Hydraulic System Flashcards
How many separate hydraulic systems are there on the CRJ-900?
3
Hydraulic systems 1, 2, and 3 normal pressure is?
3000 psi
Low pressure “caution” occurs at what pressure?
Less than 1800 psi
High pressure occurs at what pressure?
3200 psi
What is the normal system quantity?
45% to 85%
High temperature condition occurs at what temperature?
Greater than or equal to 96° C
The HYD HI TEMP caution indicates that hydraulic fluid is hot in what part of system?
The reservoir
How many hydraulics pumps are there?
6; 3 full-time (“A” pumps), 3 part-time (“B” pumps)
When will the “B” pumps operate?
Switch On or with switches in AUTO at least one generator online, with the respective bus powered, and flaps extended beyond 0
What type of hydraulic fluid is used?
Skydrol
What color is the hydraulic fluid?
Purple
When will pressure relief occur?
3750 psi or greater
When will hydraulic pump 3B operate?
Switch On or with switch in AUTO at least one generator online, with the respected bus is powered, and flaps extended beyond 0 or ADG deployed
Pump 3B is automatically running when the ADG is deployed. T/F
True
With the switch in the AUTO position, Pump 3B will be operating during normal takeoff and landings. T/F
True
What ACMP is directly powered by the ADG?
3B
AC motor pumps 1B and 2B will automatically turn on during an engine failure. T/F
False
Where would you normally be able to read hydraulic brake pressure?
On the Hydraulic Synoptic Page
Where can the Hydraulic systems be viewed on EICAS under normal operating conditions?
EICAS Hydraulic Synoptic Page
What activates the Hydraulic SOV at the Engine Firewall?
ENG FIRE PUSH switch light and HYD SOV switch lights on the overhead panel
When the hydraulic pump switch 1 and 2 are set to auto, when will the pumps automatically start?
Any main generator online, with the respective bus powered, and flaps are out of ZERO degree position
Which hydraulic pumps are engine-driven?
1A and 2A
How are hydraulic systems 1 and 2 cooled?
Ram air/oil heat exchanger
Systems 1 and 2 are each powered by an EDP and an AC motor pump. T/F
True
System 3 is powered by ___ AC motor pumps
2
With normal switch positions, which electric hydraulic pump normally operates continuously?
3A
How many hydraulic systems are normally used to power the rudder?
3
The CRJ has __ hydraulic pumps
6 (2 eng-driven, 4 electric)
At cruise, normally which hydraulic pumps are operating?
1A, 2A, and 3A
You are taxiing out single engine(right side). Which hydraulic pumps are running in normal operation(flaps up)?
2A and 3A
With the No.1 engine shut down in flight, which hydraulic pumps are not available?
1A
The A pumps are engine driven, and the B pumps are electric AC motor pumps T/F
False
