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.
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Required Actions
Discontinue use of oil dilution and disconnect or remove dilution lines until an adequate sludge controlling device is developed and incorporated.
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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
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Federal Register Abstract
Master Rod Bearing Oil Supply
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_52-20-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-20-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: WRIGHT Models C18BA and C18BD Engines Subject: Master Rod Bearing Oil Supply Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Curtiss-Wright/Marquette, Inc. Model: Double Row Cyclone 739C18BA3 | Double Row Cyclone 745C18BA3 | Double Row Cyclone 745C18BA4 | Double ...Show more Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 52-20-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-20-02 SUBJECT HEADING: WRIGHT Models C18BA and C18BD Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 52-20-02 WRIGHT: Applies to All Models C18BA and C18BD Engines. Compliance required as soon as possible but not later than October 31, 1952. To prevent crankpin sludge from washing into the master rod bearing oil supply passages causing failure of the bearing, the use of oil dilution must be discontinued and the dilution lines disconnected or removed. This restriction on oil dilution is to continue until an adequate sludge controlling device is developed and incorporated in these engines. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_52-20-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 52-20-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: WRIGHT Models C18BA and C18BD Engines Subject: Master Rod Bearing Oil Supply Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Curtiss-Wright/Marquette, Inc. Model: Double Row Cyclone 739C18BA3 | Double Row Cyclone 745C18BA3 | Double Row Cyclone 745C18BA4 | Double ...Show more Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 52-20-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 52-20-02 SUBJECT HEADING: WRIGHT Models C18BA and C18BD Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 52-20-02 WRIGHT: Applies to All Models C18BA and C18BD Engines. Compliance required as soon as possible but not later than October 31, 1952. To prevent crankpin sludge from washing into the master rod bearing oil supply passages causing failure of the bearing, the use of oil dilution must be discontinued and the dilution lines disconnected or removed. This restriction on oil dilution is to continue until an adequate sludge controlling device is developed and incorporated in these engines. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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