AD 78-26-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 727-100 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-100C Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727-200F Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727 Series | BOEING Model 727 Series Airplanes |
| aircraft | The Boeing Company | 727C Series | BOEING Model 727 Series Airplanes |
Unsafe Condition
Thrust reverser assemblies with specific part numbers (P/N 65-27800-29 through 65-27800-59) and actuator/track assemblies (P/N 65-37920-28, -30, -32, or -34) may fail, leading to potential uncommanded reverse thrust deployment or inadequate reverse thrust capability.
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Required Actions
Install a placard stating 'Idle Reverse Only' above the EPR indicator for each engine position with the specified thrust reverser assemblies, except those inspected and reworked per Boeing SB 727-78-A86 or equivalent. Affected operators must obtain documents from Boeing or FAA Northwest Region if not already received.
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Compliance Time
Within ten (10) days from the effective date of this AD
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Affected Aircraft
Boeing Model 727 Series airplanes equipped with operative thrust reverser assemblies P/N 65-27800-29 through 65-27800-59 and actuator/track assemblies P/N 65-37920-28, -30, -32, or -34.
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Federal Register Abstract
Thrust Reverser Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_78-26-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-26-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 727 Series Airplanes Subject: Thrust Reverser Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/03/1979 Make: The Boeing Company Model: 727-100 Series | 727-100C Series | 727-200 Series | 727-200F Series | 727 Series | 727C Series Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 78-26-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3375 AD NUMBER: 78-26-07 SUBJECT HEADING: BOEING Model 727 Series Airplanes ACTION: SUMMARY: DATES: Effective January 3, 1979. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-26-07 BOEING: Amendment 39-3375. Applies to all Model 727 airplanes equipped with operative thrust reverser assemblies P/N 65-27800-29 through 65-27800-59 which have any of the following actuator and track assemblies: P/N 65-37920-28, -30, -32, or -34. A. Within ten (10) days from the effective date of this AD, install a placard stating, "Idle Reverse Only" above the EPR indicator for each engine position equipped with one of the above operative thrust reverser assemblies, except those equipped with any of the above reverser assemblies and track and actuator assemblies that have been inspected and reworked in accordance with Boeing Service Bulletin 727-78-A86, dated December 8, 1978, or later FAA approved revisions, or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. This amendment becomes effective January 3, 1979. FOOTER:
Document Text
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AD Final Rules - DRS_78-26-07.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 78-26-07 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 727 Series Airplanes Subject: Thrust Reverser Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 01/03/1979 Make: The Boeing Company Model: 727-100 Series | 727-100C Series | 727-200 Series | 727-200F Series | 727 Series | 727C Series 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: 78-26-07 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-3375 AD NUMBER: 78-26-07 SUBJECT HEADING: BOEING Model 727 Series Airplanes ACTION: SUMMARY: DATES: Effective January 3, 1979. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 78-26-07 BOEING: Amendment 39-3375. Applies to all Model 727 airplanes equipped with operative thrust reverser assemblies P/N 65-27800-29 through 65-27800-59 which have any of the following actuator and track assemblies: P/N 65-37920-28, -30, -32, or -34. A. Within ten (10) days from the effective date of this AD, install a placard stating, "Idle Reverse Only" above the EPR indicator for each engine position equipped with one of the above operative thrust reverser assemblies, except those equipped with any of the above reverser assemblies and track and actuator assemblies that have been inspected and reworked in accordance with Boeing Service Bulletin 727-78-A86, dated December 8, 1978, or later FAA approved revisions, or an equivalent procedure approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. This amendment becomes effective January 3, 1979. FOOTER:
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Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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