AD 71-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus SAS | BAC 1-11 200 Series | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model BAC 1-11 200 and 400 Series Airplanes |
| aircraft | Airbus SAS | BAC 1-11 400 Series | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Model BAC 1-11 200 and 400 Series Airplanes |
Unsafe Condition
Possible failures of the flap system secondary drive shafts at the trackside support bearing assemblies.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the bearing assembly for end float within the next 1,000 landings after the effective date or before 4,000 landings, whichever is later. If end float exceeds 0.050 inches, bend over alternate locking tabs, overhaul the bearing assembly with serviceable parts, or replace with a bearing assembly having BAC Modification PM 4642. Repeat inspections at intervals not exceeding 750 landings.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 1,000 landings after the effective date of this AD, or before the accumulation of 4,000 landings, whichever occurs later
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
BRITISH AIRCRAFT CORPORATION Model BAC 1-11 200 and 400 series airplanes that have not incorporated British Aircraft Modification PM 4642.
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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