AD 91-24-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | ATP | Airworthiness Directives; British Aerospace Model ATP Series Airplanes |
Unsafe Condition
Failure of the landing gear hydraulic selector valves (part numbers AIR44880 and AIR44882) could result in a gear-up landing.
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Required Actions
Modify and test the landing gear hydraulic selector valves in accordance with AP Precision Hydraulics Service Bulletin AIR44880-29-01 dated April 1991. The modification and testing must be done per the service bulletin, and an alternative method of compliance may be approved by the FAA.
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Compliance Time
Within 12 months after the effective date of this AD
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Affected Aircraft
Model ATP series airplanes equipped with hydraulic selector valves part number AIR44880 and AIR44882, 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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