AD 96-11-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; de Havilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; de Havilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; de Havilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; de Havilland Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; de Havilland Model DHC-7 Series Airplanes |
Unsafe Condition
Failure of the emergency lighting system due to voltage spikes from other equipment or due to inadvertent override of the emergency lighting switches.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Modify the emergency lights circuitry by accomplishing de Havilland Modification No. 7/1697 in accordance with Service Bulletin No. 7-33-7. Do not install emergency light switches with part number MS24659-21A.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 6 months after the effective date of this AD (June 28, 1996).
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Affected Aircraft
de Havilland Model DHC-7 series airplanes, serial numbers 3 through 27 inclusive, on which Modification No. 7/1697 has not been installed.
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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