Quote from New Zealand Airworthiness Schedule DCA/EMY/27A,24 May 2008
Oxygen Reserve Cylinders-Inspection & Replacement
To prevent oxygen cylinders exploding due to aging and deterioration of the
Aluminium Alloy 5283 (AA5283) cylinder shell material, identify the year of
manufacture of each affected P/N oxygen reserve cylinder made from AA5283 and
replace per the instructions in Eurocopter AS 350 Alert Service Bulletin No. 05.00.54.
Immediately after removing the oxygen cylinder from the aircraft, empty the cylinder
per the instructions in Intertechnique Service Bulletin (SB) GLD/GLF-35-150 dated 20
September 2006.
Note 3: Oxygen cylinders with P/Ns listed in this AD may only be used if the service life is
within the limitations of the compliance of this AD.
Note 4: Oxygen cylinders with P/Ns listed in this AD and which are held as spares are to be
inspected per the requirements of this AD. Identify the year of manufacture of the
cylinder and empty all oxygen reserve cylinders that have reached or exceeded 25
years after manufacture, per the instructions in Intertechnique SB GLD/GLF-35-150.
(EASA AD 2006-0286R1 refers)
Compliance: Within the next 15 days if the TIS cannot positively be established.
When operated in salt-laden atmospheric conditions:
At 15 years since manufacture, or within 15 days whichever occurs later.
When operated in normal climatic conditions:
At 25 years since manufacture, or within 12 months whichever occurs later.