Is AD 2009-21-10 a recurring Airworthiness Directive?

No — AD 2009-21-10 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2009-21-10 apply to?

AD 2009-21-10 applies to Avox Systems, B/E Aerospace. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2009-21-10

one-time

Official AD 2009-21-10 · FR doc 2010-937 · 2010-01-20 · appliance

Airworthiness Directives; AVOX Systems and B/E Aerospace Oxygen Cylinder Assemblies, as Installed on Various Transport Airplanes

What this AD requires

The FAA is revising an existing airworthiness directive (AD), which applies to certain AVOX Systems and B/E Aerospace oxygen cylinder assemblies, as installed on various transport airplanes. That AD currently requires removing certain oxygen cylinder assemblies from the airplane. This AD removes certain oxygen cylinder part numbers from the applicability. 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

MakesAvox SystemsB/E Aerospace

Part-conditional — 6350A34 series, 800112-03, 800112-10, 800112-13, 801293-03, 801307-00, 801307-01, 801307-02.

Applies to oxygen cylinder assemblies (Type 3HT cylinders per US DOT regulations) with the listed manufacturer part numbers (AVOX Systems and B/E Aerospace, per Table 1 of the AD). These cylinders may be installed on various transport airplanes, certificated in any category, including but not limited to Airbus A300/A310/A318/A319/A320/A321/A330/A340, Boeing 707/727/737/747/757/767/777, Gulfstream G-IV, and McDonnell Douglas DC-8 models (per Table 2 of the AD).

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:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.

Date — When the work was done.

Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.

Signature & certificate — The A&P/IA who returned it to service, with certificate number.

Is AD 2009-21-10 complied with on your aircraft?

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.