AD 86-04-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | 767-200 Series | BOEING Model 767 Series Airplanes |
| aircraft | The Boeing Company | 767-300 Series | BOEING Model 767 Series Airplanes |
| aircraft | The Boeing Company | 767-300F Series | BOEING Model 767 Series Airplanes |
Unsafe Condition
Failure of the counterbalance gearbox assembly could result in improper entry/service door operation during emergency evacuation.
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Required Actions
Modify the counterbalance gearbox assemblies in accordance with Boeing Service Bulletin 767-52-0029 or later FAA-approved revisions. An alternate means of compliance may be used if approved by the Manager, Seattle Aircraft Certification Office.
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Compliance Time
within nine months after the effective date of this AD
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Affected Aircraft
Boeing Model 767-200 Series, 767-300 Series, 767-300F Series airplanes as specified in Boeing Service Bulletin 767-52-0029 dated August 2, 1985.
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Federal Register Abstract
Counterbalance Gearbox Assembly
Applicability Source Text
Show captured applicability text from the source AD
AD Final Rules - DRS_86-04-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 86-04-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 767 Series Airplanes Subject: Counterbalance Gearbox Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/27/1986 Make: The Boeing Company Model: 767-200 Series | 767-300 Series | 767-300F Series Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 86-04-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5238 AD NUMBER: 86-04-08 SUBJECT HEADING: BOEING Model 767 Series Airplanes ACTION: SUMMARY: DATES: Effective March 27, 1986. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 86-04-08 BOEING: Amendment 39-5238. Applies to Model 767 series airplanes, as specified in Boeing Service Bulletin 767-52-0029 dated August 2, 1985, certificated in any category. To assure proper entry/service door operation during emergency evacuation, accomplish the following within nine months after the effective date of this AD, unless previously accomplished: A. Modify the counterbalance gearbox assemblies in accordance with Boeing Service Bulletin 767-52-0029 dated August 2, 1985, or later FAA-approved revisions. B. An alternate means of compliance which provides an acceptable level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD. All persons affected by this proposal who have not already received copies of the manufacturer's service bulletin may obtain copies upon request from the Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. This document may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington. This amendment becomes effective March 27, 1986. FOOTER:
Document Text
Show stored source text (verify against official source)
AD Final Rules - DRS_86-04-08.html Copy URL Print/Save as PDF Document Versions Feedback Details AD Number: 86-04-08 Document Type: AD Final Rules Docket Number: Unknown Subject Heading: BOEING Model 767 Series Airplanes Subject: Counterbalance Gearbox Assembly Status: Current Citation: This information is not available. Citation Publish Date: Effective Date: 03/27/1986 Make: The Boeing Company Model: 767-200 Series | 767-300 Series | 767-300F 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: 86-04-08 CITATION: This information is not available. PAGE NUMBER: DOCKET NUMBER: Unknown AMENDMENT: 39-5238 AD NUMBER: 86-04-08 SUBJECT HEADING: BOEING Model 767 Series Airplanes ACTION: SUMMARY: DATES: Effective March 27, 1986. ADDRESSES: FOR FURTHER INFORMATION CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 86-04-08 BOEING: Amendment 39-5238. Applies to Model 767 series airplanes, as specified in Boeing Service Bulletin 767-52-0029 dated August 2, 1985, certificated in any category. To assure proper entry/service door operation during emergency evacuation, accomplish the following within nine months after the effective date of this AD, unless previously accomplished: A. Modify the counterbalance gearbox assemblies in accordance with Boeing Service Bulletin 767-52-0029 dated August 2, 1985, or later FAA-approved revisions. B. An alternate means of compliance which provides an acceptable level of safety may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. C. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections and/or modifications required by this AD. All persons affected by this proposal who have not already received copies of the manufacturer's service bulletin may obtain copies upon request from the Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. This document may be examined at the FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington. This amendment becomes effective March 27, 1986. FOOTER:
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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