AD 85-07-08
Unsafe Condition
Failure of the audio communication system
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Required Actions
Modify the power supply system in accordance with British Aerospace HS 125 Service Bulletin 23-21-8765. Alternate means of compliance may be used if approved by the FAA. Special flight permits may be issued under FAR 21.197 and 21.199.
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Compliance Time
within 180 days after the effective date of this AD, unless previously accomplished
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Affected Aircraft
BRITISH AEROSPACE Model HS/BH/DH 125 series airplanes with serial numbers listed in Service Bulletin 23-21-8765
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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