AD 89-26-07
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
Reduced structural capability of the fuselage and subsequent decompression of the airplane due to disbonding of fuselage skin doublers and loose/working rivets in specified areas.
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Required Actions
Perform low frequency ultrasonic inspections for disbonding of fuselage skin doublers and visual inspections for loose/working rivets in specified fuselage stations as per Service Bulletin 7-53-33. Repair loose rivets and disbonding prior to further flight. Report findings within 3 days to Transport Canada, manufacturer, and FAA. Alternate compliance may be approved by FAA Manager.
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Compliance Time
Within 60, 90, and 150 days after the effective date (January 14, 1990) for respective inspections (A, B, C). Reports due within 3 days after each inspection.
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Affected Aircraft
Boeing Model DHC-7 series 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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