AD 71-05-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | IO-360-A1A | AVCO LYCOMING Model IO-360-A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1B | AVCO LYCOMING Model IO-360-A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1B6 | AVCO LYCOMING Model IO-360-A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1C | AVCO LYCOMING Model IO-360-A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A1D6 | AVCO LYCOMING Model IO-360-A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A2A | AVCO LYCOMING Model IO-360-A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A2B | AVCO LYCOMING Model IO-360-A and -C Series Engines |
| engine | Lycoming Engines | IO-360-A2C | AVCO LYCOMING Model IO-360-A and -C Series Engines |
| engine | Lycoming Engines | IO-360-C1A | AVCO LYCOMING Model IO-360-A and -C Series Engines |
| engine | Lycoming Engines | IO-360-C1B | AVCO LYCOMING Model IO-360-A and -C Series Engines |
Unsafe Condition
Shifting and possible failures of the crankcase main bearings
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Required Actions
Inspect lubrication system for metal contaminants at specified intervals. If contaminants detected, remove number two cylinder to examine bearing position. Modify crankcase per service instructions or install straight dowels to eliminate inspections.
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Compliance Time
Within 10 hours in service after effective date for initial inspection; subsequent intervals depend on engine hours since new/overhaul (every 25 hours until 525 hours, then comply with (d) or (f); engines over 1150 hours must comply with (f) within 50 hours)
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Affected Aircraft
AVCO LyCOMING Model IO-360-A and -C series engines except S/N 7100-51A and subsequent, and engines overhauled by Lycoming after 26 January 1970 except specific listed serial numbers
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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