Airworthiness Directive · Amendment 39-8812 · The Boeing Company Airplanes
The Boeing Company Airplanes
This AD applies to The Boeing Company 747-200B Series, 747-200C Series, 747-300 Series, 747-400 Series, 747-400D Series.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 747-200B, -200C, -300, -400, and 400D series airplanes, that requires a revision to the FAA-approved maintenance program to require unrestricted opening of the passenger service unit (PSU) door during functional testing of the passenger oxygen system; and requires an inspection to detect leaks in certain passenger oxygen system reservoir bags, and marking and replacement of damaged mask assemblies. This amendment is prompted by reports that the passenger oxygen mask reservoir bags became overpressurized and split at the seams, resulting in failure of the bags. The actions specified by this AD are intended to ensure the delivery of emergency oxygen through the passenger oxygen system reservoir mask assemblies.
