AD 86-07-08
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 external combustion of fuel from wet starts could lead to structural failure or fire hazards.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Insert AD 86-07-08 into the AFM within 25 hours time-in-service after effective date. Visually inspect wing skin behind engines and perform conductivity surveys as needed per SB 7-57-25. Report findings to DeHavilland. Install heat shields per Modification 7/2414 to terminate AD requirements.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 25 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
DeHavilland Model DHC-7 series airplanes, including DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, DHC-7-103, all serial numbers.
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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