AD 2015-20-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | DHC-7-1 and DHC-7-100 | Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes |
| aircraft | Bombardier | Various | Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes |
| aircraft | Viking | Various | Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes |
Unsafe Condition
Reports of cracks discovered in the outboard nacelles upper longeron channels and angles, which could lead to the loss of stiffness in the forward engine mount and possible catastrophic failure.
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Required Actions
Perform a one-time detailed visual inspection for cracking in the outboard nacelles upper longeron channels and angles, in accordance with Viking Air Limited Service Bulletin V7-54-02, Revision NC. Repair any cracking found before further flight using an approved method.
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Compliance Time
Within 6 months after the effective date of this AD.
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Affected Aircraft
All Viking Air Limited (Type Certificate Previously Held by Bombardier, Inc.) Model DHC-7-1 and DHC-7-100 airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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