AD 77-18-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Mooney Aviation Company Inc | M20E | Airworthiness Directives; Mooney Models M20E, M20F, and M20J Airplanes |
| aircraft | Mooney Aviation Company Inc | M20F | Airworthiness Directives; Mooney Models M20E, M20F, and M20J Airplanes |
| aircraft | Mooney Aviation Company Inc | M20J | Airworthiness Directives; Mooney Models M20E, M20F, and M20J Airplanes |
Unsafe Condition
Overheating of engine oil due to the presence of a 'V' notch on the fourth and/or fifth plate of the Stewart-Warner model 8432F1 oil cooler on Mooney Models M20E, M20F, and M20J airplanes.
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Required Actions
Visually check the engine oil cooler for a 'V' notch between the center welds and edge notches as shown in Figure I. If a 'V' notch is found on the fourth and/or fifth plate on the side with oil ports and not on the opposite side, record compliance. Otherwise, replace the oil cooler with an airworthy Stewart-Warner model 8432F1 before further flight.
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Compliance Time
before further flight
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Affected Aircraft
Mooney Models 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, 24-0241, 24-0242, 24-0245, 24-0248 through 24-0255) with a Stewart-Warner model 8432F1 oil cooler.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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