AD 2009-18-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Construcciones Aeronauticas, S.A. (CASA), Model CN-235, CN-235-100, CN-235-200, and CN-235-300 Airplanes |
Unsafe Condition
During operation in icing conditions, an asymmetric configuration of the de-icing boots was detected, occurring during the inflation and deflation check of the de-icing system. This was found to be due to an unexpected failure mode in the pneumatic and de-icing system's control electronic logic.
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Required Actions
Modify the aircraft de-icing boots control system in accordance with the Accomplishment Instructions of European Aeronautic Defense and Space Company (EADS) CASA Service Bulletin SB-235-30-16, dated January 21, 2005.
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Compliance Time
Within six months after the effective date of this AD.
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Affected Aircraft
Construcciones Aeronauticas, S.A. (CASA) Model CN-235, CN-235-100, CN-235-200, and CN-235-300 airplanes, certificated in any category, all serial numbers up to, but not including, C-139.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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