Wed, May 17, 2006
Bombardier Inc. Models DHC-8-400, DHC-8-401 and DHC-8-402
aeroplanes, Serial Numbers 4001, 4003 and subsequent.
1. Amend the Aeroplane Flight Manual (AFM), PSM 1-84-IA, by
inserting Temporary Amendment (TA) No. 13, dated 14 July 2005, or
later approved changes to this AFM temporary amendment.
2. Advise all flight crew of the changes introduced by the AFM
Note: Transport Canada AD CF-2006-08 dated 26
April 2006 refers.
Compliance: Within 14 days after the effective
date of this directive.
This Airworthiness Directive becomes effective on 31 May
Several cases have been reported where a loss of fluid in the No.2
hydraulic system has caused the power transfer unit (PTU) to over
speed, resulting in pressure fluctuations and increased fluid flow
within the No.1 hydraulic system. In one case, the hydraulic system
control logic did not shut down the PTU and the over speed
condition persisted, resulting in the illumination of the No.1 HYD
FLUID HOT caution light.
As an interim action to avoid possible loss of both the No.1 and
No.2 hydraulic systems, the AFM has been revised to include pulling
the HYD PWR XFER circuit breaker in the event of the loss of all
hydraulic fluid in the No.2 hydraulic system.
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