AD 2011-20141
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier, Inc. Model DHC-8-400 Series Airplanes |
Unsafe Condition
One in-service incident has been reported on a DHC-8 Series 400 airplane in which the right hand main landing gear (MLG) failed to extend using the alternate gear extension system. Investigation determined that the tread on the outboard tire was catching on the bumper plate located on the outboard MLG door, preventing the MLG door from opening following an extension attempt via the alternate extension system. Failure of the MLG to extend and lock could adversely affect the safe landing of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 2,000 flight hours after the effective date of this AD, incorporate Bombardier Modsum 4-113645, including performing a detailed visual inspection for damage or cracks of the bumper plate and base fitting, and replacing any damaged or cracked part. For airplanes with a bumper plate having part number 85424082-101 or 85424082-103 that has been reworked in accordance with Bombardier Repair Drawing 8/4-54-553, reidentify the bumper plate within 1,000 flight hours after the effective date of this AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 2,000 flight hours after the effective date of this AD (September 19, 2011).
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Affected Aircraft
Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes, certificated in any category, having serial numbers 4001 through 4247 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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