AD 89-26-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Viking Air Limited | DHC-7-1 | Airworthiness Directives; Boeing Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-100 | Airworthiness Directives; Boeing Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-101 | Airworthiness Directives; Boeing Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-102 | Airworthiness Directives; Boeing Model DHC-7 Series Airplanes |
| aircraft | Viking Air Limited | DHC-7-103 | Airworthiness Directives; Boeing Model DHC-7 Series Airplanes |
Unsafe Condition
Collapse of the main landing gear (MLG) due to failure of the MLG upper lock strut with part numbers 15707-3, 15707-5, 15707-7, or those that cannot be positively identified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect MLG upper lock struts for part numbers within 50 hours time-in-service after the effective date. Reprotect parts with alodine 1200 and grey epoxy paint if part numbers are 15707-5 or 15707-7. Perform one-time NDT inspection and daily visual inspections for cracks if part number is 15707-3, both 15707-3 and 15707-5, or unidentifiable. Replace struts with P/N 15709-7 or 15709-9 within 90 days after the effective date. Alternate compliance may be approved by the FAA Manager.
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Compliance Time
Within 50 hours time-in-service after the effective date of this AD, and within 90 days after the effective date for replacements. Compliance with inspections and replacements must be done prior to further flight as specified.
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Affected Aircraft
Viking Air Limited Model DHC-7-1, DHC-7-100, DHC-7-101, DHC-7-102, DHC-7-103 airplanes certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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