AD 93-10-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | GTSIO-520-C | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
| engine | Continental Motors | GTSIO-520-D | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
| engine | Continental Motors | GTSIO-520-E | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
| engine | Continental Motors | GTSIO-520-F | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
| engine | Continental Motors | GTSIO-520-H | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
| engine | Continental Motors | GTSIO-520-K | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
| engine | Continental Motors | GTSIO-520-L | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
| engine | Continental Motors | GTSIO-520-M | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
| engine | Continental Motors | GTSIO-520-N | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
| engine | Continental Motors | IO-360-A | TELEDYNE CONTINENTAL MOTORS Models (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 Series Engines |
Unsafe Condition
Missing cylinder valve retainer key causing engine failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect each cylinder to determine if both valve retainer keys are in place on each valve and if the roto coil, if applicable, is properly positioned. Repair or replace the cylinder if a key is missing or the roto coil is mispositioned. Return engine to service if keys are in place and roto coil is correctly positioned.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required prior to further flight, unless previously accomplished.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Teledyne Continental Motors (TCM) O-200, O-300, IO/TSIO/LTSIO-360, O/IO/TSIO-470, IO/TSIO/LTSIO/GTSIO-520, and IO/TSIO/TSIOL-550 series engines listed by serial number in TCM MSB No. 93-12 or that contain cylinder assemblies purchased from TCM between July 29, 1992, and March 30, 1993.
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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