AD 52-20-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Curtiss-Wright/Marquette, Inc. | Double Row Cyclone 739C18BA3 | WRIGHT Models C18BA and C18BD Engines |
| engine | Curtiss-Wright/Marquette, Inc. | Double Row Cyclone 745C18BA3 | WRIGHT Models C18BA and C18BD Engines |
| engine | Curtiss-Wright/Marquette, Inc. | Double Row Cyclone 745C18BA4 | WRIGHT Models C18BA and C18BD Engines |
| engine | Curtiss-Wright/Marquette, Inc. | Double Row Cyclone 749C18BD1 | WRIGHT Models C18BA and C18BD Engines |
| engine | Curtiss-Wright/Marquette, Inc. | Double Row Cyclone 749C18BD3 | WRIGHT Models C18BA and C18BD Engines |
Unsafe Condition
Crankpin sludge washing into the master rod bearing oil supply passages causing bearing failure.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Discontinue use of oil dilution and disconnect or remove dilution lines until an adequate sludge controlling device is developed and incorporated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
as soon as possible but not later than October 31, 1952
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Affected Aircraft
Curtiss-Wright/Marquette, Inc. Double Row Cyclone 739C18BA3, 745C18BA3, 745C18BA4, and other models under WRIGHT Models C18BA and C18BD Engines
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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