AD 2012-06-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Airplanes |
Unsafe Condition
The airstair door seal does not deflate due to a single Input/Output Module failure under certain conditions, preventing the airstair door from opening.
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Required Actions
Incorporate ModSum 4-126513, Seal System Shut Off Valve Control Logic Change, in accordance with Bombardier Service Bulletin 84-52-69, Revision C, dated June 28, 2011.
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Compliance Time
Within 6,000 flight hours after the effective date of this AD.
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Affected Aircraft
Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes, certificated in any category, serial numbers 4001 through 4361 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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