AD 2010-17-11
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Aviat | Various | Airworthiness Directives; Dowty Propellers R408/6-123-F/17 Model Propellers |
Unsafe Condition
Friction or contact between a propeller de-ice bus bar and the backplate assembly can cause failure of the bus bar and a consequent intermittent short circuit. Such a short circuit can cause a dual AC generator shutdown that, particularly in conjunction with an engine failure in icing conditions, could result in reduced controllability of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and apply sealant between the bus bar assemblies and the backplate assembly for R408/6-123-F/17 model propellers with hub, actuator, and backplate assembly line-replaceable unit serial numbers below DAP0347 within 5,000 flight hours after the effective date. Re-apply sealant as specified every additional 10,000 flight hours for all R408/6-123-F/17 model propellers. Do not install any modified propeller on an airplane unless sealant has been applied as required.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 5,000 flight hours after the effective date for initial sealant application, and every additional 10,000 flight hours thereafter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Dowty Propellers R408/6-123-F/17 model propellers installed on, but not limited to, Bombardier, Inc. (formerly de Havilland Canada) models DHC-8-400, DHC-8-401, and DHC-8-402 series airplanes.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.