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Federal Register / Vol. 86, No. 119 / Thursday, June 24, 2021 / Rules and Regulations final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Julie Linn, Aerospace Engineer, Cabin Safety and Environmental Systems Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA 98198;
phone and fax: 2062313584; email:
Julie.Linn@faa.gov.
SUPPLEMENTARY INFORMATION:

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Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 to supersede AD 20162529, Amendment 3918755 81 FR 94956, December 27, 2016 AD 20162529.
AD 20162529 applied to certain The Boeing Company Model 767200 and 300 series airplanes, and required replacing the cargo compartment insulation blankets on the left and right sides with new insulation blankets that incorporate fire stops. The NPRM
published in the Federal Register on August 10, 2020 85 FR 48122. The NPRM was prompted by a report of a fire in the bilge area of the cargo compartment that burned through the insulation blankets that were intended to prevent smoke from migrating behind the cargo compartment sidewall liners and upward into the main cabin. In the NPRM, the FAA proposed to continue to require the actions in AD 20162529
for certain airplanes. The NPRM also proposed to add airplanes to the applicability and proposed to require a general visual inspection of the replacement insulation blankets to determine if the blankets are in serviceable condition and correctly installed, and applicable on-condition actions. For certain airplanes, the NPRM
also proposed to require an inspection to determine the insulation blanket part number installed; replacement of additional insulation blankets; and applicable on-condition actions. The FAA is issuing this AD to address a fire in the bilge area of the cargo compartment, which if not contained could lead to a possible smoke and fire event in the passenger compartment.
Discussion of Final Airworthiness Directive Comments The FAA received comments from three commenters, including Aviation Partners Boeing, Delta Air Lines DAL, and United Airlines UAL. The following presents the comments
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received on the NPRM and the FAAs response to each comment.
Effect of Winglets on Accomplishment of the Proposed Actions Aviation Partners Boeing stated that the installation of winglets per Supplemental Type Certificate STC
ST01920SE does not affect the accomplishment of the manufacturers service instructions.
The FAA agrees with the commenter that STC ST01920SE does not affect the accomplishment of the manufacturers service instructions. Therefore, the installation of STC ST01920SE does not affect the ability to accomplish the actions required by this AD. The FAA
has not changed this AD in this regard.
Request To Delay Rule Pending Revised Referenced Service Information UAL concurs with the NPRM and requested that the FAA delay issuance of the final rule until the referenced Illustrated Parts Catalog IPC and airplane maintenance manual AMM
specified in Boeing Service Bulletin 767250550, Revision 1, dated December 4, 2019, are revised to ensure continued airworthiness and safety.
UAL stated that the referenced service information will provide proper documentation support to maintain the insulation blanket changes specified in Boeing Service Bulletin 767250550, Revision 1, dated December 4, 2019, prior to the release of the final rule.
UAL also commented that the revised referenced service information can mitigate incorrect repairs and blanket installation, and minimize future alternative methods of compliance AMOC requests.
The FAA disagrees with delaying the final rule. Since the publication of the NPRM, the operators existing IPC and AMM have been revised and provide accurate part numbers and corrective action procedures for missing insulation blankets. In addition, an operator unable to accomplish the actions in this AD for any reason may request approval of an AMOC under the provisions of paragraph i1 of this AD, if sufficient data are submitted to substantiate that the change would provide an acceptable level of safety. The FAA has not changed this AD in this regard.
Request To Identify Proper Insulation Blankets UAL expressed concern about the post-compliance maintenance configuration using Boeing Service Bulletin 767250550, Revision 1, dated December 4, 2019, in the absence of a revised Boeing 767 IPC i.e., Boeing 767
IPC sections 252105; 255203; 25

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5252; 255262; 255501 to identify the proper insulation blankets with integrated fire stops. UAL described disagreements in the service information for the identity of the insulation blanket installations and corresponding part numbers in the aft and forward cargo compartment of postmodification airplanes and missing insulation blankets from certain appendixes and figures. UAL stated that it is essential to identify post-service bulletin configurations in certain Boeing 767 IPCs to ensure that AD compliance is maintained and to avoid inadvertent demodification by maintenance technicians. UAL commented that the configuration control for the airplane is the IPC, which maintenance technicians use for proper part replacement, and would alert maintenance personnel of insulation blankets having the integrated fire stops to ensure continued airworthiness.
As the FAA stated previously, since the NPRM was issued, relevant sections of the IPC have been revised. The operators existing IPC contains the accurate part numbers and corrects missing insulation blankets. For clarification, the part numbers for the insulation blankets specified in Boeing Special Attention Service Bulletin 767
250550, dated January 15, 2015, and Boeing Special Attention Service Bulletin 767250550, Revision 1, dated December 4, 2019, are acceptable for installation; the new part numbers requires less work to install. The FAA
has revised paragraph h4 of this AD
accordingly.
In addition, Boeing found that the insulation blankets at certain locations were not affected by the integrated fire stop issue that are addressed in Boeing Special Attention Service Bulletin 767
250550, Revision 1, dated December 4, 2019. Therefore, these insulation blankets were removed from Boeing Special Attention Service Bulletin 767
250550, Revision 1, dated December 4, 2019. Boeing Special Attention Service Bulletin 767250550, Revision 1, dated December 4, 2019, includes work to reinspect the installation of the insulation blankets that were installed in Boeing Special Attention Service Bulletin 767
250550, dated January 15, 2015. Since those insulation blankets that are not affected by the fire stop issue were removed from Boeing Special Attention Service Bulletin 767250550, Revision 1, dated December 4, 2019, there is no need for instructions in Revision 1 to inspect the work that was performed in Boeing Special Attention Service Bulletin 767250550, dated January 15, 2015. The FAA has not changed this AD
in this regard.

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