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.
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.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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