AD 97-07-10 R1
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
Failure of the wing struts due to cracks or damage (chafing, etc.) caused by the upper fairing rubbing against the wing strut, which could result in loss of control of the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect wing struts part number C6W1005 for cracks or damage in accordance with de Havilland SB 6/342. Replace wing struts with FAA-approved parts if damage exceeds specified limits (0.025-inch depth, 5-inch total length, or two damage points within 10 inches) or if cracks are found, prior to further flight. Incorporate Modification 6/1581 within 600 hours time-in-service by installing a preformed nylon shield as per SB 6/342.
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 for inspections; within 600 hours time-in-service after the effective date for incorporating Modification 6/1581.
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Affected Aircraft
Viking Air Limited models DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300 (all serial numbers) without Modification No. 6/1581.
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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