AD 91-04-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | ATP | Airworthiness Directives; British Aerospace Model ATP Series Airplanes |
Unsafe Condition
Loss of all DC electrical power due to stall warning contoured airframe heaters being connected to the essential 28V DC busbars.
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Required Actions
Disconnect stall warning contoured airframe heaters from essential 28V DC busbars and reconnect them to nonessential busbars within 60 days after the effective date. Use British Aerospace Service Bulletin ATP-27-18, Revision 1, dated January 31, 1990. Alternate compliance may be approved by the FAA Manager, Standardization Branch.
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Compliance Time
within 60 days after the effective date of this AD
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Affected Aircraft
British Aerospace Model ATP series airplanes, Serial Numbers 2002 through 2018, inclusive, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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