Hydraulic System Flashcards
What is the normal green and yellow hydraulic system pressure
3000 PSI
What is the maximum hydraulic system pressure
3000 +/- 200 PSI
When is the blue hydraulic system pressurized
Automatic with the first engine start
What is the status of the yellow hydraulic system in the graphic below
(HYD system page shows green pump circle but amber “LO” icon above it.)
The ENG PUMP switch is ON and the output pressure is low
IF the ENG 2 FIRE switch is released out
The PTU pressurizes the yellow system
Which hydraulic system pumps are running after the #1 engine start
Green and Blue
When is the PTU inhibited
Nose wheel disconnect pin installed and one engine master switch on
The PTU is automatically activated when there is a _____ PSI differential between the _____ and _____ hydraulic systems
500, green, yellow
After cargo door operation, how long is the PTU inhibited
40 seconds
What does the amber PTU indication mean
The PTU is switched off
In flight a PTU FAULT light, in addition to an ENG 2 PUMP FAULT light, could indicate a
Yellow hydraulic reservoir low fluid level
In flight, in addition to the PTU FAULT light, what other FAULT light will illuminate for a green or yellow system reservoir problem
ENG 1 or 2 PUMP FAULT light
Which device shuts off hydraulic power to the heavy users if system pressure drops below a predetermined value
Priority Valves
The RAT pressurizes the blue hydraulic system to
2500 PSI
The RAT can be deployed as an emergency means of pressurizing the _____ hydraulic system
Blue
