AD 2006-20-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming | Engines 360 and 540 series reciprocating | Airworthiness Directives; Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-720 Series Reciprocating Engines. |
Unsafe Condition
Failure of the crankshaft, which will result in total engine power loss, in-flight engine failure, and possible loss of the aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace certain crankshafts as identified in Lycoming Mandatory Service Bulletin (MSB) No. 569A. The replacement must occur at the earliest of maintenance involving crankcase separation, the time-in-service specified in Lycoming Engines Service Instruction (SI) No. 1009AS for engine overhaul, or 12 years from the time the crankshaft first entered service.
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Compliance Time
Within 12 years from when the crankshaft entered service, or earlier if maintenance requires splitting the crankcase or the engine reaches the overhaul interval specified in Lycoming SI No. 1009AS.
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Affected Aircraft
Lycoming Engines (L)O-360, (L)IO-360, AEIO-360, O-540, IO-540, AEIO-540, (L)TIO-540, IO-580, and IO-720 series reciprocating engines with crankshafts listed in Lycoming MSB No. 569A.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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