AD 2008-11-10
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking | Air Limited Models DHC-6-1 | Airworthiness Directives; Viking Air Limited Models DHC-6-1, DHC-6-100, DHC-6-200, and DHC-6-300 Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Viking Air Limited Models DHC-6-1, DHC-6-100, DHC-6-200, and DHC-6-300 Airplanes |
Unsafe Condition
Inter-rivet cracking on wing front spar adapter assemblies (P/N C6WM1027-1) on the horizontal and vertical flanges, caused by stress corrosion in the short transverse grain initiated by local riveting induced stresses.
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Required Actions
Install inspection holes in the left-hand (LH) and right-hand (RH) lower wing skins. Inspect LH and RH front spar adapter assemblies for cracks following specified service bulletins. Replace cracked front spar adapter assemblies with P/N C6WM1027-3. Terminate repetitive inspections after replacement.
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Compliance Time
Within 180 days after August 5, 2008
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Affected Aircraft
Viking Air Limited Models DHC-6-1, DHC-6-100, DHC-6-200, and DHC-6-300 airplanes, all serial numbers, equipped with wing boxes P/Ns C6W1002-1, C6W1002-3, WR6-1002-59, or WR6-1002-61, incorporating a P/N C6WM1027-1 front spar adapter assembly with 10 or more years of service, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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