Airworthiness Directive 2009-21-10
one-timeAirworthiness Directives; AVOX Systems and B/E Aerospace Oxygen Cylinder Assemblies, as Installed on Various Transport Airplanes
What this AD requires
We are adopting a new airworthiness directive (AD) for certain AVOX Systems and B/E Aerospace oxygen cylinder assemblies, as installed on various transport airplanes. This AD requires removing certain oxygen cylinder assemblies from the airplane. This AD was prompted by the reported rupture of a high-pressure gaseous oxygen cylinder, which had insufficient strength characteristics due to improper heat treatment. We are issuing this AD to prevent an oxygen cylinder from rupturing, which, depending on the location, could result in structural damage and rapid decompression of the airplane, damage to adjacent essential flight equipment, deprivation of the necessary oxygen supply for the flightcrew, and injury to cabin occupants or maintenance or other support personnel.
Which aircraft AD 2009-21-10 applies to
Applies to Type 3HT oxygen cylinder assemblies bearing the listed part numbers; these appliances may be installed on various transport category airplanes (identified in Table 2 of the AD, including Airbus A300/A310/A318/A319/A320/A321/A330/A340 and Boeing 707/727 and other models), certificated in any category.
Whether AD 2009-21-10 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.