AD 95-03-14
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | IO-346-A | Airworthiness Directives; Teledyne Continental Motors IO-346, IO-520, and IO-550 Series Reciprocating Engines |
| engine | Continental Motors | IO-346-B | Airworthiness Directives; Teledyne Continental Motors IO-346, IO-520, and IO-550 Series Reciprocating Engines |
| engine | Continental Motors | IO-520-C | Airworthiness Directives; Teledyne Continental Motors IO-346, IO-520, and IO-550 Series Reciprocating Engines |
| engine | Continental Motors | IO-520-CB | Airworthiness Directives; Teledyne Continental Motors IO-346, IO-520, and IO-550 Series Reciprocating Engines |
| engine | Continental Motors | IO-550-C | Airworthiness Directives; Teledyne Continental Motors IO-346, IO-520, and IO-550 Series Reciprocating Engines |
Unsafe Condition
Cracks in the engine mount brackets could result in engine separation from the aircraft.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect lower left engine mount bracket (P/N 630695 or C/N 630724) for cracks using dye penetrant techniques per TCM MSB94-9 within 50 hours time in service after the effective date. Replace cracked brackets with improved designs (P/N 653306 and 653305).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 50 hours time in service after the effective date of this AD
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Affected Aircraft
Teledyne Continental Motors IO-346A, IO-346B, IO-520C, IO-520CB, IO-550C engines with specific serial ranges: rebuilt IO-520C (S/N 287051-R and lower), IO-520CB (S/N 282226-R and lower), IO-550C (S/N 271742-R and lower); factory overhauled engines with build date before August 6, 1992.
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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