AD 80-22-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | TSIO-520-M | TELEDYNE CONTINENTAL MOTORS ModelsTSIO-520-M, TSIO-520-P, TSIO-520-R Engines |
| engine | Continental Motors | TSIO-520-P | TELEDYNE CONTINENTAL MOTORS ModelsTSIO-520-M, TSIO-520-P, TSIO-520-R Engines |
| engine | Continental Motors | TSIO-520-R | TELEDYNE CONTINENTAL MOTORS ModelsTSIO-520-M, TSIO-520-P, TSIO-520-R Engines |
Unsafe Condition
The crankshaft front oil seal may be dislodged from the engine crankcase, leading to oil leakage and potential engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the crankshaft front oil seal for displacement or oil leakage. Replace the seal if necessary, install two seal half plates with specified bolts, torque bolts to 21-25 in-lbs, reinstall cowl sections with correct baffle seals, run engine to operating temperature, inspect for leaks, and record maintenance.
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Compliance Time
within the next 25 hours time in service after effective date of this AD
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Affected Aircraft
TELEDYNE CONTINENTAL MOTORS TSIO-520-M (serial numbers 511000 through 520187, 230126R through 230129R, 230131R through 230142R, and 230144R through 230146R), TSIO-520-P (serial numbers 513000 through 513620 and 236401R), and TSIO-520-R (serial numbers 512000 through 517961, 230226R, 230228R, 230230R through 230233R, 230235R through 230246R, and 230248R) engines installed in certain Cessna models.
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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