AD 71-21-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-1 | Airworthiness Directives; de Havilland Model DHC- 6 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives; de Havilland Model DHC- 6 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives; de Havilland Model DHC- 6 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives; de Havilland Model DHC- 6 Series Airplanes |
Unsafe Condition
Loss of AC power system due to a fault in an AC circuit causing total power loss.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Comply with Service Bulletin 6/263 (Rev B) instructions 1 and 2(a) through 2(e), replace slow-blow fuses with Littlefuse or Bussman types as specified, and replace non-compliant inverters prior to further flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 250 hours' time in service after the effective date of this AD unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
de Havilland Model DHC-6 Series Airplanes, Serial Numbers 6 through 289 with Flitetronic Type PC 15 or PC 15A Inverters.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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