AD 86-19-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; DeHavilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; DeHavilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; DeHavilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; DeHavilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; DeHavilland Model DHC-7 Series Airplanes |
Unsafe Condition
Heat-damaged wing upper surface structure behind the engine and wet starts of the engine resulting in external combustion of fuel.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform external and internal conductivity surveys and make repairs as necessary per Service Bulletin 7-57-25. Accomplish Modification 7/2414 with prior surveys and prior modifications 7/2377 and 7/2378 for serial numbers 1-27. Submit damage details and survey data to DeHavilland Aircraft Company.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within three months after the effective date of this AD (September 26, 1986) for surveys and repairs; within 1 year after the effective date for Modification 7/2414.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
DeHavilland Model DHC-7 series airplanes, all serial numbers, certificated in any category.
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.