AD 92-11-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | ATP | Airworthiness Directives; British Aerospace Model ATP Airplanes |
Unsafe Condition
Inaccurate navigation when using the standby magnetic compass due to excessive error induced by cabin roof and sidewall lighting, pitot heat, and stall warning systems.
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Required Actions
Install a temporary placard near the standby compass within 14 days. Within 8 months, modify earthing arrangements for pitot static, stall warning systems, and overhead stowage units; modify roof and sidewall light wiring; perform a compass swing; and remove the temporary placard.
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Compliance Time
Within 14 days after the effective date of this AD for the placard, and within 8 months after the effective date for the remaining modifications.
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Affected Aircraft
British Aerospace Model ATP airplanes listed in Service Bulletins ATP-24-34 and ATP-33-8, Revision 2, dated April 25, 1991, and April 11, 1991 respectively.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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