AD 84-20-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-2 Mk.I | Airworthiness Directives; DeHavilland Model DHC-2 MK I, MK II Beaver, and MK III Turbo Beaver Series Airplanes |
| aircraft | Viking Air Limited | DHC-2 Mk.II | Airworthiness Directives; DeHavilland Model DHC-2 MK I, MK II Beaver, and MK III Turbo Beaver Series Airplanes |
| aircraft | Viking Air Limited | DHC-2 Mk.III | Airworthiness Directives; DeHavilland Model DHC-2 MK I, MK II Beaver, and MK III Turbo Beaver Series Airplanes |
Unsafe Condition
Failure of the wing lift strut due to cracks, marks, or nicks in the radius of the lift strut upper fitting at the 1/8-inch radius junction of the lug to the attachment flanges.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the lift strut upper fitting using dye-penetrant method or FAA approved equivalent for cracks at the specified radius junction. Replace the lift strut assembly before further flight if cracks, marks, or nicks are found, using specific replacement part numbers based on airplane model. Comply with service bulletins for retirement times and use specified bolts for new installations.
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 from the last inspection.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Viking Air Limited Models DHC-2 Mk.I (L-20A, YL-20, U-6, and U-6A), MK II (S/N 80) Beaver, and MK III Turbo Beaver series airplanes, certificated in any category.
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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