AD 84-19-03 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Lycoming Engines | LTIO-540-V2AD | AVCO LYCOMING Model TIO-540-V2AD and LTIO-540-V2AD Engines |
| engine | Lycoming Engines | TIO-540-V2AD | AVCO LYCOMING Model TIO-540-V2AD and LTIO-540-V2AD Engines |
Unsafe Condition
Cracks have occurred in the area of the intake valve seat of the cylinder head in Avco Lycoming model TIO-540-V2AD and LTIO-540-V2AD engines with P/N LW-18852 cylinder assemblies.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace all P/N LW-18852 cylinder assemblies with P/N LW-19281 cylinder assemblies from kit P/N LW-19297-S within the next 50 hours of time-in-service after the effective date or prior to accumulating 550 hours time-in-service, whichever occurs later. The aircraft may be flown to a location for compliance under FAR 21.197 and 21.199. Equivalent compliance may be approved by the Manager, New York Aircraft Certification Office.
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Compliance Time
Within the next 50 hours of time-in-service after the effective date of this AD, or prior to accumulating 550 hours time-in-service, whichever occurs later
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Affected Aircraft
Avco Lycoming model TIO-540-V2AD engines Serial Numbers L-8620-61A and below and model LTIO-540-V2AD Serial Numbers L-2820-68A and below with P/N LW-18852 cylinder assemblies installed in Piper PA-31P-350 'Mojave' aircraft.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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