Hydraulics Flashcards
What are the primary hydraulic pumps for systems 1 and 2
Engine Driven Pumps (EDP 1&2)
How should ACMP 1 and 2 be set for takeoff and landing?
ON and AUTO
What are the backup hydraulic pumps for hydraulic system 1 and 2
ACMPs
What should you do before pressing EDP shutoff button?
Both pilots confirm it is the correct switch.
What position should the knobs and switches be in for normal operations?
12 o’clock, auto, and dark
What is a PTU?
Power Transfer Pump
Assists the landing gear retraction or extension if EDP 2 or right engine fail.
What is the primary hydraulic pump in system 3?
3A
Where can you check the hydraulic reservoir temperature, pressure, and quantity?
Hydraulics Synoptic page on MFD
Will ACMP 1 automatically turn on during single engine taxi on engine 2?
No
If the IDG is set to AUTO when will the ACMP be turned on?
Ground
Flaps more than 0 and speed faster than 50 KTS
Flight
EDP or engine failure or flaps more than 0
If you are doing a single engine taxi with engine 1, will HYD system 2 be pressurized?
Yes, the ACP 2 turns on automatically if engine 1 is running and parking brake has been released within 6 minutes
If you are doing a single engine taxi on engine 2 how to do you pressurize HYD 1 system?
You must turn the AC pump on
What is required to make the PTU turn on?
EDP 2 Failed
EDP 1 Operational
At least 12% fluid in system 2
Flaps greater than 0 or landing gear is not up and locked
When will the PTU automatically start on the ground?
I will not automatically turn on when on the ground
If hydraulic pump 3B is in the auto position when will the pump operate in flight?
When 3A fails
What considerations should be made if you elect to taxi single engine with the right engine?
HYD 1 pump must be turned ON
Which hydraulic system powers the nose wheel steering?
HYD 2
How are the thrust reversers actuated?
Hydraulically by an electrical control
How would you stop after landing with no hydraulics 1 or 2 system?
Emergency / Parking Brake
What is primary pump for system 3?
ACMP A
What is the back up pump for system 3?
ACMP B
Will 3B take over for 3A on the ground?
No
Why is there no AUTO mode for pump 3A?
ON mode allows there to be no computer between flight
controls and us during and electrical emergency
When are the hydraulic AC pumps activated in auto mode?
Takeoff (50 kts wheel, flaps, TOGA)
Landing (flaps)
Failure of EDP
When will ACMP pump 2 turn on automatically?
EDP 1 on and parking brake is released
engine 1 start / singe engine taxi
How long will ACMP 2 stay on after the parking brake is release?
6 minutes
What do you have to consider if you are planning a single engine taxi on engine 2?
Turn on ACMP 1
When does H-PBIT run?
When all three HYD systems are pressurized
How long does the H-PBIT take?
1 minute
How can we interrupt the H-PBIT?
Move flight controls
When should a hydraulic warm up be performed?
First flight of the day when the OAT is less than -18 C
What is the purpose of the PTU?
To increase hydraulic flow rate in system 2 if the EDP fails
Does the PTU transfer fluid between system 1 and 2?
No
What is required for the PTU to work?
EDP1 operational and 12% fluid
When does the PTU turn on?
Failure of EDP2 and flaps set greater than 0 or gear not up and locked
Why is hydraulic 2 is important?
Hydraulic 2 has the landing gear, brakes, and nose wheel steering
What do the red guarded “ENG PUMP SHUTOFF” switches do on the hydraulics panel?
Close SOV and turn off pump (if it doesn’t work we have to shut down engine)
Use when directed by the QRH
What hydraulics system is the nose wheel
steering powered by?
Hydraulics system 2
How can should you disconnect the nose
wheel steering for towing?
Disconnect trigger on the back of the yoke
How should you engage nose wheel steering?
Pushing tiller down
What could happen if you shut down engine 2 during
taxi in a turn?
Nose wheel steering could be interrupted
