AD 87-03-12
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-1 | Airworthiness Directives; DeHavilland Models DHC-6 1, 100, 200, and 300 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives; DeHavilland Models DHC-6 1, 100, 200, and 300 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives; DeHavilland Models DHC-6 1, 100, 200, and 300 Series Airplanes |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives; DeHavilland Models DHC-6 1, 100, 200, and 300 Series Airplanes |
Unsafe Condition
Disengagement of the utility seat forward legs from the floor mounting rail.
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Required Actions
Within 50 hours time-in-service after the effective date, inspect the lower end of each forward leg by attempting to move it sideways into the keyhole slot using hand force. If removable, remove the seat from service until Modification No. 6/1828 is incorporated per Service Bulletin 6/447, Rev C. Repeat checks each time seats are moved from stowed to deployed position, which can be done by a flightcrew member briefed on the procedure. Equivalent compliance may be approved by the FAA.
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Compliance Time
Within 50 hours time-in-service after the effective date, unless already accomplished within the last 25 hours time-in-service, and at subsequent intervals not to exceed 50 hours time-in-service thereafter.
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Affected Aircraft
DeHavilland Models DHC-6 1, 100, 200, and 300 Series airplanes certificated in any category, when fitted with side folding cabin utility seats.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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