Airworthiness Directives; The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747-400F, 747SR, and 747SP Series Airplanes, 18446-18449 [2010-8249]

Download as PDF 18446 Federal Register / Vol. 75, No. 69 / Monday, April 12, 2010 / Proposed Rules terminate, as the case may be, collection of assessments under this subpart; and (2) As soon as practical, suspend or terminate, as the case may be, activities under this Order and regulations issued hereunder in an orderly manner. § 1245.73 Proceedings after termination. (a) Upon the termination of this subpart, the Board shall recommend to the Secretary not more than five of its members to serve as trustees for the purpose of liquidating the affairs of the Board. Such persons, upon designation by the Secretary, shall become trustees of all funds and property then in possession or under control of the Board, including claims for any funds unpaid or property not delivered or any other claim existing at the time of such termination. (b) The said trustees shall: (1) Continue in such capacity until discharged by the Secretary; (2) Carry out the obligations of the Board under any contracts or agreements entered into by it pursuant to Section 1245.37; (3) From time to time account for all receipts and disbursements and deliver all property on hand, together with all books and records of the Board and of the trustees, to such person as the Secretary may direct; and (4) Upon the direction of the Secretary, execute such assignments or other instruments necessary or appropriate to vest in such person full title and right to all of the funds, property, and claims vested in the Board or the trustees pursuant to this subpart. (c) Any person to whom funds, property, or claims have been transferred or delivered pursuant to this subpart shall be subject to the same obligations as imposed upon the trustees. (d) Any residual funds not required to defray the necessary expenses of liquidation shall be returned to the persons who contributed such funds, or paid assessments, or if not practicable, shall be turned over to the Department to be utilized, to the extent practicable, in the interest of continuing one or more of the honey research or education programs hitherto authorized. srobinson on DSKHWCL6B1PROD with PROPOSALS § 1245.74 Effect of termination or amendment. Unless otherwise expressly provided by the Secretary, terminating or amending this subpart or any regulation issued under it will not: (a) Affect or waive any right, duty, obligation, or liability that arose or may arise in connection with any provision of this subpart; (b) Release or extinguish any violation of this subpart; or VerDate Nov<24>2008 17:01 Apr 09, 2010 Jkt 220001 (c) Affect or impair any rights or remedies of the United States or any person with respect to any violation. § 1245.75 Personal liability. No member, alternate member, employee, or agent of the Board shall be held personally responsible, either individually or jointly with others, in any way whatsoever to any person for errors in judgment, mistakes, or other acts, either of commission or omission, as such member, alternate member, employee, or agent, except for acts of dishonesty or willful misconduct. § 1245.76 Separability. If any provision of this subpart is declared invalid or the applicability thereof to any person or circumstance is held invalid, the validity of the remainder of this subpart, or the applicability thereof to other persons or circumstances shall not be affected thereby. § 1245.77 Amendments. Amendments to this Order may be proposed from time to time by the Board or by any interested person affected by the provisions of the Act, including the Department. § 1245.78 OMB control numbers. The control number assigned to the information collection requirements in this part by the Office of Management and Budget pursuant to the Paperwork Reduction Act of 1995, 44 U.S.C. Chapter 35, is OMB control number 0505–0001, OMB control number 0581– 0217, and OMB control number 0581– [NEW, to be assigned by OMB]. Dated: March 26, 2010. David R. Shipman, Acting Administrator. [FR Doc. 2010–7575 Filed 4–9–10; 8:45 am] BILLING CODE P DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2010–0275; Directorate Identifier 2009–NM–231–AD] RIN 2120–AA64 Airworthiness Directives; The Boeing Company Model 747–100, 747–100B, 747–100B SUD, 747–200B, 747–200C, 747–200F, 747–300, 747–400, 747– 400F, 747SR, and 747SP Series Airplanes AGENCY: Federal Aviation Administration (FAA), DOT. PO 00000 Frm 00019 Fmt 4702 Sfmt 4702 ACTION: Notice of proposed rulemaking (NPRM). SUMMARY: We propose to adopt a new airworthiness directive (AD) for certain Model 747–100, 747–100B, 747–100B SUD, 747–200B, 747–200C, 747–200F, 747–300, 747–400, 747–400F, 747SR, and 747SP series airplanes. This proposed AD would require reworking or replacing certain duct assemblies in the environmental control system (ECS). This proposed AD results from reports of duct assemblies in the ECS with burned Boeing Material Specification (BMS) 8–39 polyurethane foam insulation. This proposed AD also results from a report from the airplane manufacturer that airplanes were assembled with duct assemblies in the ECS wrapped with BMS 8–39 polyurethane foam insulation, a material of which the fire retardant properties deteriorate with age. We are proposing this AD to prevent a potential electrical arc from igniting the BMS 8– 39 polyurethane foam insulation on the duct assemblies of the ECS, which could propagate a small fire and lead to a larger fire that might spread throughout the airplane through the ECS. DATES: We must receive comments on this proposed AD by May 27, 2010. ADDRESSES: You may send comments by any of the following methods: • Federal eRulemaking Portal: Go to https://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 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. 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. E:\FR\FM\12APP1.SGM 12APP1 Federal Register / Vol. 75, No. 69 / Monday, April 12, 2010 / Proposed Rules Examining the AD Docket You may examine the AD docket on the Internet at https:// 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: Sue McCormick, Aerospace Engineer, Cabin Safety and Environmental Systems Branch, ANM–150S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (303) 342–1082; fax (425) 917–6590. SUPPLEMENTARY INFORMATION: srobinson on DSKHWCL6B1PROD with PROPOSALS 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–2010–0275; Directorate Identifier 2009–NM–231–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 https:// 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 We have received reports of duct assemblies in the environmental control system (ECS) with burned Boeing Material Specification (BMS) 8–39 polyurethane foam insulation on two Model 767–200 series airplanes. The airplane manufacturer has also notified us that certain Model 767–200 and 767– 300 series airplanes and certain Model 747 airplanes were assembled with duct assemblies in the ECS wrapped with BMS 8–39 polyurethane foam insulation. The fire-retardant properties of the BMS 8–39 polyurethane foam insulation deteriorate with age. This, along with dust, dirt, and other carbon particulate contamination of the insulation on the ducts, adds an VerDate Nov<24>2008 20:49 Apr 09, 2010 Jkt 220001 available fuel source for a potential fire. Once ignited, the foam insulation emits noxious smoke, does not self-extinguish, and drips droplets of liquefied polyurethane, which can further propagate a fire. Because the insulation is wrapped around the duct assemblies, which are located throughout the airplane, if the insulation is ignited a fire could potentially travel along the ducts and spread throughout the airplane. This condition, if not corrected, could result in a potential electrical arc igniting the BMS 8–39 polyurethane foam insulation on the duct assemblies of the ECS, which could propagate a small fire and lead to a larger fire that may spread throughout the airplane through the ECS. Other Relevant Rulemaking On January 14, 2008, we issued AD 2008–02–16, amendment 39–15346, applicable to certain Model 767–200 and 767–300 series airplanes. That AD requires reworking certain duct assemblies in the ECS. That AD resulted from reports of duct assemblies in the ECS with burned BMS 8–39 polyurethane foam insulation. That AD also resulted from a report from the airplane manufacturer that airplanes were assembled with duct assemblies in the ECS wrapped with BMS 8–39 polyurethane foam insulation, a material of which the fire retardant properties deteriorate with age. We issued that AD to prevent a potential electrical arc from igniting the BMS 8– 39 polyurethane foam insulation on the duct assemblies of the ECS, which could propagate a small fire and lead to a larger fire that might spread throughout the airplane through the ECS. Additionally, on December 14, 2001, we issued AD 2001–26–09, amendment 39–12573 (66 FR 66734, December 27, 2001), applicable to certain Model 767– 200 series airplanes. That AD requires a one-time inspection for damage of the water line heater tape where it passes close to the duct assemblies of the air distribution system for the flight compartment. That AD also requires eventual replacement of certain duct assemblies or foam insulation on those duct assemblies with new assemblies or improved foam insulation. That AD was prompted by a report of burned BMS 8– 39 polyurethane foam insulation on an air distribution system duct located in the electronics and electrical compartment. The actions required by that AD are intended to prevent ignition of foam insulation on the air distribution ducts, which could result in a fire in the airplane. We are considering additional rulemaking for Model 737–100, –200, PO 00000 Frm 00020 Fmt 4702 Sfmt 4702 18447 –200C, and –300 series airplanes, which have been determined to be subject to the same unsafe condition. Relevant Service Information We have reviewed Boeing Service Bulletin 747–21A2421, Revision 2, dated December 19, 2006. This service bulletin describes procedures for reworking the affected duct assemblies in approximately 44 locations within the ECS systems. The affected duct assemblies vary depending on airplane configuration. These are some examples of affected ECS systems: • Air conditioning, flight deck • Duct installation, conditioned air • Duct installation, air distribution system • Duct installation, individual air system • Anemostat installation, air distribution system • Humidifier duct installation • Heat exchanger installation, air conditioning system • Recirculation fan installation, flight deck We have also reviewed Boeing Service Bulletin 747–21A2422, Revision 2, dated November 16, 2006. This service bulletin describes procedures for reworking or replacing the single duct assembly in the forward lower cargo bay. The rework includes removing the BMS 8–39 polyurethane foam insulation and replacing it with BMS 8–300 polyimide foam insulation that meets flammability criteria of Section 25.856 (‘‘Fire Protection: Thermal/Acoustic Insulation Materials’’) of the Federal Aviation Regulations (14 CFR 25.856(a)). These service bulletins also describe procedures for part-marking reworked duct assemblies with new part numbers. 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, except as discussed under ‘‘Differences Between the Proposed AD and the Service Bulletins.’’ Differences Between the Proposed AD and the Service Bulletins Boeing Service Bulletin 747– 21A2421, Revision 2, dated December 19, 2006, recommends reworking the affected duct assemblies ‘‘during the next heavy maintenance visit, not to E:\FR\FM\12APP1.SGM 12APP1 18448 Federal Register / Vol. 75, No. 69 / Monday, April 12, 2010 / Proposed Rules exceed 30,000 flight-hours’’ from the date on that service bulletin. Boeing Service Bulletin 747–21A2422, Revision 2, dated November 16, 2006, does not recommend any compliance time for reworking or replacing the affected duct assemblies. This proposed AD would require operators to rework or replace the affected duct assemblies within 72 months after the effective date of the AD. In developing the compliance time for this action, we considered the degree of urgency associated with addressing the subject unsafe condition. We also considered the availability of required parts and the practical aspect of reworking or replacing the affected duct assemblies within an interval that parallels normal scheduled maintenance for most affected operators. We have determined that the average utilization of the Model 747 fleet is approximately 5,000 flight hours each year. Therefore, we have determined that 72 months is equivalent to the recommended compliance time of 30,000 flight hours and it represents an appropriate interval in which an ample number of required parts will be available to modify the affected fleet without adversely affecting the safety of these airplanes. This difference has been coordinated with Boeing. Costs of Compliance There are about 558 airplanes of the affected design in the worldwide fleet. The average labor rate is $85 per workhour. The following table provides the estimated costs for U.S. operators to comply with this proposed AD. ESTIMATED COSTS Action Work hours Parts cost, per airplane Duct assembly rework, specified in Boeing Service Bulletin 747-21A2421. Duct assembly rework or replacement, specified in Boeing Service Bulletin 747-21A2422. 8 per duct (average of 130 ducts per airplane). 1 per duct (1 duct per airplane). 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. srobinson on DSKHWCL6B1PROD with PROPOSALS 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: VerDate Nov<24>2008 16:54 Apr 09, 2010 Jkt 220001 Cost per airplane Number of U.S.-registered airplanes $12,305 (average) ... $100,705 (average) 185 ........................... $18,630,425. The manufacturer states that it will supply required parts to the operators at no cost.. $85 ........................... Up to 168 ................. Up to $14,280. 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. § 39.13 [Amended] 2. The FAA amends § 39.13 by adding the following new AD: The Boeing Company: Docket No. FAA– 2010–0275; Directorate Identifier 2009– NM–231–AD. PO 00000 Frm 00021 Fmt 4702 Sfmt 4702 Fleet cost Comments Due Date (a) We must receive comments by May 27, 2010. Affected ADs (b) None. Applicability (c) This AD applies to the airplanes specified in paragraphs (c)(1) and (c)(2) of this AD, certificated in any category. (1) The Boeing Company Model 747–100, 747–100B, 747–100B SUD, 747–200B, 747– 200C, 747–200F, 747–300, 747–400, 747SR, and 747SP series airplanes identified in Boeing Service Bulletin 747–21A2421, Revision 2, dated December 19, 2006. (2) The Boeing Company Model 747–100, 747–100B, 747–200B, 747–200C, 747–200F, 747–300, 747–400F, 747SR, and 747SP series airplanes identified in Boeing Service Bulletin 747–21A2422, Revision 2, dated November 16, 2006. Subject (d) Air Transport Association (ATA) of America Code 21: Air conditioning. Unsafe Condition (e) This AD results from reports of duct assemblies in the environmental control system (ECS) with burned Boeing Material Specification (BMS) 8–39 polyurethane foam insulation. This AD also results from a report from the airplane manufacturer that airplanes were assembled with duct assemblies in the ECS wrapped with BMS 8–39 polyurethane foam insulation, a material of which the fire retardant properties deteriorate with age. We are issuing this AD to prevent a potential electrical arc from igniting the BMS 8–39 polyurethane foam insulation on the duct assemblies of the ECS, which could E:\FR\FM\12APP1.SGM 12APP1 Federal Register / Vol. 75, No. 69 / Monday, April 12, 2010 / Proposed Rules propagate a small fire and lead to a larger fire that could spread throughout the airplane through the ECS. DEPARTMENT OF HOMELAND SECURITY Compliance Coast Guard (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. 33 CFR Part 165 ECS Duct Assembly Rework or Replacement (g) Within 72 months after the effective date of this AD, rework or replace the applicable duct assemblies in the ECS specified in and in accordance with the Accomplishment Instructions and Appendices A through F of Boeing Service Bulletin 747–21A2421, Revision 2, dated December 19, 2006 (for Model 747–100, 747– 100B, 747–100B SUD, 747–200B, 747–200C, 747–200F, 747–300, 747–400, 747SR, and 747SP series airplanes); and the Accomplishment Instructions and Appendices A through C of Boeing Service Bulletin 747–21A2422, Revision 2, dated November 16, 2006 (for Model 747–100, 747– 100B, 747–200B, 747–200C, 747–200F, 747– 300, 747–400F, 747SR, and 747SP series airplanes). Parts Installation (h) As of the effective date of this AD, no person may install an ECS duct assembly with BMS 8–39 polyurethane foam insulation on any airplane. srobinson on DSKHWCL6B1PROD with PROPOSALS Alternative Methods of Compliance (AMOCs) (i)(1) The Manager, Seattle Aircraft Certification Office (ACO), 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: Sue McCormick, Aerospace Engineer, Cabin Safety and Environmental Systems Branch, ANM–150S, FAA, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98057–3356; telephone (303) 342–1082; fax (425) 917–6590. Or, e-mail information to 9-ANM-Seattle-ACOAMOC-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 April 1, 2010. Ali Bahrami, Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 2010–8249 Filed 4–9–10; 8:45 am] BILLING CODE 4910–13–P VerDate Nov<24>2008 16:54 Apr 09, 2010 Jkt 220001 [Docket No. USCG–2008–1017] RIN 1625–AA11 Regulated Navigation Areas; Bars Along the Coasts of Oregon and Washington; Amendment Coast Guard, DHS. Notice of proposed rulemaking. AGENCY: ACTION: SUMMARY: The Coast Guard proposes to change the Regulated Navigation Area (RNA) covering the Umpqua River Bar in Oregon so that it does not include those waters between ‘‘Navigation Aid Number 8’’ and ‘‘Navigation Aid Number 6’’ on the Umpqua River. The change has been requested by a number of individuals and organizations that believe they are able to safely use those waters when the bar is restricted or closed. DATES: Comments and related material must be received by the Coast Guard on or before May 12, 2010. Requests for public meetings must be received by the Coast Guard on or before May 12, 2010. ADDRESSES: You may submit comments identified by docket number USCG– 2008–1017 using any one of the following methods: (1) Federal eRulemaking Portal: https://www.regulations.gov. (2) Fax: 202–493–2251. (3) Mail: Docket Management Facility (M–30), U.S. Department of Transportation, West Building Ground Floor, Room W12–140, 1200 New Jersey Avenue, SE., Washington, DC 20590– 0001. (4) Hand delivery: Same as mail address above, between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The telephone number is 202–366–9329. To avoid duplication, please use only one of these four methods. See the ‘‘Public Participation and Request for Comments’’ portion of the SUPPLEMENTARY INFORMATION section below for instructions on submitting comments. FOR FURTHER INFORMATION CONTACT: If you have questions on this proposed rule, call or e-mail LT Kion Evans, Thirteenth Coast Guard District, Prevention Division; telephone 206– 220–7232, e-mail Kion.J.Evans@uscg.mil. If you have questions on viewing or submitting material to the docket, call Renee V. PO 00000 Frm 00022 Fmt 4702 Sfmt 4702 18449 Wright, Program Manager, Docket Operations, telephone 202–366–9826. SUPPLEMENTARY INFORMATION: Public Participation and Request for Comments We encourage you to participate in this rulemaking by submitting comments and related materials. All comments received will be posted without change to https:// www.regulations.gov and will include any personal information you have provided. Submitting Comments If you submit a comment, please include the docket number for this rulemaking (USCG–2008–1017), indicate the specific section of this document to which each comment applies, and provide a reason for each suggestion or recommendation. You may submit your comments and material online (via https:// www.regulations.gov) or by fax, mail, or hand delivery, but please use only one of these means. If you submit a comment online via www.regulations.gov, it will be considered received by the Coast Guard when you successfully transmit the comment. If you fax, hand deliver, or mail your comment, it will be considered as having been received by the Coast Guard when it is received at the Docket Management Facility. We recommend that you include your name and a mailing address, an e-mail address, or a telephone number in the body of your document so that we can contact you if we have questions regarding your submission. To submit your comment online, go to https://www.regulations.gov, click on the ‘‘submit a comment’’ box, which will then become highlighted in blue. In the ‘‘Document Type’’ drop down menu select ‘‘Proposed Rule’’ and insert ‘‘USCG–2008–1017’’ in the ‘‘Keyword’’ box. Click ‘‘Search’’ then click on the balloon shape in the ‘‘Actions’’ column. If you submit your comments by mail or hand delivery, submit them in an unbound format, no larger than 81⁄2 by 11 inches, suitable for copying and electronic filing. If you submit comments by mail and would like to know that they reached the Facility, please enclose a stamped, self-addressed postcard or envelope. We will consider all comments and material received during the comment period and may change the rule based on your comments. Viewing Comments and Documents To view comments, as well as documents mentioned in this preamble E:\FR\FM\12APP1.SGM 12APP1

Agencies

[Federal Register Volume 75, Number 69 (Monday, April 12, 2010)]
[Proposed Rules]
[Pages 18446-18449]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-8249]


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

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0275; Directorate Identifier 2009-NM-231-AD]
RIN 2120-AA64


Airworthiness Directives; The Boeing Company Model 747-100, 747-
100B, 747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 
747-400F, 747SR, and 747SP 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 747-100, 747-100B, 747-100B SUD, 747-200B, 747-200C, 747-
200F, 747-300, 747-400, 747-400F, 747SR, and 747SP series airplanes. 
This proposed AD would require reworking or replacing certain duct 
assemblies in the environmental control system (ECS). This proposed AD 
results from reports of duct assemblies in the ECS with burned Boeing 
Material Specification (BMS) 8-39 polyurethane foam insulation. This 
proposed AD also results from a report from the airplane manufacturer 
that airplanes were assembled with duct assemblies in the ECS wrapped 
with BMS 8-39 polyurethane foam insulation, a material of which the 
fire retardant properties deteriorate with age. We are proposing this 
AD to prevent a potential electrical arc from igniting the BMS 8-39 
polyurethane foam insulation on the duct assemblies of the ECS, which 
could propagate a small fire and lead to a larger fire that might 
spread throughout the airplane through the ECS.

DATES: We must receive comments on this proposed AD by May 27, 2010.

ADDRESSES: You may send comments by any of the following methods:
     Federal eRulemaking Portal: Go to https://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 
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. 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.

[[Page 18447]]

Examining the AD Docket

    You may examine the AD docket on the Internet at https://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: Sue McCormick, Aerospace Engineer, 
Cabin Safety and Environmental Systems Branch, ANM-150S, FAA, Seattle 
Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, 
Washington 98057-3356; telephone (303) 342-1082; 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-2010-0275; 
Directorate Identifier 2009-NM-231-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 https://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

    We have received reports of duct assemblies in the environmental 
control system (ECS) with burned Boeing Material Specification (BMS) 8-
39 polyurethane foam insulation on two Model 767-200 series airplanes. 
The airplane manufacturer has also notified us that certain Model 767-
200 and 767-300 series airplanes and certain Model 747 airplanes were 
assembled with duct assemblies in the ECS wrapped with BMS 8-39 
polyurethane foam insulation. The fire-retardant properties of the BMS 
8-39 polyurethane foam insulation deteriorate with age. This, along 
with dust, dirt, and other carbon particulate contamination of the 
insulation on the ducts, adds an available fuel source for a potential 
fire. Once ignited, the foam insulation emits noxious smoke, does not 
self-extinguish, and drips droplets of liquefied polyurethane, which 
can further propagate a fire. Because the insulation is wrapped around 
the duct assemblies, which are located throughout the airplane, if the 
insulation is ignited a fire could potentially travel along the ducts 
and spread throughout the airplane. This condition, if not corrected, 
could result in a potential electrical arc igniting the BMS 8-39 
polyurethane foam insulation on the duct assemblies of the ECS, which 
could propagate a small fire and lead to a larger fire that may spread 
throughout the airplane through the ECS.

Other Relevant Rulemaking

    On January 14, 2008, we issued AD 2008-02-16, amendment 39-15346, 
applicable to certain Model 767-200 and 767-300 series airplanes. That 
AD requires reworking certain duct assemblies in the ECS. That AD 
resulted from reports of duct assemblies in the ECS with burned BMS 8-
39 polyurethane foam insulation. That AD also resulted from a report 
from the airplane manufacturer that airplanes were assembled with duct 
assemblies in the ECS wrapped with BMS 8-39 polyurethane foam 
insulation, a material of which the fire retardant properties 
deteriorate with age. We issued that AD to prevent a potential 
electrical arc from igniting the BMS 8-39 polyurethane foam insulation 
on the duct assemblies of the ECS, which could propagate a small fire 
and lead to a larger fire that might spread throughout the airplane 
through the ECS.
    Additionally, on December 14, 2001, we issued AD 2001-26-09, 
amendment 39-12573 (66 FR 66734, December 27, 2001), applicable to 
certain Model 767-200 series airplanes. That AD requires a one-time 
inspection for damage of the water line heater tape where it passes 
close to the duct assemblies of the air distribution system for the 
flight compartment. That AD also requires eventual replacement of 
certain duct assemblies or foam insulation on those duct assemblies 
with new assemblies or improved foam insulation. That AD was prompted 
by a report of burned BMS 8-39 polyurethane foam insulation on an air 
distribution system duct located in the electronics and electrical 
compartment. The actions required by that AD are intended to prevent 
ignition of foam insulation on the air distribution ducts, which could 
result in a fire in the airplane.
    We are considering additional rulemaking for Model 737-100, -200, -
200C, and -300 series airplanes, which have been determined to be 
subject to the same unsafe condition.

Relevant Service Information

    We have reviewed Boeing Service Bulletin 747-21A2421, Revision 2, 
dated December 19, 2006. This service bulletin describes procedures for 
reworking the affected duct assemblies in approximately 44 locations 
within the ECS systems. The affected duct assemblies vary depending on 
airplane configuration. These are some examples of affected ECS 
systems:
     Air conditioning, flight deck
     Duct installation, conditioned air
     Duct installation, air distribution system
     Duct installation, individual air system
     Anemostat installation, air distribution system
     Humidifier duct installation
     Heat exchanger installation, air conditioning system
     Recirculation fan installation, flight deck
    We have also reviewed Boeing Service Bulletin 747-21A2422, Revision 
2, dated November 16, 2006. This service bulletin describes procedures 
for reworking or replacing the single duct assembly in the forward 
lower cargo bay. The rework includes removing the BMS 8-39 polyurethane 
foam insulation and replacing it with BMS 8-300 polyimide foam 
insulation that meets flammability criteria of Section 25.856 (``Fire 
Protection: Thermal/Acoustic Insulation Materials'') of the Federal 
Aviation Regulations (14 CFR 25.856(a)).
    These service bulletins also describe procedures for part-marking 
reworked duct assemblies with new part numbers.

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, except as discussed under 
``Differences Between the Proposed AD and the Service Bulletins.''

Differences Between the Proposed AD and the Service Bulletins

    Boeing Service Bulletin 747-21A2421, Revision 2, dated December 19, 
2006, recommends reworking the affected duct assemblies ``during the 
next heavy maintenance visit, not to

[[Page 18448]]

exceed 30,000 flight-hours'' from the date on that service bulletin. 
Boeing Service Bulletin 747-21A2422, Revision 2, dated November 16, 
2006, does not recommend any compliance time for reworking or replacing 
the affected duct assemblies. This proposed AD would require operators 
to rework or replace the affected duct assemblies within 72 months 
after the effective date of the AD. In developing the compliance time 
for this action, we considered the degree of urgency associated with 
addressing the subject unsafe condition. We also considered the 
availability of required parts and the practical aspect of reworking or 
replacing the affected duct assemblies within an interval that 
parallels normal scheduled maintenance for most affected operators. We 
have determined that the average utilization of the Model 747 fleet is 
approximately 5,000 flight hours each year. Therefore, we have 
determined that 72 months is equivalent to the recommended compliance 
time of 30,000 flight hours and it represents an appropriate interval 
in which an ample number of required parts will be available to modify 
the affected fleet without adversely affecting the safety of these 
airplanes. This difference has been coordinated with Boeing.

Costs of Compliance

    There are about 558 airplanes of the affected design in the 
worldwide fleet. The average labor rate is $85 per work-hour. The 
following table provides the estimated costs for U.S. operators to 
comply with this proposed AD.

                                                                     Estimated Costs
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                 Parts cost, per                               Number of U.S.-
               Action                      Work hours               airplane           Cost per airplane     registered airplanes        Fleet cost
--------------------------------------------------------------------------------------------------------------------------------------------------------
Duct assembly rework, specified in   8 per duct (average of  $12,305 (average).....  $100,705 (average)...  185..................  $18,630,425.
 Boeing Service Bulletin              130 ducts per
 747[dash]21A2421.                    airplane).
Duct assembly rework or              1 per duct (1 duct per  The manufacturer        $85..................  Up to 168............  Up to $14,280.
 replacement, specified in Boeing     airplane).              states that it will
 Service Bulletin 747[dash]21A2422.                           supply required parts
                                                              to the operators at
                                                              no cost..
--------------------------------------------------------------------------------------------------------------------------------------------------------

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-2010-0275; Directorate Identifier 
2009-NM-231-AD.

Comments Due Date

    (a) We must receive comments by May 27, 2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to the airplanes specified in paragraphs 
(c)(1) and (c)(2) of this AD, certificated in any category.
    (1) The Boeing Company Model 747-100, 747-100B, 747-100B SUD, 
747-200B, 747-200C, 747-200F, 747-300, 747-400, 747SR, and 747SP 
series airplanes identified in Boeing Service Bulletin 747-21A2421, 
Revision 2, dated December 19, 2006.
    (2) The Boeing Company Model 747-100, 747-100B, 747-200B, 747-
200C, 747-200F, 747-300, 747-400F, 747SR, and 747SP series airplanes 
identified in Boeing Service Bulletin 747-21A2422, Revision 2, dated 
November 16, 2006.

Subject

    (d) Air Transport Association (ATA) of America Code 21: Air 
conditioning.

Unsafe Condition

    (e) This AD results from reports of duct assemblies in the 
environmental control system (ECS) with burned Boeing Material 
Specification (BMS) 8-39 polyurethane foam insulation. This AD also 
results from a report from the airplane manufacturer that airplanes 
were assembled with duct assemblies in the ECS wrapped with BMS 8-39 
polyurethane foam insulation, a material of which the fire retardant 
properties deteriorate with age. We are issuing this AD to prevent a 
potential electrical arc from igniting the BMS 8-39 polyurethane 
foam insulation on the duct assemblies of the ECS, which could

[[Page 18449]]

propagate a small fire and lead to a larger fire that could spread 
throughout the airplane through the ECS.

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.

ECS Duct Assembly Rework or Replacement

    (g) Within 72 months after the effective date of this AD, rework 
or replace the applicable duct assemblies in the ECS specified in 
and in accordance with the Accomplishment Instructions and 
Appendices A through F of Boeing Service Bulletin 747-21A2421, 
Revision 2, dated December 19, 2006 (for Model 747-100, 747-100B, 
747-100B SUD, 747-200B, 747-200C, 747-200F, 747-300, 747-400, 747SR, 
and 747SP series airplanes); and the Accomplishment Instructions and 
Appendices A through C of Boeing Service Bulletin 747-21A2422, 
Revision 2, dated November 16, 2006 (for Model 747-100, 747-100B, 
747-200B, 747-200C, 747-200F, 747-300, 747-400F, 747SR, and 747SP 
series airplanes).

Parts Installation

    (h) As of the effective date of this AD, no person may install 
an ECS duct assembly with BMS 8-39 polyurethane foam insulation on 
any airplane.

Alternative Methods of Compliance (AMOCs)

    (i)(1) The Manager, Seattle Aircraft Certification Office (ACO), 
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: Sue McCormick, Aerospace Engineer, Cabin Safety and 
Environmental Systems Branch, ANM-150S, FAA, Seattle Aircraft 
Certification Office, 1601 Lind Avenue, SW., Renton, Washington 
98057-3356; telephone (303) 342-1082; fax (425) 917-6590. Or, e-mail 
information 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 April 1, 2010.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-8249 Filed 4-9-10; 8:45 am]
BILLING CODE 4910-13-P
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