Airworthiness Directive · Amendment 39-19346 · Equipment/furnishings
The Boeing Company Airplanes
This AD applies to The Boeing Company airplanes, certificated in any category, as identified in paragraphs (c)(1), (c)(2), and (c)(3) of this AD.
(1) Model 747-100, -100B, -100B SUD, -200B, -200C, -200F, -300, -400, -400D, 747SP, and 747SR series airplanes, as identified in Boeing Special Attention Service Bulletin 747-53-2877, dated August 5, 2014.
(2) Model 747-400, -400D, and 747-8 series airplanes, as identified in Boeing Special Attention Service Bulletin 747-25-3646, Revision 1, dated August 2, 2017.
(3) Model 747-100, -100B, -100B SUD, -200B, -300, 747SP, and 747SR series airplanes, as identified in Boeing Special Attention Service Bulletin 747-25-3692, dated June 22, 2016.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 747-100, -100B, -100B SUD, -200B, -200C, - 200F, -300, -400, -400D, 747SP, and 747SR, and 747-8 series airplanes. This AD was prompted by reports indicating that additional areas of Boeing Material Specification (BMS) 8-39 flexible urethane foam were found during an inspection required by a related AD. This AD requires inspecting for BMS 8-39 flexible urethane foam insulation in the floor panel assemblies and the power drive unit (PDU) cover assemblies, doing applicable on-condition actions, modifying certain dripshields, and replacing BMS 8-39 foam strips on certain dripshields with BMS 8-371 foam strips. We are issuing this AD to address the unsafe condition on these products.
Within 72 months after the effective date of this AD, do all actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of the applicable service information identified in paragraphs (g)(1), (g)(2), and (g)(3) of this AD.
(1) For airplanes identified in paragraph (c)(1) of this AD: Boeing Special Attention Service Bulletin 747-53-2877, dated August 5, 2014.
(2) For airplanes identified in paragraph (c)(2) of this AD: Boeing Special Attention Service Bulletin 747-25-3646, Revision 1, dated August 2, 2017.
(3) For airplanes identified in paragraph (c)(3) of this AD: Boeing Special Attention Service Bulletin 747-25-3692, dated June 22, 2016.
