63-01-01 GRUMMAN: Amdt. 526 Part 507 Federal Register January 5, 1963. Applies to Model G-164 Aircraft Serial Numbers 101 Through 150 Inclusive.
Compliance required within the next 50 hours' time in service after the effective date of the AD.
As a result of an investigation of engine mount washers (P/N S-136-1-D), which had failed, installed on Model G-164 aircraft, Serial Numbers 101 through 150 inclusive, it has been established that the engine mount washers presently installed on these aircraft do not conform to the approved Grumman specifications.
To preclude the possibility of an engine loss due to these washers, accomplish either (a) or (b):
(a) (1) Replace the presently installed engine mount washers, P/N S-136-1-D with washers (16 required) furnished by Grumman, that meet the detail drawing P/N S-136-1-D.
(2) CAUTION: The replacement washers furnished by Grumman have the same part number as the washers presently installed on the aircraft.
(Grumman Service Bulletin No. 21 covers this same subject.)
(b) Replace the presently installed engine mount washers, P/N S-136-1-D with washers (16 required) made from 2017T-T4 aluminum alloy, QQ-A-351e or QQ-A-00225/5 anodized per Spec. MIL-A-8625A which have the following geometric dimensions:
0.125-inch + 0.010 thick x 1 3/4-inches + 1/64 outside diameter with a center drilled 25/64-inch + 0.008 or 0.001 diameter hole.
This directive effective January 5, 1963.