AD 2004-05-24
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines |
Unsafe Condition
Failure of zinc-plated crankshaft gear retaining bolts could lead to loss of all engine power and possible forced landing.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace zinc-plated crankshaft gear retaining bolts using one of the specified kits. The AD expands the affected engine population and adds five additional kits as alternative methods of compliance.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Lycoming Engines (formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 series reciprocating engines, including 161 engines not previously identified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.