71-02-01 AIR CRUISERS COMPANY LIFE RAFTS: Amdt. 39-1142. Applies to Air Cruisers Company Division of Garrett Corp. Life Raft Models 12D11751-7, 12D11751-8, and 18D23350-5.
Compliance required as indicated.
To prevent loss of pressure in the inflation bottles on the rafts, accomplish the following:
(a) Within 100 hours in service after the effective date of this AD, but not later than 100 hours in service since the last pressure check of the cylinder and valve assembly, unless the modification described in subparagraph (1) or (2) below has been accomplished, perform a pressure check of the cylinder and valve assembly, P/Ns 24C17382-1 and 24C17382-2. When pressure measures less than 2600 psig in the former, or less than 2000 psig in the latter, both at 70 degrees F, or an equivalent pressure at other temperatures, before return to service, accomplish the following:
Disassemble the inflation valve assembly, P/N 24D29261-1, and inspect for corrosion in the 0-ring areas.
1. If no corrosion is found, replace the O-rings, in accordance with Air Cruisers Co. Service Bulletin 111-70-1, dated 18 December 1970.
2. If corrosion is found, either:
(i) Strip and alodine the valve body, and replace the O-rings as described in para. (a)(1), or
(ii) Replace the valve with P/N 24D29261-2, modified in accordance with Air Cruisers Co. Service Bulletin 111-70-1, dated 18 December 1970.
(b) For those assemblies which have been modified in accordance with para. (a)(1) or (a)(2)(i) prior to the effective date of this AD, repeat the procedure described in para. (a) within 1800 hours in service after the last inspection.
(c) Following the initial inspection pursuant to this AD, and until the modification described in para. (a)(2)(ii) is accomplished:
1. For assemblies which did not demonstrate a pressure drop, repeat the procedure of para. (a) every 100 hours in service thereafter.
2. For assemblies which did demonstratea pressure drop and which were modified pursuant to para. (a)(1) or (a)(2)(i), reinspect every 1800 hours in service thereafter.
This amendment is effective January 14, 1971.