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Mon, Aug 18, 2014

AD: Bombardier, Inc. Airplanes

AD NUMBER: 2014-15-20

PRODUCT: Certain Bombardier, Inc. Model DHC-8-400 series airplanes.
ACTION: Final Rule

SUMMARY:  This AD was prompted by reports of failure of the high pressure shutoff valves (HPSOVs) causing the timer and monitor unit (TMU) to become inoperative since the HPSOV and the TMU are on the same circuit breaker.

This AD requires a wiring modification to segregate the HPSOV power supply from the TMU.

The FAA is issuing this AD to prevent an inoperative TMU, which could result in the loss of the automatic de-icing mode, and lead to an increased workload for the flight crew and loss of control of the airplane.

DATES: This AD becomes effective September 19, 2014.

FMI: AD

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