AD 88-04-10
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 shield separation resulting from the failure of aluminum alloy washers.
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Required Actions
Replace aluminum alloy washers with stainless steel washers within 60 days or 500 flight hours, whichever occurs first, following de Havilland DHC-7 Service Bulletin No. 7-57-29. An alternate means of compliance or adjustment may be used with FAA concurrence.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 60 days or 500 flight hours, whichever occurs first after the effective date of this AD
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Affected Aircraft
De Havilland Model DHC-7 series airplanes equipped with Modification No. 7/2414
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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