AD 77-13-18
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| 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.
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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.
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Affected Aircraft
BRITISH AIRCRAFT CORPORATION Model BAC 1-11, 401AK series airplanes with Dupont Vespel bushings in the nose gear fall cam mechanism.
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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 Copy URL 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Make: Airbus SAS Model: BAC 1-11 400 Series Product Type: Aircraft Product Subtype: Large Airplane Affected AD: Superseded AD: Affected By: Superseded By: Service/Office: Office of Primary Responsibility: CFR Part Reference: Part 39 Comments: AIRWORTHINESS DIRECTIVES FINAL RULES: 77-13-18 CITATION: This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:
Document Text
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AD Final Rules - DRS_77-13-18.html Copy URL 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:
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Retrieved: Apr 8, 2026
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