AD 2010-14-16
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier | Various | Airworthiness Directives; Bombardier, Inc. Model DHC-8-400, -401, and -402 Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Bombardier, Inc. Model DHC-8-400, -401, and -402 Airplanes |
Unsafe Condition
Loss of fluid in the No.2 hydraulic system causes the power transfer unit (PTU) to overspeed, resulting in pressure fluctuations and increased fluid flow within the No. 1 hydraulic system. If the hydraulic system control logic fails to shut down the PTU, the overspeed condition can persist, potentially leading to the illumination of the No.1 HYD FLUID HOT caution light and the possible loss of both the No. 1 and No. 2 hydraulic systems.
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Required Actions
Revise the Airplane Flight Manual (AFM) to include pulling the HYD PWR XFER circuit breaker in the event of loss of all hydraulic fluid in the No. 2 hydraulic system. Modify the PTU control logic to include automatic PTU shutdown in the event of loss of fluid in the No. 2 hydraulic system.
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Compliance Time
Within 12 months of the effective date (August 17, 2010)
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Affected Aircraft
Bombardier, Inc. Model DHC-8-400, -401, and -402 airplanes, certificated in any category; serial numbers 4001, 4003, 4004, 4006, and 4008 through 4184 inclusive.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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