ATA 29 Hydraulics Flashcards
How many pumps are used in the MAX main and auxiliary hydraulic systems?
6, 2 EDP, 2 EMDP, 1 standby and 1 PTU
How is hydraulic system A and B fluid cooled? Is it pressure, return or case drain fluid?
CASE DRAIN fluid is used to cool the internal components of the pump
Where is the standby hydraulic reservoir located?
keel beam AFT
Where is the standby hydraulic pump located?
Wing to body fairing behind right hand wheel well
The standby hydraulic pump provides pressure for _______________________.
Left and Right TR, leading edge flaps and slats, and rudder.
List the conditions needed to operate the PTU.
Airplane in the air
Trailing edge flaps not up
System B EDP low pressure (1250psi for more than 0.5 sec)
The PTU provides pressure to the ______________ and _______________.
Leading edge flaps and slats
The hydraulic system A or B overheat light is on, what does this mean?
When the pump case drain hydraulic fluid temperature increases to more than 225F(107C).
List the conditions that can cause the standby pump to operate manually when in the air?
Flight control switch A and B
ALT Flap Switch to arm
List the conditions that can cause the standby pump to operate automatically when in the air.
-Either FLT CNTRL A or B switch to ON
-ALT FLAPS arm switch to OFF
-Trailing edge flaps not up
-Airplane in the or wheel speed more than 60kts
-Low flight control pressure
What conditions are required for the hydraulic system RF message to show on the MDS systems page?
Landing gear down, airplane on the ground, and trailing edge flaps are up or both engines aren’t running.
What does the PTU drive?
Flaps and slats
When do you service the main hydraulics reservoir?
76%.
There’s always pressure in the hydraulic system, what’s the reason for this?
Positive pressure to the pumps and prevents foaming
When does the relief light come on?
3500PSI
What happens when you operate the engine fire switch’s?
The pump low pressure amber light is disarmed and the hydraulic fluid supply to the related EDP stops.
A and B Hydraulic volumes?
A = 6.8gal
B = 10.7gal
Where is the EDP located?
Front face of the engine AGB(Accessory gear box) on the left side of the engine
What is the EDP rated at?
36gpm(gallons per minute) at 3000PSI
How many pistons does the EDP have?
Rotating cylinder that has nine pistons
What is the rate of the EMDP?
5.7GPM
What kind of motor does the EMDP have?
Oil cooled, three phase 115V AC motor
Do no operate the EDP or EMDP with the _______ ________ _________ return and pressure lines connected. This may prevent the pumps from receiving enough hydraulic fluid from their respective reservoirs and cavitate the pump.
portable hydraulic cart
How many pounds of fuel is needed if you want to run the hydraulic system?
1675 lbs of fuel
