AD 67-28-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-1 | Airworthiness Directives; de Havilland Type DHC-6 Aircraft |
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives; de Havilland Type DHC-6 Aircraft |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives; de Havilland Type DHC-6 Aircraft |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives; de Havilland Type DHC-6 Aircraft |
Unsafe Condition
Loss of the horizontal stabilizer due to loose 5/16 inch diameter bolts (P/N NAS 625-36 and NAS 625-53) attaching the horizontal tailplane to the aft fuselage.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Check torque of four horizontal tailplane to aft fuselage bolts (P/N NAS 625-36 and NAS 625-53) to 225-250 inch-pounds within 15 hours' time in service after AD effective date. Retorque loose bolts to specified torque and recheck every 7 hours' time in service until approved modification is installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within the next 15 hours' time in service after the effective date of this AD
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
de Havilland Type DHC-6 Aircraft (models DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300)
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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