AD 78-26-07

final rule

BOEING Model 727 Series Airplanes

AD Number
78-26-07
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Unknown
FR Citation
This information is not available.

Applicability

TypeManufacturerModelDetails
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.

AI-generated summary from the source AD text. Verify against the official source before acting.

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.

AI-generated summary from the source AD text. Verify against the official source before acting.

Compliance Time

Within ten (10) days from the effective date of this AD

AI-generated summary from the source AD text. Verify against the official source before acting.

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.

AI-generated summary from the source AD text. Verify against the official source before acting.

Federal Register Abstract

Thrust Reverser Assembly

Applicability Source Text

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AD Final Rules - DRS_78-26-07.html
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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

Show stored source text (verify against official source)
AD Final Rules - DRS_78-26-07.html
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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:

Source: Official FAA Source ↗

Retrieved: Apr 8, 2026

Rights: U.S. Government Public Domain

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