AD Amdt-39-9977
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Lycoming and Superior Air Parts | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
| engine | Lycoming | and Superior Air Parts | Airworthiness Directives; Textron Lycoming and Superior Air Parts, Inc. |
Unsafe Condition
Cylinder head separation, inflight loss of power, possible engine failure, and fire due to fatigue cracking in the cylinder head of certain Superior Air Parts, Inc. PMA replacement cylinder assemblies installed on Textron Lycoming TIO-540, LTIO-540, and IO-540 series engines.
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Required Actions
Remove from service affected higher time cylinder assemblies and replace with serviceable parts. Perform initial and repetitive dye penetrant inspections on mid-time cylinder assemblies or replace with serviceable parts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Before further flight
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Affected Aircraft
Textron Lycoming TIO-540, LTIO-540, and IO-540 series engines with Superior Air Parts, Inc. PMA replacement cylinder assemblies installed.
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
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