AD 57-06-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Pratt & Whitney Division | Wasp Major B13 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major B14 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major B5 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major B6 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major B7 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major CB2 | PRATT & WHITNEY Model Wasp Major Engines |
| engine | Pratt & Whitney Division | Wasp Major TSB3-G | PRATT & WHITNEY Model Wasp Major Engines |
Unsafe Condition
Propeller shaft oil transfer bearing failures due to inadequate brazing of the propeller shaft oil transfer tube adapter to the bearing, leading to loss of propeller control and inability to feather affected propellers.
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Required Actions
X-ray the brazed joints to determine brazing adequacy, subject the bearing to 1,500 p.s.i. hydraulic pressure test, and conduct a dye penetrant inspection. If the bearing fails inspections, repair or replace it. Alternatively, install new bearing P/N 341627 which eliminates brazed joints.
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Compliance Time
As soon as possible but not later than May 31, 1957.
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Affected Aircraft
Pratt & Whitney Model Wasp Major engines, including models B13, B14, B5, B6, B7, CB2, and others as listed in the source.
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Federal Register Abstract
Propeller Shaft Oil Transfer Bearing
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_57-06-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 57-06-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY Model Wasp Major Engines Subject: Propeller Shaft Oil Transfer Bearing Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Pratt & Whitney Division Model: Wasp Major B13 | Wasp Major B14 | Wasp Major B5 | Wasp Major B6 | Wasp Major B7 | Wasp Major CB2 | W...Show more Product Type: Engine Product Subtype: Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 57-06-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 57-06-03 SUBJECT HEADING: PRATT & WHITNEY Model Wasp Major Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 57-06-03 PRATT & WHITNEY: Applies to All Wasp Major Engines. Compliance required as soon as possible but not later than May 31, 1957. As a result of propeller shaft oil transfer bearing failures, several cases of loss of propeller control occurred which make it impossible to feather the affected propellers. It has been determined that brazing of the propeller shaft oil transfer tube adapter to the propeller shaft oil transfer bearing is subject to failure if the brazing is not adequate. To assure that the brazed joint is satisfactory, the following inspection must be accomplished on bearings with brazed oil tube transfer adapters: 1. X-ray the brazed joints to determine if brazing is satisfactory (limits established by Pan American World Airways and/or Pratt & Whitney Aircraft.) 2. Subject the bearing to 1,500 p.s.i. hydraulic pressure test. 3. Conduct a dye penetrant inspection of the brazed joints. If the bearing does not pass these inspections it must be repaired or replaced. A new bearing, P/N 341627, which has eliminated the brazed joints is available and may be used. This new bearing does not require the above mandatory inspections. Information on inspection procedure and limitation is available from Pratt & Whitney Aircraft. FOOTER:
Document Text
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AD Final Rules - DRS_57-06-03.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 57-06-03 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: PRATT & WHITNEY Model Wasp Major Engines Subject: Propeller Shaft Oil Transfer Bearing Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Pratt & Whitney Division Model: Wasp Major B13 | Wasp Major B14 | Wasp Major B5 | Wasp Major B6 | Wasp Major B7 | Wasp Major CB2 | W...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: 57-06-03 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 57-06-03 SUBJECT HEADING: PRATT & WHITNEY Model Wasp Major Engines ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 57-06-03 PRATT & WHITNEY: Applies to All Wasp Major Engines. Compliance required as soon as possible but not later than May 31, 1957. As a result of propeller shaft oil transfer bearing failures, several cases of loss of propeller control occurred which make it impossible to feather the affected propellers. It has been determined that brazing of the propeller shaft oil transfer tube adapter to the propeller shaft oil transfer bearing is subject to failure if the brazing is not adequate. To assure that the brazed joint is satisfactory, the following inspection must be accomplished on bearings with brazed oil tube transfer adapters: 1. X-ray the brazed joints to determine if brazing is satisfactory (limits established by Pan American World Airways and/or Pratt & Whitney Aircraft.) 2. Subject the bearing to 1,500 p.s.i. hydraulic pressure test. 3. Conduct a dye penetrant inspection of the brazed joints. If the bearing does not pass these inspections it must be repaired or replaced. A new bearing, P/N 341627, which has eliminated the brazed joints is available and may be used. This new bearing does not require the above mandatory inspections. Information on inspection procedure and limitation is available from Pratt & Whitney Aircraft. 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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