AD 73-20-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-6-1 | Airworthiness Directives; de Havilland Model DHC-6 Twin Otter Floatplanes all Series |
| aircraft | Viking Air Limited | DHC-6-100 | Airworthiness Directives; de Havilland Model DHC-6 Twin Otter Floatplanes all Series |
| aircraft | Viking Air Limited | DHC-6-200 | Airworthiness Directives; de Havilland Model DHC-6 Twin Otter Floatplanes all Series |
| aircraft | Viking Air Limited | DHC-6-300 | Airworthiness Directives; de Havilland Model DHC-6 Twin Otter Floatplanes all Series |
Unsafe Condition
Loosening and subsequent pullout failure of certain float to fuselage bolts.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Comply with accomplishment instructions of de Havilland Service Bulletin 6/296, Revision A, dated May 11, 1973, or an equivalent alteration approved by the Chief, Engineering and Manufacturing Branch, FAA, Eastern Region.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next ten hours in service from the effective date of this Airworthiness Directive, unless already accomplished
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Affected Aircraft
de Havilland Model DHC-6 Twin Otter Floatplanes all Series, equipped with Canadian Aircraft Products Model 12000A or 12000B Floats installed prior to Float Serial No. 71.
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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