AD 86-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; DeHavilland Model DHC-8-101 and -102 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; DeHavilland Model DHC-8-101 and -102 Series Airplanes |
Unsafe Condition
Failure of the fore rudder upper and lower mounting brackets and fin rear spar web.
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Required Actions
Within 100 hours time-in-service after the effective date, and every 200 hours thereafter, conduct visual inspections of the mounting brackets per SB 8-55-7. If cracks are found, inspect the spar web and reinforce brackets with Modification 8/0647. Replace cracked spar web with new web or approved repair. Install Modification 8/0647 within 500 hours time-in-service. Special flight permits may be issued under FAR 21.197/199.
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Compliance Time
Within the next 100 hours time-in-service after the effective date of this AD, and thereafter at intervals not to exceed 200 hours time-in-service. Within 500 hours time-in-service after the effective date for Modification 8/0647 installation.
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Affected Aircraft
DeHavilland Model DHC-8-101 and -102 series airplanes equipped with upper and lower fore rudder mounting brackets P/N 85530097-105 and -107.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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