Airworthiness Directive · Amendment 39-19322 · Equipment/furnishings
The Boeing Company Airplanes
Superseded. A later AD replaced this one: AD 2020-22-10. Comply with the one in force.
This AD applies to The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes, certificated in any category, as identified in Boeing Special Attention Service Bulletin 777-25-0621, Revision 1, dated August 4, 2017.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes. This AD was prompted by reports that additional areas of Boeing Material Specification (BMS) 8-39 flexible urethane foam were found during a routine inspection. This AD requires an inspection for foam insulation on the dripshield above the overhead panel support structure and replacement if necessary. For certain airplanes, this AD also requires replacement of foam insulation on the overhead panel support structure. We are issuing this AD to address the unsafe condition on these products.
Except as required by paragraph (h) of this AD: At the applicable times specified in paragraph 1.E., “Compliance,” of Boeing Special Attention Service Bulletin 777-25-0621, Revision 1, dated August 4, 2017, do all applicable actions identified as “RC” (required for compliance) in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Service Bulletin 777-25-0621, Revision 1, dated August 4, 2017.
For purposes of determining compliance with the requirements of this AD: Where Boeing Special Attention Service Bulletin 777-25-0621, Revision 1, dated August 4, 2017, uses the phrase “the original issue date of this service bulletin,” this AD requires using “the effective date of this AD.”
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
