AD 89-14-52
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | DHC-8-101 | Airworthiness Directives; Boeing Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-102 | Airworthiness Directives; Boeing Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-103 | Airworthiness Directives; Boeing Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-106 | Airworthiness Directives; Boeing Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-201 | Airworthiness Directives; Boeing Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-202 | Airworthiness Directives; Boeing Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-301 | Airworthiness Directives; Boeing Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-311 | Airworthiness Directives; Boeing Model DHC-8 Series Airplanes |
| aircraft | Bombardier Inc. | DHC-8-315 | Airworthiness Directives; Boeing Model DHC-8 Series Airplanes |
Unsafe Condition
Asymmetric flap deployment due to chafing damage/wear exceeding 0.010 inch in depth or 180 degrees of the circumference on flap drive primary torque tubes, and interference between cooling ducts and torque tubes.
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Required Actions
Within 25 hours time-in-service after the effective date, visually inspect torque tubes for wear/damage and replace if exceeding limits; inspect cooling ducts for interference, reposition to provide 0.3 inch clearance, repair broken reinforcement wires and replace within 30 days; perform torque sensor operational check per Maintenance Program Task 2750/11. Submit findings report within 7 days. Alternate compliance may be approved.
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Compliance Time
Within the next 25 hours time-in-service after the effective date of this AD
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Affected Aircraft
De Havilland Model DHC-8 series airplanes, Serial Numbers 3 and subsequent
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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