Airworthiness Directive · Amendment 39-21607 · Equipment/furnishings
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-300ER series airplanes, certificated in any category, as identified in Boeing Special Attention Requirements Bulletin 777-25-0753 RB, dated July 31, 2020.
The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777-300ER series airplanes. This AD was prompted by a report that a production design change to certain insulation blankets inadvertently opened up leakage paths for halon and smoke to escape from the aft cargo compartment in the event of a fire. This AD requires installation of an insulation blanket assembly on top of existing insulation blankets in certain areas of the forward endwall in the aft cargo compartment. The FAA is issuing this AD to address the unsafe condition on these products.
Except as specified by paragraph (h) of this AD: At the applicable times specified in the “Compliance” paragraph of Boeing Special Attention Requirements Bulletin 777-25-0753 RB, dated July 31, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Special Attention Requirements Bulletin 777-25-0753 RB, dated July 31, 2020.
Note 1 to paragraph (g): Guidance for accomplishing the actions required by this AD can be found in Boeing Special Attention Service Bulletin 777-25-0753, dated July 31, 2020, which is referred to in Boeing Special Attention Requirements Bulletin 777-25-0753 RB, dated July 31, 2020.
Where Boeing Special Attention Requirements Bulletin 777-25-0753 RB, dated July 31, 2020, uses the phrase “the original issue date of the Requirements Bulletin 777-25-0753 RB,” 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.
