AD 77-13-18

final rule

Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model BAC 1- 11, 401AK Series Airplanes

AD Number
77-13-18
Status
final_rule
Effective Date
Product Category
aircraft
Docket
Unknown
FR Citation
This information is not available.
Technical illustration of an aircraft landing gear and wheel assembly
Problem area Landing gear

Applicability

TypeManufacturerModelDetails
aircraft Airbus SAS BAC 1-11 400 Series Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model BAC 1- 11, 401AK Series Airplanes

Unsafe Condition

Failure of free fall capability of the nose landing gear system due to Dupont Vespel bushings in the nose gear fall cam mechanism.

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

Required Actions

Inspect the nose landing gear free fall mechanism within 160 hours time in service after the effective date, and at intervals not exceeding 160 hours. Replace Dupont Vespel bushings with British Aircraft Corporation bushings P/N AB44-1875/1943 (2 per airplane) and AB44-1879/1945 (1 per airplane) to terminate inspections.

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

Compliance Time

Within the next 160 hours time in service after the effective date of this AD, unless already accomplished within the previous 160 hours time in service, and thereafter at intervals not to exceed 160 hours time in service from the last inspection.

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

Affected Aircraft

BRITISH AIRCRAFT CORPORATION Model BAC 1-11, 401AK series airplanes with Dupont Vespel bushings in the nose gear fall cam mechanism.

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

Federal Register Abstract

Nose Landing Gear System

Applicability Source Text

Show captured applicability text from the source AD
AD Final Rules - DRS_77-13-18.html
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AD Number:
77-13-18
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model BAC 1- 11, 401AK Series Airplanes
Subject:
Nose Landing Gear System
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
07/27/1977
Make:
Airbus SAS
Model:
BAC 1-11 400 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Superseded AD: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: 77-13-18
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-2940

AD NUMBER:   77-13-18

SUBJECT HEADING:   Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model BAC 1- 11, 401AK Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective July 27, 1977.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
77-13-18 BRITISH AIRCRAFT CORPORATION: Amendment 39-2940. Applies to BAC 1- 11, Model 401AK series airplanes, certificated in all categories, which have Dupont Vespel bushings installed in the nose gear fall cam mechanism.

Compliance is required as indicated.

To prevent failure of free fall capability of the nose landing gear system, accomplish the following:

(a) Within the next 160 hours time in service after the effective date of this AD, unless already accomplished within the previous 160 hours time in service, and thereafter at intervals not to exceed 160 hours time in service from the last inspection, inspect the nose landing gear free fall mechanism in accordance with the procedures described in item BB of the "Accomplishment Instructions," paragraph 2, steps 1 through 8, of British Aircraft Corporation Alert Service Bulletin 32-A-PM5335, dated May 31, 1975, or an FAA-approved equivalent.

(b) The inspections of the nose landing gear free fall mechanism required by paragraph (a) of this AD may be terminated upon the replacement of the Dupont Vespel bushings in the free fall cam mechanism with British Aircraft Corporation bushing P/N AB44-1875 or AB44- 1943 (2 per airplane) and bushing P/N AB44- 1879 or AB44-1945 (1 per airplane).

This amendment becomes effective July 27, 1977.

FOOTER:

Document Text

Show stored source text (verify against official source)
AD Final Rules - DRS_77-13-18.html
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Print/Save as PDF
Document Versions
 Feedback
Details
AD Number:
77-13-18
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model BAC 1- 11, 401AK Series Airplanes
Subject:
Nose Landing Gear System
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
07/27/1977
Make:
Airbus SAS
Model:
BAC 1-11 400 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: 77-13-18
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-2940

AD NUMBER:   77-13-18

SUBJECT HEADING:   Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model BAC 1- 11, 401AK Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective July 27, 1977.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
77-13-18 BRITISH AIRCRAFT CORPORATION: Amendment 39-2940. Applies to BAC 1- 11, Model 401AK series airplanes, certificated in all categories, which have Dupont Vespel bushings installed in the nose gear fall cam mechanism.

Compliance is required as indicated.

To prevent failure of free fall capability of the nose landing gear system, accomplish the following:

(a) Within the next 160 hours time in service after the effective date of this AD, unless already accomplished within the previous 160 hours time in service, and thereafter at intervals not to exceed 160 hours time in service from the last inspection, inspect the nose landing gear free fall mechanism in accordance with the procedures described in item BB of the "Accomplishment Instructions," paragraph 2, steps 1 through 8, of British Aircraft Corporation Alert Service Bulletin 32-A-PM5335, dated May 31, 1975, or an FAA-approved equivalent.

(b) The inspections of the nose landing gear free fall mechanism required by paragraph (a) of this AD may be terminated upon the replacement of the Dupont Vespel bushings in the free fall cam mechanism with British Aircraft Corporation bushing P/N AB44-1875 or AB44- 1943 (2 per airplane) and bushing P/N AB44- 1879 or AB44-1945 (1 per airplane).

This amendment becomes effective July 27, 1977.

FOOTER:

Source: Official FAA Source ↗

Retrieved: Apr 8, 2026

Rights: U.S. Government Public Domain

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