AD 90-02-22
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-2 Mk.I | Airworthiness Directives; DEHAVILLAND Models DHC-2 Mk. I, and DHC-2 Mk. II Airplanes |
| aircraft | Viking Air Limited | DHC-2 Mk.II | Airworthiness Directives; DEHAVILLAND Models DHC-2 Mk. I, and DHC-2 Mk. II Airplanes |
Unsafe Condition
Cracks and distorted rivets in horizontal tailplane to fuselage front attachment brackets, part numbers C2-FS-543A and C2-FS-544A, could result in loss of structural integrity.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect brackets for cracks and distorted rivets per Service Bulletin 2/42 Rev C, replace distorted rivets and cracked brackets as indicated, and replace forward attachment bolts with AN174-H12A bolts every 1000 hours time-in-service. Exemptions apply for airplanes modified per Modification No. 2/1338 or 2/984.
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Compliance Time
Within the next 200 hours time-in-service or prior to 1000 hours time-in-service after the effective date, whichever occurs later, and thereafter at intervals not exceeding 1000 hours time-in-service.
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Affected Aircraft
Viking Air Limited models DHC-2 Mk.I (including L-20A, YL-20, U-6, U-6A) and DHC-2 Mk.II (serial numbers 1 through 1056)
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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