AD 2009-18-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | DHC-8-400 | Airworthiness Directives; Bombardier Model DHC-8-400 Series Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier Model DHC-8-400 Series Airplanes |
Unsafe Condition
Four aircraft have experienced a dual AC generator shutdown, caused by a broken propeller de-ice bus bar which short-circuited with the backplate assembly. Any friction or contact between a propeller de-ice bus bar and the backplate assembly can cause an intermittent short circuit, leading to a dual AC generator shutdown that could result in reduced controllability of the aircraft, particularly in icing conditions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the Limitations Section of the AFM by inserting Bombardier Dash 8 Q400 Temporary Amendment (TA) 14, Issue 1, dated May 10, 2006. Within 5,000 flight hours after the effective date, apply sealant between the bus bar assemblies and the backplate assembly by incorporating Bombardier DHC-8-400 Modification Summary 4-163047, Revision B, dated August 22, 2008, in accordance with Bombardier Service Bulletin 84-61-03, Revision A, dated September 18, 2008.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days for AFM revision; within 5,000 flight hours for sealant application.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bombardier Model DHC-8-400, DHC-8-401, and DHC-8-402 series airplanes, certificated in any category, serial numbers 4001, 4003, 4004, 4006, and 4008 through 4154 inclusive.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.