AD 75-26-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Airbus SAS | BAC 1-11 200 Series | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models BAC 1- 11 200 and 400 Series Airplanes |
| aircraft | Airbus SAS | BAC 1-11 400 Series | Airworthiness Directives; BRITISH AIRCRAFT CORPORATION Models BAC 1- 11 200 and 400 Series Airplanes |
Unsafe Condition
Hazardous arcing at the H.F. antenna tuning unit connector post in the vicinity of the oxygen system.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect H.F. antenna lead-in cable, A.T.U. connectors, tuning unit, adjacent wiring, and oxygen piping for overheating damage or arcing, replace damaged parts; remove and discard rubber overshoe at A.T.U. connector post; attach placard on instrument panel instructing pilot to keep passenger oxygen system control valve in OFF position and follow applicable FARs. Repeat inspections every 50 hours until compliance with paragraph (c), then every 200 hours. Complete BAC Alert Service Bulletin 23-A-PM 4346 and Modification PM 4412 parts (a) and (b) or FAA-approved equivalents to remove placard and extend inspection interval.
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Compliance Time
Within the next 25 hours' time in service after the effective date of this AD
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Affected Aircraft
BRITISH AIRCRAFT CORPORATION Models BAC 1-11 200 and 400 Series airplanes equipped with H.F. radio systems without BAC Modifications PM 4412 Part (a) or (b) and PM 4424.
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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