AD 91-25-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | BAE Systems (Operations) Limited | ATP | Airworthiness Directives; BRITISH AEROSPACE Model ATP Series Airplanes |
Unsafe Condition
Reduced directional control of the airplane due to impairment of the operation of the rudder caused by cracks or local distortion on the angle brackets, doubling plate flanges, or fasteners of the rudder spar.
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Required Actions
Perform detailed visual inspections of angle brackets and fasteners for cracks or distortion per Service Bulletin ATP 55-3, Revision 4. Replace cracked items or insecure rivets prior to further flight. Install Modification 10170A as terminating action per Service Bulletin ATP 55-5.
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Compliance Time
Prior to the accumulation of specified time-in-service hours (750, 6,250, or 500 hours depending on configuration) or within a specified period after May 28, 1991, whichever is later, and thereafter at intervals not exceeding the same time-in-service hours.
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Affected Aircraft
BAE Systems (Operations) Limited Model ATP series airplanes not having installed Modification 10170A, 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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