AD 77-08-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mooney Aviation Company Inc | M20E | Airworthiness Directives; Mooney Model M20E, M20F, and M20J Airplanes |
| aircraft | Mooney Aviation Company Inc | M20F | Airworthiness Directives; Mooney Model M20E, M20F, and M20J Airplanes |
| aircraft | Mooney Aviation Company Inc | M20J | Airworthiness Directives; Mooney Model M20E, M20F, and M20J Airplanes |
Unsafe Condition
The Stewart-Warner Model 8432H (S/N 001 and Up) and 8432F (S/N 1610 through 1717) engine oil coolers may fail, leading to loss of engine oil.
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Required Actions
Before the next flight, remove the engine cowl and visually check the oil cooler model and serial numbers. If the cooler is not the suspect model/serial numbers, record the inspection and return to service. If it is the suspect model, replace it with a serviceable Stewart-Warner Model 8432F-1 oil cooler before further flight, except under FAR 21.197.
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Compliance Time
prior to further flight after the effective date of this AD except that the airplane may be flown in accordance with FAR 21.197 to a base where the removal can be performed
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Affected Aircraft
Mooney Model M20E (serial numbers 101 through 466, 470 through 1217, 1219, 1221, 1223 through 1308, 670001 through 670062, 690001 through 690073, 700001 through 700039, 700041 through 700043, 700045 through 700052, 700055, 700056, 700060, 700061, 21-0001 through 21-1180); M20F (serial numbers 670001 through 670363, 670365 through 670385, 670387 through 670482, 670484 through 670539, 680001 through 680206, 690001 through 690090, 690092, 700001 through 700061, 700063, 700066 through 700070, 700072, 22-0001 through 22-1437); M20J (serial numbers 24-0001 through 24-0237)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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