AD 86-19-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 737-300 Series | BOEING Model 737-300 Airplanes |
Unsafe Condition
The unsafe condition is related to the potential for the elevator feel and centering unit (EFCU) to overheat, which could lead to reduced elevator control effectiveness.
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Required Actions
Conduct an inspection of the EFCU and replace it if necessary. Install a heat shield and revise the airplane flight manual (AFM) with updated operational procedures.
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Compliance Time
within 1,000 flight hours, flight cycles, or landings, whichever occurs first, after the effective date of this AD.
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Affected Aircraft
Boeing Model 737-300 airplanes, serial numbers 28115 through 28134, and those modified under Supplemental Type Certificate (STC) SA####.
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Federal Register Abstract
Air Ducts
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
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