original Original August August August August August August August August We have also reviewed Boeing Service Bulletin 777–28A0037, Revision 2, dated September 20, 2010. That service bulletin describes procedures for certain airplanes, for installing new panels, P301 and P302, in the main equipment center; making certain wiring changes; installing new GFI relays in the P301 and P302 panels; and installing new ELMS software. For certain airplanes, that service bulletin describes procedures for measuring the bond resistance between the terminal lugs on certain studs and a ground bracket assembly, and corrective action if necessary. The corrective actions include repairing (cleaning of applicable components with solvent) or replacing VerDate Mar<15>2010 17:55 Dec 27, 2010 Jkt 223001 Date ............................................... ............................................... ............................................... ............................................... ............................................... ............................................... ............................................... ............................................... (replacing applicable components with new components) affected components. Boeing Service Bulletin 777– 28A0039, Revision 2, dated September 20, 2010, is an additional source of guidance for installing ELMS software. Smiths Service Bulletin 5000ELM– 28–454, dated August 13, 2007; and GE Aviation Service Bulletin 6000ELM–28– 455, Revision 1, dated February 1, 2010; are additional sources of guidance for making wiring changes in the P110 and P210 panels. FAA’s Determination and Requirements of This Proposed AD 8, 8, 8, 8, 8, 8, 8, 8, 2007. 2007. 2007. 2007. 2007. 2007. 2007. 2007. determined the unsafe condition described previously is likely to exist or develop in other products of the same type design. This proposed AD would require accomplishing the actions specified in the service information described previously. Costs of Compliance We estimate that this proposed AD would affect 130 airplanes of U.S. registry. The following table provides the estimated costs for U.S. operators to comply with this proposed AD. We are proposing this AD because we evaluated all relevant information and PO 00000 Frm 00002 Fmt 4702 Sfmt 4702 E:\FR\FM\28DEP1.SGM 28DEP1 VerDate Mar<15>2010 Replacements: Group 1 airplanes identified in Boeing Service Bulletin 777–28A0038. Replacements: Group 2 airplanes identified in Boeing Service Bulletin 777–28A0038. Replacements: Group 3 airplanes identified in Boeing Service Bulletin 777–28A0038. Replacements: Group 4 airplanes identified in Boeing Service Bulletin 777–28A0038. Installations and Measurement: Boeing Service Bulletin 777– 28A0037. Action emcdonald on DSK2BSOYB1PROD with PROPOSALS Work hours 17:55 Dec 27, 2010 85 4 Jkt 223001 76 85 85 85 3 4 $85 3 Average labor rate per hour Parts 29,934 17,816 37,257 52,545 $25,577 TABLE—ESTIMATED COSTS 36,394 18,156 37,597 52,800 $25,832 Cost per product 130 0 4 0 126 Number of U.S.-registered airplanes 4,731,220. No airplanes currently on U.S. Register. 150,388. No airplanes currently on U.S. Register. $3,254,832. Fleet cost 81510 Federal Register / Vol. 75, No. 248 / Tuesday, December 28, 2010 / Proposed Rules PO 00000 Frm 00003 Fmt 4702 Sfmt 4702 E:\FR\FM\28DEP1.SGM 28DEP1 Federal Register / Vol. 75, No. 248 / Tuesday, December 28, 2010 / Proposed 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 Findings We determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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. For the reasons discussed above, I certify this proposed regulation: 1. Is not a ‘‘significant regulatory action’’ under Executive Order 12866, 2. Is not a ‘‘significant rule’’ under the 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. You can find our regulatory evaluation and the estimated costs of compliance in the AD Docket. List of Subjects in 14 CFR Part 39 emcdonald on DSK2BSOYB1PROD with PROPOSALS Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety. The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows: section of the Instructions for Continued Airworthiness to include limitations for the fuel tank systems. One of the limitations, AWL 28–AWL–18, requires a repetitive inspection of the ground fault interrupter (GFI) functions. PART 39—AIRWORTHINESS DIRECTIVES Installations and Software Changes (g) For Group 1 and 2 airplanes identified as Configuration 2 in Boeing Service Bulletin 777–28A0037, Revision 2, dated September 20, 2010: Within 36 months after the effective date of this AD, install new panels, P301 and P302, in the main equipment center; make certain wiring changes; install new GFI relays in the P301 and P302 panels; and install new electrical load management system (ELMS) software; as applicable. Do the applicable actions in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777–28A0037, Revision 2, dated September 20, 2010. Note 2: Boeing Service Bulletin 777– 28A0039, Revision 2, dated September 20, 2010, is an additional source of guidance for installing ELMS software. 1. The authority citation for part 39 continues to read as follows: Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new AD: The Boeing Company: Docket No. FAA– 2010–1205; Directorate Identifier 2010– NM–146–AD. Comments Due Date (a) We must receive comments by February 11, 2011. Affected ADs (b) AD 2008–11–13, Amendment 39–15536, affects this AD. Applicability (c) This AD applies to The Boeing Company Model 777–200, –200LR, –300, and –300ER series airplanes, certificated in any category; as identified in the service information specified in paragraphs (c)(1) and (c)(2) of this AD. (1) Boeing Service Bulletin 777–28A0038, Revision 1, dated September 20, 2010. (2) Boeing Service Bulletin 777–28A0037, Revision 2, dated September 20, 2010. Subject (d) Air Transport Association (ATA) of America Code 28: Fuel. Unsafe Condition (e) This AD results from fuel system reviews conducted by the manufacturer. The Federal Aviation Administration is issuing this AD to prevent the potential of ignition sources inside fuel tanks, which, in combination with flammable fuel vapors, could result in a fuel tank explosion and consequent loss of the airplane. Compliance (f) You are responsible for having the actions required by this AD performed within the compliance times specified, unless the actions have already been done. Related Airworthiness Limitation Note 1: AD 2008–11–13 requires a revision of the Airworthiness Limitations (AWLs) Note 3: Smiths Service Bulletin 5000ELM– 28–454, dated August 13, 2007; and GE Aviation Service Bulletin 6000ELM–28–455, Revision 1, dated February 1, 2010; are additional sources of guidance for making a wiring change in the P110 and P210 panels, respectively. (h) For Group 1 and 2 airplanes identified as Configuration 1 in Boeing Service Bulletin 777–28A0037, Revision 2, dated September 20, 2010: Within 36 months after the effective date of this AD, do bonding resistance measurements to verify bonding requirements as specified in Boeing Service Bulletin 777–28A0037, Revision 2, dated September 20, 2010, are met, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777–28A0037, Revision 2, dated September 20, 2010. Replacement of GFI Relays (i) For airplanes identified in Boeing Service Bulletin 777–28A0038, Revision 1, dated September 20, 2010: Within 60 months after the effective date of this AD, replace 4 main tank boost pump relays in electrical load management system panels P110, P210, and P320 with new GFI relays, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777–28A0038, Revision 1, dated September 20, 2010. Note 4: Boeing Service Bulletin 777– 28A0038, Revision 1, dated September 20, 2010, references the service bulletins identified in Table 1 of this AD as additional sources of guidance for replacing the main tank boost pump relays. TABLE 1—ADDITIONAL SOURCES OF GUIDANCE FOR REPLACING THE MAIN TANK BOOST PUMP RELAYS Group No. of airplanes, as identified in Boeing Service Bulletin 777–28A0038, Revision 1, dated September 20, 2010 Panel No. Group 1 ............................... P110 VerDate Mar<15>2010 17:55 Dec 27, 2010 Jkt 223001 81511 Service bulletin Smiths Service 5000ELM–28–443. PO 00000 Frm 00004 Revision level Bulletin Fmt 4702 Original .............................. Sfmt 4702 E:\FR\FM\28DEP1.SGM Date August 8, 2007. 28DEP1 81512 Federal Register / Vol. 75, No. 248 / Tuesday, December 28, 2010 / Proposed Rules TABLE 1—ADDITIONAL SOURCES OF GUIDANCE FOR REPLACING THE MAIN TANK BOOST PUMP RELAYS—Continued Group No. of airplanes, as identified in Boeing Service Bulletin 777–28A0038, Revision 1, dated September 20, 2010 Panel No. Group 1 ............................... P210 Group 1 ............................... P320 Group 2 ............................... P110 Group 2 ............................... P210 Group 2 ............................... P320 Group 3 ............................... P110 Group 3 ............................... P210 Group 3 ............................... P320 Group 4 ............................... P110 Group 4 ............................... P210 Group 4 ............................... P320 Service bulletin Smiths Service 6000ELM–28–444. Smiths Service 4000ELM–28–445. GE Aviation Service 5000ELM–28–446. Smiths Service 6000ELM–28–447. GE Aviation Service 4000ELM–28–448. GE Aviation Service 5000ELM–28–449. Smiths Service 6000ELM–28–450. GE Aviation Service 4000ELM–28–451. Smiths Service 5000ELM–28–463. Smiths Service 6000ELM–28–464. Smiths Service 4000ELM–28–465. Revision level Bulletin Original .............................. August 8, 2007. Bulletin Original .............................. August 8, 2007. Bulletin 1 ........................................ January 7, 2010. Bulletin Original .............................. August 8, 2007. Bulletin 1 ........................................ January 7, 2010. Bulletin 1 ........................................ January 7, 2010. Bulletin Original .............................. August 8, 2007. Bulletin 1 ........................................ January 7, 2010. Bulletin Original .............................. August 8, 2007. Bulletin Original .............................. August 8, 2007. Bulletin Original .............................. August 8, 2007. emcdonald on DSK2BSOYB1PROD with PROPOSALS Paperwork Reduction Act Burden Statement (j) A federal agency may not conduct or sponsor, and a person is not required to respond to, nor shall a person be subject to a penalty for failure to comply with a collection of information subject to the requirements of the Paperwork Reduction Act unless that collection of information displays a current valid OMB Control Number. The OMB Control Number for this information collection is 2120–0056. Public reporting for this collection of information is estimated to be approximately 5 minutes per response, including the time for reviewing instructions, completing and reviewing the collection of information. All responses to this collection of information are mandatory. Comments concerning the accuracy of this burden and suggestions for reducing the burden should be directed to the FAA at: 800 Independence Ave., SW., Washington, DC 20591, Attn: Information Collection Clearance Officer, AES–200. (PMI) or principal avionics inspector (PAI), as appropriate, or lacking a principal inspector, your local Flight Standards District Office. The AMOC approval letter must specifically reference this AD. Issued in Renton, Washington, on December 17, 2010. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. Alternative Methods of Compliance (AMOCs) (k)(1) The Manager, Seattle Aircraft Certification Office, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. Send information to Attn: Georgios Roussos, Aerospace Engineer, Systems and Equipment Branch, ANM–130S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (425) 917–6482; fax (425) 917–6590. Information may be e-mailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. (2) To request a different method of compliance or a different compliance time for this AD, follow the procedures in 14 CFR 39.19. Before using any approved AMOC on any airplane to which the AMOC applies, notify your principal maintenance inspector RIN 2120–AA64 VerDate Mar<15>2010 17:55 Dec 27, 2010 Jkt 223001 [FR Doc. 2010–32657 Filed 12–27–10; 8:45 am] BILLING CODE 4910–13–P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2010–1204; Directorate Identifier 2010–NM–147–AD] Airworthiness Directives; Various Aviation Communication & Surveillance Systems (ACSS) Traffic Alert and Collision Avoidance System (TCAS) Units Federal Aviation Administration (FAA), DOT. ACTION: Notice of proposed rulemaking (NPRM). AGENCY: We propose to adopt a new airworthiness directive (AD) for various aircraft equipped with certain ACSS TCAS units. This proposed AD would require upgrading software. This proposed AD results from reports of SUMMARY: PO 00000 Frm 00005 Date Fmt 4702 Sfmt 4702 anomalies with TCAS units during a flight test over a high density airport. The TCAS units dropped several reduced surveillance aircraft tracks because of interference limiting. We are proposing this AD to prevent TCAS units from dropping tracks, which could compromise separation of air traffic and lead to subsequent mid-air collisions. DATES: We must receive comments on this proposed AD by February 11, 2011. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments. • Fax: 202–493–2251. • Mail: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590. • Hand Delivery: U.S. Department of Transportation, Docket Operations, M– 30, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. For service information identified in this proposed AD, contact Aviation Communication & Surveillance Systems, LLC, 19810 North 7th Avenue, Phoenix, Arizona 85027–4741; telephone (623) 445–7040; fax (623) 445–7004; e-mail acss.orderadmin@L3com.com; Internet http:// www.acss.com. You may review copies of the referenced service information at E:\FR\FM\28DEP1.SGM 28DEP1

Agencies

[Federal Register Volume 75, Number 248 (Tuesday, December 28, 2010)]
[Proposed Rules]
[Pages 81508-81512]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-32657]


========================================================================
Proposed Rules
                                                Federal Register
________________________________________________________________________

This section of the FEDERAL REGISTER contains notices to the public of 
the proposed issuance of rules and regulations. The purpose of these 
notices is to give interested persons an opportunity to participate in 
the rule making prior to the adoption of the final rules.

========================================================================


Federal Register / Vol. 75, No. 248 / Tuesday, December 28, 2010 / 
Proposed Rules

[[Page 81508]]



DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-1205; Directorate Identifier 2010-NM-146-AD]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Model 777-200, -
200LR, -300, and -300ER Series Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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

SUMMARY: We propose to adopt a new airworthiness directive (AD) for 
certain Model 777-200, -200LR, -300, and -300ER series airplanes. This 
proposed AD would require, for certain airplanes, replacing certain 
boost pump relays with ground fault interrupter (GFI) relays. For 
certain other airplanes, this proposed AD would require installing new 
panels in the main equipment center, making certain wiring changes, 
installing new GFI relays in the new panels, and installing new 
electrical load management system (ELMS) software. For certain other 
airplanes, this proposed AD would require doing certain bond resistance 
measurements, and corrective actions if necessary. This proposed AD 
results from fuel system reviews conducted by the manufacturer. We are 
proposing this AD to prevent the potential of ignition sources inside 
fuel tanks, which, in combination with flammable fuel vapors, could 
result in a fuel tank explosion and consequent loss of the airplane.

DATES: We must receive comments on this proposed AD by February 11, 
2011.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
     Fax: 202-493-2251.
     Mail: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590.
     Hand Delivery: U.S. Department of Transportation, Docket 
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New 
Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays.
    For Boeing service information identified in this proposed AD, 
contact Boeing Commercial Airplanes, Attention: Data & Services 
Management, P.O. Box 3707, MC 2H-65, Seattle, Washington 98124-2207; 
telephone 206-544-5000, extension 1; fax 206-766-5680; e-mail 
me.boecom@boeing.com; Internet https://www.myboeingfleet.com.
    For Smiths and GE Aviation service information identified in this 
proposed AD, contact GE Aviation, Customer Services--Clearwater, P.O. 
Box 9013, Clearwater, Florida 33758; telephone 727-539-1631; fax 727-
539-0680; e-mail cs.support@ge.com.
    You may review copies of the referenced service information at the 
FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington. For information on the availability of this material at the 
FAA, call 425-227-1221.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at the Docket Management Facility 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains this proposed AD, the regulatory 
evaluation, any comments received, and other information. The street 
address for the Docket Office (telephone 800-647-5527) is in the 
ADDRESSES section. Comments will be available in the AD docket shortly 
after receipt.

FOR FURTHER INFORMATION CONTACT: Georgios Roussos, Aerospace Engineer, 
Systems and Equipment Branch, ANM-130S, FAA, Seattle Aircraft 
Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057-
3356; telephone (425) 917-6482; fax (425) 917-6590.

SUPPLEMENTARY INFORMATION: 

Comments Invited

    We invite you to send any written relevant data, views, or 
arguments about this proposed AD. Send your comments to an address 
listed under the ADDRESSES section. Include ``Docket No. FAA-2010-1205; 
Directorate Identifier 2010-NM-146-AD'' at the beginning of your 
comments. We specifically invite comments on the overall regulatory, 
economic, environmental, and energy aspects of this proposed AD. We 
will consider all comments received by the closing date and may amend 
this proposed AD because of those comments.
    We will post all comments we receive, without change, to http://www.regulations.gov, including any personal information you provide. We 
will also post a report summarizing each substantive verbal contact we 
receive about this proposed AD.

Discussion

    The FAA has examined the underlying safety issues involved in fuel 
tank explosions on several large transport airplanes, including the 
adequacy of existing regulations, the service history of airplanes 
subject to those regulations, and existing maintenance practices for 
fuel tank systems. As a result of those findings, we issued a 
regulation titled ``Transport Airplane Fuel Tank System Design Review, 
Flammability Reduction and Maintenance and Inspection Requirements'' 
(66 FR 23086, May 7, 2001). In addition to new airworthiness standards 
for transport airplanes and new maintenance requirements, this rule 
included Special Federal Aviation Regulation No. 88 (``SFAR 88,'' 
Amendment 21-78, and subsequent Amendments 21-82 and 21-83).
    Among other actions, SFAR 88 requires certain type design (i.e., 
type certificate (TC) and supplemental type certificate (STC)) holders 
to substantiate that their fuel tank systems can prevent ignition 
sources in the fuel tanks. This requirement applies to type design 
holders for large turbine-powered transport airplanes and for 
subsequent modifications to those airplanes. It requires them to 
perform design reviews and to develop design changes and maintenance 
procedures if their designs do not meet the new fuel tank safety 
standards. As explained in the preamble to the rule, we intended to 
adopt airworthiness directives to mandate any changes found necessary 
to address

[[Page 81509]]

unsafe conditions identified as a result of these reviews.
    In evaluating these design reviews, we have established four 
criteria intended to define the unsafe conditions associated with fuel 
tank systems that require corrective actions. The percentage of 
operating time during which fuel tanks are exposed to flammable 
conditions is one of these criteria. The other three criteria address 
the failure types under evaluation: single failures, single failures in 
combination with a latent condition(s), and in-service failure 
experience. For all four criteria, the evaluations included 
consideration of previous actions taken that may mitigate the need for 
further action.
    We have determined that the actions identified in this AD are 
necessary to reduce the potential of ignition sources inside fuel 
tanks, which, in combination with flammable fuel vapors, could result 
in a fuel tank explosion and consequent loss of the airplane.
    As part of the SFAR 88 analysis, Boeing found indications of wiring 
deterioration that could cause electrical faults in the main tank boost 
pumps, main tank jettison pumps, or center tank override/jettison pumps 
could result in an overheat or electrical arc condition that could 
provide an ignition source in the fuel tanks. Also, uncommanded dry 
operation of the main tank jettison pumps or the center tank override/
jettison pumps could result from electrical faults or a single failure 
in the pump switch or the electrical load control unit (ELCU). Extended 
dry operation of the pump could cause an overheat condition, electrical 
arc, or frictional sparks, providing an ignition source in the fuel 
tanks. These ignition sources, in combination with flammable fuel 
vapors, could result in a fuel tank explosion and consequent loss of 
the airplane.

Relevant Service Information

    We have reviewed Boeing Service Bulletin 777-28A0038, Revision 1, 
dated September 20, 2010. That service bulletin describes procedures 
for replacing 4 main tank boost pump relays in electrical load 
management system (ELMS) panels P110, P210, and P320, with new ground 
fault interrupter (GFI) relays.
    Boeing Service Bulletin 777-28A0038, Revision 1, dated September 
20, 2010, references the service bulletins identified in the following 
table as additional sources of guidance for replacing the main tank 
boost pump relays.

    Table--Service Bulletins for Boeing Service Bulletin 777-28A0038
------------------------------------------------------------------------
        Service bulletin            Revision level           Date
------------------------------------------------------------------------
GE Aviation Service Bulletin      1.................  January 7, 2010.
 4000ELM-28-448.
GE Aviation Service Bulletin      1.................  January 7, 2010.
 4000ELM-28-451.
GE Aviation Service Bulletin      1.................  January 7, 2010.
 5000ELM-28-446.
GE Aviation Service Bulletin      1.................  January 7, 2010.
 5000ELM-28-449.
Smiths Service Bulletin 4000ELM-  Original..........  August 8, 2007.
 28-445.
Smiths Service Bulletin 4000ELM-  Original..........  August 8, 2007.
 28-465.
Smiths Service Bulletin 5000ELM-  Original..........  August 8, 2007.
 28-443.
Smiths Service Bulletin 5000ELM-  Original..........  August 8, 2007.
 28-463.
Smiths Service Bulletin 6000ELM-  Original..........  August 8, 2007.
 28-444.
Smiths Service Bulletin 6000ELM-  Original..........  August 8, 2007.
 28-447.
Smiths Service Bulletin 6000ELM-  Original..........  August 8, 2007.
 28-450.
Smiths Service Bulletin 6000ELM-  Original..........  August 8, 2007.
 28-464.
------------------------------------------------------------------------

    We have also reviewed Boeing Service Bulletin 777-28A0037, Revision 
2, dated September 20, 2010. That service bulletin describes procedures 
for certain airplanes, for installing new panels, P301 and P302, in the 
main equipment center; making certain wiring changes; installing new 
GFI relays in the P301 and P302 panels; and installing new ELMS 
software. For certain airplanes, that service bulletin describes 
procedures for measuring the bond resistance between the terminal lugs 
on certain studs and a ground bracket assembly, and corrective action 
if necessary. The corrective actions include repairing (cleaning of 
applicable components with solvent) or replacing (replacing applicable 
components with new components) affected components.
    Boeing Service Bulletin 777-28A0039, Revision 2, dated September 
20, 2010, is an additional source of guidance for installing ELMS 
software.
    Smiths Service Bulletin 5000ELM-28-454, dated August 13, 2007; and 
GE Aviation Service Bulletin 6000ELM-28-455, Revision 1, dated February 
1, 2010; are additional sources of guidance for making wiring changes 
in the P110 and P210 panels.

FAA's Determination and Requirements of This Proposed AD

    We are proposing this AD because we evaluated all relevant 
information and determined the unsafe condition described previously is 
likely to exist or develop in other products of the same type design. 
This proposed AD would require accomplishing the actions specified in 
the service information described previously.

Costs of Compliance

    We estimate that this proposed AD would affect 130 airplanes of 
U.S. registry. The following table provides the estimated costs for 
U.S. operators to comply with this proposed AD.

[[Page 81510]]



                                                                                     Table--Estimated Costs
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                        Average labor rate                                                  Number of U.S.-
                     Action                           Work hours             per hour                Parts           Cost per product    registered airplanes              Fleet cost
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Replacements: Group 1 airplanes identified in                       3                   $85               $25,577               $25,832                   126  $3,254,832.
 Boeing Service Bulletin 777-28A0038.
Replacements: Group 2 airplanes identified in                       3                    85                52,545                52,800                     0  No airplanes currently on U.S.
 Boeing Service Bulletin 777-28A0038.                                                                                                                           Register.
Replacements: Group 3 airplanes identified in                       4                    85                37,257                37,597                     4  150,388.
 Boeing Service Bulletin 777-28A0038.
Replacements: Group 4 airplanes identified in                       4                    85                17,816                18,156                     0  No airplanes currently on U.S.
 Boeing Service Bulletin 777-28A0038.                                                                                                                           Register.
Installations and Measurement: Boeing Service                      76                    85                29,934                36,394                   130  4,731,220.
 Bulletin 777-28A0037.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


[[Page 81511]]

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 Findings

    We determined that this proposed AD would not have federalism 
implications under Executive Order 13132. This proposed AD would 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.
    For the reasons discussed above, I certify this proposed 
regulation:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866,
    2. Is not a ``significant rule'' under the 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.
    You can find our regulatory evaluation and the estimated costs of 
compliance in the AD Docket.

List of Subjects in 14 CFR Part 39

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

The Proposed Amendment

    Accordingly, under the authority delegated to me by the 
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    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]

    2. The FAA amends Sec.  39.13 by adding the following new AD:

The Boeing Company: Docket No. FAA-2010-1205; Directorate Identifier 
2010-NM-146-AD.

Comments Due Date

    (a) We must receive comments by February 11, 2011.

Affected ADs

    (b) AD 2008-11-13, Amendment 39-15536, affects this AD.

Applicability

    (c) This AD applies to The Boeing Company Model 777-200, -200LR, 
-300, and -300ER series airplanes, certificated in any category; as 
identified in the service information specified in paragraphs (c)(1) 
and (c)(2) of this AD.
    (1) Boeing Service Bulletin 777-28A0038, Revision 1, dated 
September 20, 2010.
    (2) Boeing Service Bulletin 777-28A0037, Revision 2, dated 
September 20, 2010.

Subject

    (d) Air Transport Association (ATA) of America Code 28: Fuel.

Unsafe Condition

    (e) This AD results from fuel system reviews conducted by the 
manufacturer. The Federal Aviation Administration is issuing this AD 
to prevent the potential of ignition sources inside fuel tanks, 
which, in combination with flammable fuel vapors, could result in a 
fuel tank explosion and consequent loss of the airplane.

Compliance

    (f) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Related Airworthiness Limitation

    Note 1: AD 2008-11-13 requires a revision of the Airworthiness 
Limitations (AWLs) section of the Instructions for Continued 
Airworthiness to include limitations for the fuel tank systems. One 
of the limitations, AWL 28-AWL-18, requires a repetitive inspection 
of the ground fault interrupter (GFI) functions.

Installations and Software Changes

    (g) For Group 1 and 2 airplanes identified as Configuration 2 in 
Boeing Service Bulletin 777-28A0037, Revision 2, dated September 20, 
2010: Within 36 months after the effective date of this AD, install 
new panels, P301 and P302, in the main equipment center; make 
certain wiring changes; install new GFI relays in the P301 and P302 
panels; and install new electrical load management system (ELMS) 
software; as applicable. Do the applicable actions in accordance 
with the Accomplishment Instructions of Boeing Service Bulletin 777-
28A0037, Revision 2, dated September 20, 2010.

    Note 2:  Boeing Service Bulletin 777-28A0039, Revision 2, dated 
September 20, 2010, is an additional source of guidance for 
installing ELMS software.


    Note 3: Smiths Service Bulletin 5000ELM-28-454, dated August 13, 
2007; and GE Aviation Service Bulletin 6000ELM-28-455, Revision 1, 
dated February 1, 2010; are additional sources of guidance for 
making a wiring change in the P110 and P210 panels, respectively.

    (h) For Group 1 and 2 airplanes identified as Configuration 1 in 
Boeing Service Bulletin 777-28A0037, Revision 2, dated September 20, 
2010: Within 36 months after the effective date of this AD, do 
bonding resistance measurements to verify bonding requirements as 
specified in Boeing Service Bulletin 777-28A0037, Revision 2, dated 
September 20, 2010, are met, in accordance with the Accomplishment 
Instructions of Boeing Service Bulletin 777-28A0037, Revision 2, 
dated September 20, 2010.

Replacement of GFI Relays

    (i) For airplanes identified in Boeing Service Bulletin 777-
28A0038, Revision 1, dated September 20, 2010: Within 60 months 
after the effective date of this AD, replace 4 main tank boost pump 
relays in electrical load management system panels P110, P210, and 
P320 with new GFI relays, in accordance with the Accomplishment 
Instructions of Boeing Service Bulletin 777-28A0038, Revision 1, 
dated September 20, 2010.

    Note 4:  Boeing Service Bulletin 777-28A0038, Revision 1, dated 
September 20, 2010, references the service bulletins identified in 
Table 1 of this AD as additional sources of guidance for replacing 
the main tank boost pump relays.


              Table 1--Additional Sources of Guidance for Replacing the Main Tank Boost Pump Relays
----------------------------------------------------------------------------------------------------------------
    Group No. of airplanes, as
   identified in Boeing Service
 Bulletin 777-28A0038, Revision 1,  Panel No.     Service bulletin       Revision level             Date
     dated September 20, 2010
----------------------------------------------------------------------------------------------------------------
Group 1...........................       P110  Smiths Service         Original............  August 8, 2007.
                                                Bulletin 5000ELM-28-
                                                443.

[[Page 81512]]

 
Group 1...........................       P210  Smiths Service         Original............  August 8, 2007.
                                                Bulletin 6000ELM-28-
                                                444.
Group 1...........................       P320  Smiths Service         Original............  August 8, 2007.
                                                Bulletin 4000ELM-28-
                                                445.
Group 2...........................       P110  GE Aviation Service    1...................  January 7, 2010.
                                                Bulletin 5000ELM-28-
                                                446.
Group 2...........................       P210  Smiths Service         Original............  August 8, 2007.
                                                Bulletin 6000ELM-28-
                                                447.
Group 2...........................       P320  GE Aviation Service    1...................  January 7, 2010.
                                                Bulletin 4000ELM-28-
                                                448.
Group 3...........................       P110  GE Aviation Service    1...................  January 7, 2010.
                                                Bulletin 5000ELM-28-
                                                449.
Group 3...........................       P210  Smiths Service         Original............  August 8, 2007.
                                                Bulletin 6000ELM-28-
                                                450.
Group 3...........................       P320  GE Aviation Service    1...................  January 7, 2010.
                                                Bulletin 4000ELM-28-
                                                451.
Group 4...........................       P110  Smiths Service         Original............  August 8, 2007.
                                                Bulletin 5000ELM-28-
                                                463.
Group 4...........................       P210  Smiths Service         Original............  August 8, 2007.
                                                Bulletin 6000ELM-28-
                                                464.
Group 4...........................       P320  Smiths Service         Original............  August 8, 2007.
                                                Bulletin 4000ELM-28-
                                                465.
----------------------------------------------------------------------------------------------------------------

Paperwork Reduction Act Burden Statement

    (j) A federal agency may not conduct or sponsor, and a person is 
not required to respond to, nor shall a person be subject to a 
penalty for failure to comply with a collection of information 
subject to the requirements of the Paperwork Reduction Act unless 
that collection of information displays a current valid OMB Control 
Number. The OMB Control Number for this information collection is 
2120-0056. Public reporting for this collection of information is 
estimated to be approximately 5 minutes per response, including the 
time for reviewing instructions, completing and reviewing the 
collection of information. All responses to this collection of 
information are mandatory. Comments concerning the accuracy of this 
burden and suggestions for reducing the burden should be directed to 
the FAA at: 800 Independence Ave., SW., Washington, DC 20591, Attn: 
Information Collection Clearance Officer, AES-200.

Alternative Methods of Compliance (AMOCs)

    (k)(1) The Manager, Seattle Aircraft Certification Office, FAA, 
has the authority to approve AMOCs for this AD, if requested using 
the procedures found in 14 CFR 39.19. Send information to Attn: 
Georgios Roussos, Aerospace Engineer, Systems and Equipment Branch, 
ANM-130S, FAA, Seattle Aircraft Certification Office, 1601 Lind 
Avenue, SW., Renton, Washington 98057-3356; telephone (425) 917-
6482; fax (425) 917-6590. Information may be e-mailed to: 9-ANM-Seattle-ACO-AMOC-Requests@faa.gov.
    (2) To request a different method of compliance or a different 
compliance time for this AD, follow the procedures in 14 CFR 39.19. 
Before using any approved AMOC on any airplane to which the AMOC 
applies, notify your principal maintenance inspector (PMI) or 
principal avionics inspector (PAI), as appropriate, or lacking a 
principal inspector, your local Flight Standards District Office. 
The AMOC approval letter must specifically reference this AD.

    Issued in Renton, Washington, on December 17, 2010.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.

[FR Doc. 2010-32657 Filed 12-27-10; 8:45 am]
BILLING CODE 4910-13-P