AD 80-24-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-2 Mk.I | Airworthiness Directives; DeHavilland Model DHC-2 Series Airplanes |
| aircraft | Viking Air Limited | DHC-2 Mk.II | Airworthiness Directives; DeHavilland Model DHC-2 Series Airplanes |
| aircraft | Viking Air Limited | DHC-2 Mk.III | Airworthiness Directives; DeHavilland Model DHC-2 Series Airplanes |
Unsafe Condition
Wing/aileron flutter due to cracks and loose rivets in the aileron differential mount structures, combined with loose control cables or improperly balanced ailerons.
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Required Actions
Inspect channel P/N C2CF623ND and angles P/N C2CF627ND/628ND for damage, cracks, and loose rivets. Repair as necessary per DeHavilland Engineering Service Bulletin Series B No. 28 supplement dated March 22, 1963. Inspect, repair, and modify channel P/N C2CF1265ND per DeHavilland Engineering Bulletin Series B No. 28 dated March 1, 1963. Ensure aileron cable tension and balance meet requirements per Service Bulletin No. 2/27 Rev A and DHC-2 repair manual.
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Compliance Time
Within the next 100 hours in service, unless already accomplished within the last 500 hours (for part (a)), or unless already accomplished (for parts (b) and (c)), and thereafter at intervals not exceeding 600 hours in service for part (a).
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Affected Aircraft
DeHavilland Model DHC-2 Mk.I, DHC-2 Mk.II, DHC-2 Mk.III aircraft with aileron differential mount structures using channel P/N C2CF623ND, C2CF1265ND, or angles P/N C2CF627ND/628ND.
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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