AD 91-19-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Continental Motors | 6-285-A | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
| engine | Continental Motors | 6-285-B | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
| engine | Continental Motors | 6-285-BA | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
| engine | Continental Motors | 6-285-C | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
| engine | Continental Motors | 6-285-CA | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
| engine | Continental Motors | GTSIO-520-C | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
| engine | Continental Motors | GTSIO-520-D | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
| engine | Continental Motors | GTSIO-520-E | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
| engine | Continental Motors | GTSIO-520-F | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
| engine | Continental Motors | GTSIO-520-H | TELEDYNE CONTINENTAL MOTORS (TCM) Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 Series Engines |
Unsafe Condition
Operation with collapsed oil filter elements can result in loss of oil pressure, engine power loss or engine failure, and possible aircraft damage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the engine oil filter to determine if it is a Champion Part No. CH48108 or CH48109. If so, inspect the filter's date code and remove any filter with specified date codes (e.g., all three-digit codes ending with '9' or specific codes like 3J8, 4J8, etc.) prior to further flight. Replace removed filters with approved alternatives not listed in the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
prior to September 30, 1991
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
TCM Models IO-360, L/TSIO-360, IO-346, L/I/O-470, TSIO-470, IO-520, L/TSIO-520, 6-285, IO-550, and GTSIO-520 series engines installed on specified Beech, Musketeer, Cessna, Mooney, and Piper models with specific serial ranges.
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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