AD 73-25-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-2 Mk.I | Airworthiness Directives; de Havilland DHC-2, MK I (L-20A (U- 6A)) Airplanes |
Unsafe Condition
Cracks in fin rear spar attachment bolts and fitting due to operating as floatplanes or amphibians with AN 7-13 bolts or NAS 147-A26 bolts, leading to potential hazards in flight.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace AN 7-13 bolts with NAS 147-A26 bolts or inspect using dye penetrant and 10-power glass; inspect fin rear spar fitting P/N C2TF13 for distortion, cracking, fretting, or loose rivets. Repetitive inspections required at intervals not exceeding 300 hours in service unless NAS 147-A26 bolts are installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 10 hours in service or prior to the next flight carrying loads (e.g., canoes, lumber, etc.) mounted on the float support structure, whichever occurs first, after receipt of this AD. For landplane/skiplane operations, within the next 100 hours in service after receipt.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
de Havilland DHC-2 Mk.I (L-20A (U-6A)) airplanes certificated in all categories, operating as floatplanes, amphibians, or skiplanes.
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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