AD 90-20-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 747-100 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-100B SUD Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200B Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200C Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-200F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-300 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400 Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400D Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747-400F Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747SP Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
| aircraft | The Boeing Company | 747SR Series | Airworthiness Directives; BOEING Model 747 Series Airplanes |
Unsafe Condition
The unsafe condition could occur if the horizontal stabilizer trim actuator, position sensor, or control system components fail, leading to potential uncommanded movement of the horizontal stabilizer trim, which could result in reduced control effectiveness and subsequent loss of aircraft controllability.
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Required Actions
Conduct an inspection of the horizontal stabilizer trim actuator, position sensor, and control system components. Perform necessary repairs or replacements based on inspection findings. Implement a repetitive inspection program with specific intervals to ensure ongoing compliance.
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Compliance Time
Prior to the accumulation of 500 flight hours, or as soon as practicable thereafter, but in no case later than 180 days after the effective date of this AD.
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Affected Aircraft
Boeing Model 747 series airplanes, excluding specific models modified under STC SA####-##, as listed in the AD's applicability section.
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Federal Register Abstract
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Applicability Source Text
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Skip to main content (Press Enter). United States Department of Transportation About DOTOur ActivitiesAreas of Focus FAA Dynamic Regulatory System A Comprehensive Knowledge Center of Regulatory and Guidance Material from the Office of Aviation Safety and other Services and Offices Welcome, Guest Sign In Search What's New DRS Feedback Help & Training Home Browse Expand AllCollapse All Airworthiness Directives (ADs) Regulations Regulation Related Documents and Reports Civil Aeronautics Manuals Advisory Circulars Order 8900.1, Flight Standards Information Management System Other Orders, Notices, Handbooks, Bulletins and Manuals Technical Standard Orders (TSO), Consensus Standards Policy Statements, Memos and Deviations Safety Assurance System (SAS) Design and Production Approvals Aircraft Safety Alerts Aircraft Evaluation Division (AED) Guidance Documents including MMELs Office of the Chief Counsel (AGC) Commercial Space (AST) Air Traffic Organization (ATO) Flight Standards (FS) Administrative Information Aviation Safety Draft Documents Open for Comments Advisory and Rulemaking Committees Other Documents DRS consolidates information provided by various Services and Offices and does not own any of the content within the system. For technical questions or comments about any document in DRS or to request reconsideration, modification, or rescission of guidance documents, please contact the Office of Primary Responsibility (OPR) using the feedback feature while viewing the document. For comments that FAA is not following the requirements of OMB's Good Guidance Bulletin or is improperly treating a guidance document as a binding requirement please contact AGC-200 using the feedback feature while viewing the document. Basic Search of Current Documents Basic Search Tips Enter one or more words separated by spaces. Put a word or phrase inside double quotes to search for an exact match. SearchReset Advanced Search Limit results to All U.S. Department of Transportation Federal Aviation Administration 800 Independence Avenue, SW Washington, DC 20591 (866) TELL-FAA | (866) 835-5322 Privacy Policy Accessibility
Document Text
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Skip to main content (Press Enter). United States Department of Transportation About DOTOur ActivitiesAreas of Focus FAA Dynamic Regulatory System A Comprehensive Knowledge Center of Regulatory and Guidance Material from the Office of Aviation Safety and other Services and Offices Welcome, Guest Sign In Search What's New DRS Feedback Help & Training Home Browse Expand AllCollapse All Airworthiness Directives (ADs) Regulations Regulation Related Documents and Reports Civil Aeronautics Manuals Advisory Circulars Order 8900.1, Flight Standards Information Management System Other Orders, Notices, Handbooks, Bulletins and Manuals Technical Standard Orders (TSO), Consensus Standards Policy Statements, Memos and Deviations Safety Assurance System (SAS) Design and Production Approvals Aircraft Safety Alerts Aircraft Evaluation Division (AED) Guidance Documents including MMELs Office of the Chief Counsel (AGC) Commercial Space (AST) Air Traffic Organization (ATO) Flight Standards (FS) Administrative Information Aviation Safety Draft Documents Open for Comments Advisory and Rulemaking Committees Other Documents DRS consolidates information provided by various Services and Offices and does not own any of the content within the system. For technical questions or comments about any document in DRS or to request reconsideration, modification, or rescission of guidance documents, please contact the Office of Primary Responsibility (OPR) using the feedback feature while viewing the document. For comments that FAA is not following the requirements of OMB's Good Guidance Bulletin or is improperly treating a guidance document as a binding requirement please contact AGC-200 using the feedback feature while viewing the document. Basic Search of Current Documents Basic Search Tips Enter one or more words separated by spaces. Put a word or phrase inside double quotes to search for an exact match. SearchReset Advanced Search Limit results to All U.S. Department of Transportation Federal Aviation Administration 800 Independence Avenue, SW Washington, DC 20591 (866) TELL-FAA | (866) 835-5322 Privacy Policy Accessibility
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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