Hydraulics 747-400

Question 1

What could be the reason for a hydraulic quantity decrease during flight?

Answer 1

1) Large actuators operating like Landing gear retraction

2) Cold soak condition.

Question 2

Engine 3 is shut down due to fire warning and the fire switch is pulled. What happens to the hydraulic system.

Answer 2

EDP 3 depressurized and SOV 3 closed, demand pump 3 commanded to run.

Question 3

On approach, selecting flaps 5, and the HYD PRESS DEM 1 message appears. What can fix the situation?

Answer 3

Selecting demand pump selector 1 to ON may solve the problem.

Question 4

Which abnormal condition does not trigger the SYS FAULT light?

Answer 4

System reservoir pressure low.

Question 5

What EICAS message triggers the beeper when it comes to hydraulics?

Answer 5

HYD PRESS SYS