AD 67-33-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-1 | Airworthiness Directives; de Havilland Aircraft Type DHC-6 Series Aircraft |
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives; de Havilland Aircraft Type DHC-6 Series Aircraft |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives; de Havilland Aircraft Type DHC-6 Series Aircraft |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives; de Havilland Aircraft Type DHC-6 Series Aircraft |
Unsafe Condition
Flutter of the left elevator trim tab
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install a placard stating 'SPEED SHALL NOT EXCEED 125 KNOTS IAS (144 M.P.H. IAS)' before next flight. Conduct one-time inspections on the left elevator-trim tab assembly including bolt removal, trim tab operation, and vertical free play measurement. Visually inspect the trim tab for diagonal buckling or concavity before each flight. Replace non-compliant trim tabs with approved parts. Discontinue inspections after approved modification.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Prior to the next flight, before each flight
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Viking Air Limited DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300 aircraft
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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