Hydraulic Systems

Question 1

There are how many independent hydraulic systems?

Answer 1

3

Question 2

What systems does the hydraulic system power?

Answer 2

flight controls
spoilers
Landing gear
Nose wheel steering
Wheel Breaks
Thrust Reversers

Question 3

Which hydraulic system is more critical?

Answer 3

2, landing gear, thrust reservers, nose wheel steering.

Question 4

When does the AC motor Pump for system one turned on?

Answer 4

according to the logic:
Takeoff 50 Knots GS or thrust levers at TOGA
or
Landing with flaps greater than 0
or
EDP fails

Question 5

When does the AC motor Pump for system two turned on?

Answer 5

If only engine 1 is running and parking break is released or set within the last 6 min 
or
T/O toga or 50 Knots GS
or 
Landing flaps greater than 0
or 
EDP fails

Question 6

When does the PTU turn o

Answer 6

EDP 2 fails
or
Engine 2 fails
AND
EDP 1 must be operative and system 2 reservoir quantity to be at least 12℅

Question 7

What are the temperature limits on the hydraulic systems?

Answer 7

100c you get an EICAS message. 125 the pumps turn off and the systems are isolated

Question 8

Why do we usually taxi with engine 1?

Answer 8

it will allow (according to logic) to turn on pump 2 which will power inboard breaks on system 2. you can taxi with engine 2, but your QRH will call for hydraulic pump 1 which will power the outboard breaks

Question 9

When does ACMP 3B turned on when in auto mode?

Answer 9

In flight if the 3A fails in flight