AD 94-04-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-1 | Airworthiness Directives: de Havilland DHC-6 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives: de Havilland DHC-6 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives: de Havilland DHC-6 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives: de Havilland DHC-6 Series Airplanes |
Unsafe Condition
Cracked wing attachment fittings could cause loss of control of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 100 hours time-in-service after the effective date, inspect top inner faces of left and right forward wing attachment fittings using dye penetrant and 10-power magnification. If cracks found, replace fittings with new steel adapter fittings (P/N C6WM1162-3 and C6WM1162-4) before further flight. By 2,000 hours TIS, replace fittings even without cracks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 100 hours time-in-service after the effective date of this AD, unless already accomplished within the last 400 hours TIS, and thereafter at intervals not to exceed 500 hours TIS until compliance with paragraph (b) or (c).
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Viking Air Limited models DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300 (all serial numbers)
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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