AD 66-17-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-2 Mk.I | Airworthiness Directives; de Havilland Model DHC-2 Series (Mk 1, 2, and 3) Airplanes |
| aircraft | Viking Air Limited | DHC-2 Mk.II | Airworthiness Directives; de Havilland Model DHC-2 Series (Mk 1, 2, and 3) Airplanes |
| aircraft | Viking Air Limited | DHC-2 Mk.III | Airworthiness Directives; de Havilland Model DHC-2 Series (Mk 1, 2, and 3) Airplanes |
Unsafe Condition
Cracks in the rib web in the upper and lower rib flanges between the front and rear spars of the wing ribs at Stations 15.50, 29.00, and 42.50.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect wing ribs at specified stations using radiographic technique or a special inspection panel with visual/dye penetrant methods. Repair cracks before further flight as per Engineering Bulletins or approved equivalents.
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' time in service, and thereafter at intervals not to exceed 500 hours' time in service until Modification 2/1497 or equivalent is incorporated.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
de Havilland Model DHC-2 Series (Mk 1, 2, and 3) Airplanes.
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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