AD 81-03-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | IGO-540-A1A | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
| engine | Lycoming Engines | IGO-540-B1A | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
| engine | Lycoming Engines | IGO-540-B1C | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
| engine | Lycoming Engines | IGSO-480-A1E6 | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
| engine | Lycoming Engines | IGSO-540-A1A | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
| engine | Lycoming Engines | IGSO-540-A1C | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
| engine | Lycoming Engines | IGSO-540-A1D | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
| engine | Lycoming Engines | IGSO-540-A1E | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
| engine | Lycoming Engines | IGSO-540-A1H | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
| engine | Lycoming Engines | IO-540-A1A5 | AVCO LYCOMING Model IGSO-480-A1E6; IO-540-A1A5; IO-540-B1C5; IO-540-K1E5; IGO-540-A1A; IGO-540-A1A, -B1A, - B1C; IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H Engines |
Unsafe Condition
Fuel leakage in the mixture control shaft assembly on Bendix Model RS-10FB1, RS-10ED1, RS-10ED2, RS-10B1 and RS-10B2 fuel injectors.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the mixture control shaft assembly with new parts per Bendix Service Bulletin RS-62, Rev. 1, dated 2/14/80, or FAA approved equivalent. Reidentify all modified fuel injectors per the Service Bulletin instructions. Equivalent methods require approval by the Chief, Engineering and Manufacturing Branch, FAA Eastern Region.
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Compliance Time
within the next 50 hours' in service after the effective date of this AD, unless already accomplished
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Affected Aircraft
AVCO Lycoming engines: IGSO-480-A1E6 (S/Ns up to L-2066-44); IO-540-A1A5 (S/Ns up to L-19212-48); IO-540-B1C5 (S/Ns up to L-9631-48); IO-540-K1E5 (S/Ns up to L-19698-48A); IGO-540-A1A, -B1A, -B1C (S/Ns up to L-339-49); IGSO-540-A1A, -A1C, -A1D, -A1E, -A1H (S/Ns up to L-3637-50)
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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