AD 91-18-20
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; Boeing Of Canada, Ltd., De Havilland Division DHC-7 Series Airplanes |
Unsafe Condition
Failure of the main landing gear (MLG) due to cracking in the upper drag strut assembly.
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Required Actions
Remove each MLG upper drag strut assembly and perform a non-destructive test. Overhaul the assembly if no cracking is found before further flight. Replace the assembly if cracking is evident before further flight. Compliance must follow Menasco Canada, Ltd. Service Bulletin No. 32-18, Revision 1.
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Compliance Time
Within one year after the effective date of this AD
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Affected Aircraft
Boeing Of Canada, Ltd., De Havilland Division DHC-7 series airplanes, Serial Numbers 1 through 27
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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