AD 87-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | IO-520-BA | TELEDYNE CONTINENTAL MOTORS (TCM) Model IO-520, IO-550, and TSIO-520 Series Engines |
| engine | Continental Motors | IO-520-BB | TELEDYNE CONTINENTAL MOTORS (TCM) Model IO-520, IO-550, and TSIO-520 Series Engines |
| engine | Continental Motors | IO-550-B | TELEDYNE CONTINENTAL MOTORS (TCM) Model IO-520, IO-550, and TSIO-520 Series Engines |
| engine | Continental Motors | TSIO-520-BE | TELEDYNE CONTINENTAL MOTORS (TCM) Model IO-520, IO-550, and TSIO-520 Series Engines |
| engine | Continental Motors | TSIO-520-LB | TELEDYNE CONTINENTAL MOTORS (TCM) Model IO-520, IO-550, and TSIO-520 Series Engines |
| engine | Continental Motors | TSIO-520-UB | TELEDYNE CONTINENTAL MOTORS (TCM) Model IO-520, IO-550, and TSIO-520 Series Engines |
| engine | Continental Motors | TSIO-520-WB | TELEDYNE CONTINENTAL MOTORS (TCM) Model IO-520, IO-550, and TSIO-520 Series Engines |
Unsafe Condition
Starter adapter shaftgear failure could result in loss of lubricating oil and subsequent complete loss of engine power.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Determine if a freon compressor is installed. If installed, check engine compliance with AD 87-12-12 and time in service of starter adapter shaftgear P/N 649343. Depending on engine type (new or rebuilt) and inspection results, remove and replace starter adapter assembly P/N 642087 with manufacturer's replacement, inspect drive sheave attaching nut and shaft, and make logbook entry.
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
TELEDYNE CONTINENTAL MOTORS (TCM) Model IO-520, IO-550, and TSIO-520 series engines with starter adapter shaftgear P/N 649343, a freon compressor, and 25 hours or less time in service installed on specified serial numbers listed in the AD.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.