AD 2011-26-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
Unsafe Condition
Several cases of aileron terminal quadrant support brackets manufactured using sheet metal have been found cracked on DHC-8 Series 300 aircraft. Investigation revealed that the failure of the support bracket was due to fatigue. Failure of the aileron terminal quadrant support bracket could result in an adverse reduction of aircraft roll control.
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Required Actions
Install a new aileron input quadrant support bracket by incorporating MODSUM 8Q101250, in accordance with the Accomplishment Instructions of Bombardier Service Bulletin 8-57-43, Revision B, dated October 7, 2009. Compliance times vary based on total flight hours as of February 1, 2011.
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Compliance Time
Within 3,000 flight hours after February 1, 2011, for airplanes that have accumulated 30,000 total flight hours or more as of that date. For airplanes with less than 30,000 total flight hours as of February 1, 2011, compliance is required before the accumulation of 33,000 total flight cycles or within 6,000 flight hours after February 1, 2011, whichever occurs first.
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Affected Aircraft
Bombardier, Inc. Model DHC-8-301, -311, and -315 airplanes, certificated in any category; having serial numbers 100 through 530 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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