AD 47-10-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
The elevator booster shifter horn assembly's teeth on 278488 gear may have insufficient width due to inadequate manufacturing tolerances, leading to potential gear tooth failure.
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Required Actions
Rework the elevator booster shifter horn assembly by reducing the width of the teeth on 278488 gear by 0.120 inch from each end of all teeth.
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Compliance Time
prior to August 9, 1946
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Affected Aircraft
Lockheed Aircraft Corporation Model 49 serial numbers 1975 to 1978, inclusive; 1980; and 2021 to 2059, inclusive.
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Federal Register Abstract
Elevator Booster Shifter Horn
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_47-10-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-10-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 49 Subject: Elevator Booster Shifter Horn Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 49-46 Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 47-10-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-10-08 SUBJECT HEADING: LOCKHEED Model 49 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-10-08 LOCKHEED: (Was Mandatory Note 9 of AD-763-3.) Applies Only to Model 49 Serial Numbers 1975 to 1978, Inclusive; 1980; and 2021 to 2059, Inclusive. Compliance required prior to August 9, 1946. Rework the elevator booster shifter horn assembly by reducing the width of the teeth on 278488 gear. 0.120 inch should be removed from each end of all the teeth. (LAC Service Bulletin 049/SB-19 covers this same subject.) FOOTER:
Document Text
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AD Final Rules - DRS_47-10-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 47-10-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: LOCKHEED Model 49 Subject: Elevator Booster Shifter Horn Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: Make: Lockheed Aircraft Corporation Model: 49-46 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: 47-10-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: AD NUMBER: 47-10-08 SUBJECT HEADING: LOCKHEED Model 49 ACTION: SUMMARY: DATES: ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 47-10-08 LOCKHEED: (Was Mandatory Note 9 of AD-763-3.) Applies Only to Model 49 Serial Numbers 1975 to 1978, Inclusive; 1980; and 2021 to 2059, Inclusive. Compliance required prior to August 9, 1946. Rework the elevator booster shifter horn assembly by reducing the width of the teeth on 278488 gear. 0.120 inch should be removed from each end of all the teeth. (LAC Service Bulletin 049/SB-19 covers this same subject.) 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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