AD 72-24-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | IO-360-A | TELEDYNE CONTINENTAL Models IO-346-A, IO-520-B and -C and TSIO 520-B, -E, and -J Engines |
| engine | Continental Motors | IO-520-B | TELEDYNE CONTINENTAL Models IO-346-A, IO-520-B and -C and TSIO 520-B, -E, and -J Engines |
| engine | Continental Motors | IO-520-C | TELEDYNE CONTINENTAL Models IO-346-A, IO-520-B and -C and TSIO 520-B, -E, and -J Engines |
| engine | Continental Motors | TSIO-520-B | TELEDYNE CONTINENTAL Models IO-346-A, IO-520-B and -C and TSIO 520-B, -E, and -J Engines |
| engine | Continental Motors | TSIO-520-E | TELEDYNE CONTINENTAL Models IO-346-A, IO-520-B and -C and TSIO 520-B, -E, and -J Engines |
| engine | Continental Motors | TSIO-520-J | TELEDYNE CONTINENTAL Models IO-346-A, IO-520-B and -C and TSIO 520-B, -E, and -J Engines |
Unsafe Condition
Cracks in the oil filter adapter face and improper gasket seating could lead to oil leaks and loss of oil, resulting in engine failure.
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Required Actions
Replace the oil filter adapter with Part Number 632881 or AC 5579663 by next engine overhaul. Inspect the base plate gasket seat within 25 hours' time in service and replace if wedge-shaped. Perform visual inspections for cracks and proper installation procedures including gasket lubrication, torque specifications, and leak checks within 25 hours' time in service and after each oil filter change.
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Compliance Time
Not later than next engine overhaul for paragraph (A); within 25 hours' time in service for paragraphs (B) and (C); and at every oil filter element change thereafter for paragraph (C)(1) and (C)(2).
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Affected Aircraft
Teledyne Continental Models IO-346-A, IO-520-B, IO-520-C, TSIO-520-B, TSIO-520-E, TSIO-520-J engines with Part Number 631645 oil filter adapter installed, used with AC OF-9-A oil filter assembly.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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