AD 84-13-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | AEIO-360-A1A | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
| engine | Lycoming Engines | AEIO-360-A1B | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
| engine | Lycoming Engines | AEIO-360-A1B6 | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
| engine | Lycoming Engines | AEIO-360-A1C | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
| engine | Lycoming Engines | AEIO-360-A1D | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
| engine | Lycoming Engines | AEIO-360-A1E | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
| engine | Lycoming Engines | AEIO-360-A2A | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
| engine | Lycoming Engines | AEIO-360-A2B | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
| engine | Lycoming Engines | AEIO-360-A2C | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
| engine | Lycoming Engines | AEIO-360-B1B | AVCO LYCOMING Models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B; AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A Engines |
Unsafe Condition
The possibility of in-flight propeller flange separation due to potential crankshaft flange defects.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the crankshaft flange every 25 hours time in service using a 10 power magnifying glass, or perform Magnaflux inspection every 100 hours time in service. Alternatively, replace the crankshaft with a redesigned version to discontinue inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 25 hours time in service
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
AVCO Lycoming engines models AIO-360-A1A, -A2A, -A1B, -A2B, -B1B (serials up to L-257-63A); AEIO-360-A1A, -A1B, -A1B6, -A2A, -A1C, -A2C, -A1D, -A1E, -A2B, -B1B, -B1D, -B1F, -B1F6, -B2F, -B2F6, -B4A, -H1A (serials up to L-23521-51A). Includes remanufactured engines shipped before June 1, 1983.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.