AD 89-23-15
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | BOEING OF CANADA, LTD., DE HAVILLAND DIVISION Model DHC-8-100 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | BOEING OF CANADA, LTD., DE HAVILLAND DIVISION Model DHC-8-100 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | BOEING OF CANADA, LTD., DE HAVILLAND DIVISION Model DHC-8-100 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | BOEING OF CANADA, LTD., DE HAVILLAND DIVISION Model DHC-8-100 Series Airplanes |
Unsafe Condition
Unwanted propeller feathering due to inadvertent activation of the alternate feather switches.
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Required Actions
Modify the alternate feather system in accordance with Service Bulletin No. 8-61-10, Revision A. An alternate means of compliance or adjustment may be used if approved by the FAA. Special flight permits may be issued under FAR 21.197 and 21.199.
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Compliance Time
within the next 400 hours time-in-service after the effective date of this AD
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Affected Aircraft
Model DHC-8-100 series airplanes, Serial Numbers 1 through 91
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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