AD 94-08-10
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 structure because of corroded wing main spar lower cap angles.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Visually inspect the wing main spar and lower spar cap extensions for corrosion using a high intensity light. If corrosion exceeds specified criteria, remove surface corrosion, replace cap angles, dye penetrant inspect parts, replace damaged parts, and reprotect reworked areas. Submit rework details to the manufacturer through the New York Aircraft Certification Office and incorporate any additional instructions provided.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required initially in accordance with whichever of the following is applicable, and thereafter at intervals not to exceed 60 calendar months: (1) Upon the accumulation of 120 calendar months from the date of manufacture or within the next 3 calendar months after the effective date of this AD, whichever occurs later; (2) Upon the accumulation of 120 calendar months after incorporating Wing Box Replacement Modification No. 6/1630 or within 3 calendar months after the AD's effective date, whichever is later; or (3) Upon 120 calendar months of original wing manufacture if used wings were installed, or within 3 calendar months after the AD's effective date, whichever is later.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Viking Air Limited DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300 airplanes (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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