AD 79-14-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-1 | Airworthiness Directives; de Havilland Aircraft of Canada, Limited, Model DHC-6 Series Twin Otter Aircraft |
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives; de Havilland Aircraft of Canada, Limited, Model DHC-6 Series Twin Otter Aircraft |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives; de Havilland Aircraft of Canada, Limited, Model DHC-6 Series Twin Otter Aircraft |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives; de Havilland Aircraft of Canada, Limited, Model DHC-6 Series Twin Otter Aircraft |
Unsafe Condition
Loss of elevator control and improper operation of the elevator control system due to incorrect torque on four bolts on the aft elevator cable control quadrant.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect and torque-correct four bolts on the aft elevator cable control quadrant within 100 hours in service. Perform Modification No. 6/1679 within 600 hours in service. Use approved equivalent methods if available.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 100 hours in service after the effective date of this airworthiness directive and within 600 hours in service after the effective date.
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Affected Aircraft
de Havilland Aircraft of Canada, Limited Model DHC-6 Series Twin Otter Aircraft, serial numbers 331 through 563 inclusive, 565 through 587 inclusive, 589 through 598 inclusive, 600, 601, 603, and 604.
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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