AD 49-40-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Double Wasp CA15 | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
| engine | Pratt & Whitney Division | Double Wasp CA18 | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
| engine | Pratt & Whitney Division | Double Wasp CA3 | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
| engine | Pratt & Whitney Division | Double Wasp CA5 | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
| engine | Pratt & Whitney Division | Military R-2800 Series | PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines |
Unsafe Condition
Failure of the supercharger impeller thrust bearing could result in complete loss of power.
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Required Actions
Install a new thrust plate P/N 127770 with larger (No. 51) oil feed holes and rework the P/N 84012 thrust spacer to incorporate circumferential oil skates. Follow Pratt & Whitney Service Bulletin No. 892, Revision B.
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Compliance Time
at next overhaul but in no case later than March 1, 1950
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Affected Aircraft
Pratt & Whitney Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines
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Federal Register Abstract
Thrust Plate
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_49-40-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-40-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -...Show more Subject: Thrust Plate Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Pratt & Whitney Division Model: Double Wasp CA15 | Double Wasp CA18 | Double Wasp CA3 | Double Wasp CA5 | Military R-2800 Series 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: 49-40-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-40-02 SUBJECT HEADING: PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-40-02 PRATT & WHITNEY: Applies to Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines. To be accomplished at next overhaul but in no case later than March 1, 1950. To preclude the possibility of complete loss of power as a result of failure of the supercharger impeller thrust bearing, the engine must be modified to incorporate a new thrust plate P/N 127770 with larger (No. 51) oil feed holes. Also P/N 84012 thrust spacer must be reworked to incorporate circumferential oil skates. Details off this modification and rework are given in Pratt & Whitney Service Bulletin No. 892, Revision B. As a precautionary measure, it is recommended that the engine be operated with minimum use of high ratio supercharger and that particular attention be directed toward keeping oil sludge to a minimum until the above modification has been accomplished. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_49-40-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 49-40-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -...Show more Subject: Thrust Plate Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Pratt & Whitney Division Model: Double Wasp CA15 | Double Wasp CA18 | Double Wasp CA3 | Double Wasp CA5 | Military R-2800 Series 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: 49-40-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 49-40-02 SUBJECT HEADING: PRATT & WHITNEY Models Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 49-40-02 PRATT & WHITNEY: Applies to Double Wasp CA Series (-3, -5, -15, -18) and Military R-2800-C Series (-22, -22W, -34, -34W, -57, -73, -77, -81, -83, -85) Engines. To be accomplished at next overhaul but in no case later than March 1, 1950. To preclude the possibility of complete loss of power as a result of failure of the supercharger impeller thrust bearing, the engine must be modified to incorporate a new thrust plate P/N 127770 with larger (No. 51) oil feed holes. Also P/N 84012 thrust spacer must be reworked to incorporate circumferential oil skates. Details off this modification and rework are given in Pratt & Whitney Service Bulletin No. 892, Revision B. As a precautionary measure, it is recommended that the engine be operated with minimum use of high ratio supercharger and that particular attention be directed toward keeping oil sludge to a minimum until the above modification has been accomplished. FOOTER:
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.
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