AD 84-07-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-2 Mk.I | Airworthiness Directives; DeHavilland Model DHC-2 MK. I , MK. II, and MK. III Series Airplanes |
| aircraft | Viking Air Limited | DHC-2 Mk.II | Airworthiness Directives; DeHavilland Model DHC-2 MK. I , MK. II, and MK. III Series Airplanes |
| aircraft | Viking Air Limited | DHC-2 Mk.III | Airworthiness Directives; DeHavilland Model DHC-2 MK. I , MK. II, and MK. III Series Airplanes |
Unsafe Condition
Failure of center hinge/balance arm brackets (aluminum castings) P/N C2-WA-126A (RH) and P/N C2-WA-125A (LH) due to six attachment rivet holes in the spigot or cracks.
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Required Actions
Visually inspect left and right aileron center hinge/balance arm brackets per DeHavilland SB No. 2/37 Rev A. Replace brackets with new balance arm assemblies in a 2-rivet configuration using specified part numbers if six rivet holes are found. Replace cracked parts before further flight with new parts or machined brackets per SB No. 2/37. Reinspections required for cast replacements. Modification Kit 2/1536 eliminates repetitive inspections.
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Compliance Time
Within the next 100 hours time-in-service or two months, whichever occurs first after the effective date, and at each 500 hours time-in-service or twelve months thereafter, whichever occurs first.
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Affected Aircraft
DeHavilland Model DHC-2 MK. I (including L-20A, YL-20, U-6 and U-6A), MK. II, and MK. III airplanes certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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