AD 47-14-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | S-307 | BOEING 307 Series Aircraft |
| aircraft | The Boeing Company | SA-307B | BOEING 307 Series Aircraft |
| aircraft | The Boeing Company | SA-307B-1 | BOEING 307 Series Aircraft |
Unsafe Condition
The keys in the main landing gear motors attachment to the retracting unit may not be heat treated to 200,000-220,000 pounds per square inch, leading to potential failure of the attachment.
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Required Actions
Inspect the attachment of the main landing gear motors to the retracting unit. Test the keys to determine if they meet the 200,000-220,000 psi heat treatment specification. Replace keys that do not meet the specification.
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Compliance Time
prior to May 15, 1947
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Affected Aircraft
The Boeing Company S-307, SA-307B, SA-307B-1 aircraft models. Aircraft with an additional gearbox for the hand retracting drive are excluded.
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Federal Register Abstract
Main Landing Gear Motors
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-14-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-14-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING 307 Series Aircraft Subject: Main Landing Gear Motors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: S-307 | SA-307B | SA-307B-1 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-14-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-14-02 SUBJECT HEADING: BOEING 307 Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-14-02 BOEING: (Was Mandatory Note 3 of AD-719-1 and Mandatory Note 3 of AD-726- 1.) Applies to 307 Series Aircraft. Compliance required prior to May 15, 1947. Inspect the attachment of the main landing gear motors to the retracting unit. Determine, by testing, that the keys in these locations have been heat treated to 200,000-220,000 pounds per square inch. All keys that do not meet this strength specification should be replaced. Aircraft which have had this attachment revised to include an additional gearbox for the hand retracting drive are not subject to this inspection. (TWA E.O. No 3489 covers this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_47-14-02.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-14-02 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING 307 Series Aircraft Subject: Main Landing Gear Motors Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: The Boeing Company Model: S-307 | SA-307B | SA-307B-1 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-14-02 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-14-02 SUBJECT HEADING: BOEING 307 Series Aircraft ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-14-02 BOEING: (Was Mandatory Note 3 of AD-719-1 and Mandatory Note 3 of AD-726- 1.) Applies to 307 Series Aircraft. Compliance required prior to May 15, 1947. Inspect the attachment of the main landing gear motors to the retracting unit. Determine, by testing, that the keys in these locations have been heat treated to 200,000-220,000 pounds per square inch. All keys that do not meet this strength specification should be replaced. Aircraft which have had this attachment revised to include an additional gearbox for the hand retracting drive are not subject to this inspection. (TWA E.O. No 3489 covers this same subject.) FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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