A220- Hydraulics

Question 1

Which hydraulic system does the RAT provide hydraulic pressure in the event of a complete AC electrical failure?

Answer 1

The Ram Air Turbine (RAT) will provide pressure to hydraulic system 3.

Question 2

In System 1 what acts a backup for Engine Driven Pump (EDP) 1A

Answer 2

A Power Transfer Unit (PTU)

Question 3

In System 2 what acts a backup for Engine Driven Pump (EDP) 2A?

Answer 3

AC Motor Pump (ACMP) 2B

Question 4

What occurs when the HYD SOV guarded switchlight is pressed?

Answer 4

Pressing the HYD SOV guarded switchlight shuts off the hydraulic fluid supply to respective engine driven pump. The switchlight CLSD message will illuminate.

Question 5

On the ground ACMP 2B automatically starts when?

Answer 5

o EDP 1A or EDP 2A fails.
o Left or Right engine fails.
o Takeoff thrust is applied.
o Single engine taxi (left engine only), when parking brake is set to OFF.

Question 6

In fight ACMP 2B automatically starts when?

Answer 6

o EDP 1A or EDP 2A fails.
o Left or Right engine fails.
o Slats/flaps reach position 4 or 5.
o ALT FLAP switch is selected.

Question 7

In AUTO, HYD pump 3B automatically starts when:

Answer 7

o ACMP 3A fails.
o Takeoff thrust is applied.
o In flight, when SLAT/FLAP lever is out of zero.
o On‐ground, during SLAT/FLAP deployment

Question 8

On the ground the PTU automatically starts when?

Answer 8

o Takeoff thrust is applied.
o Single engine taxi (right engine only), when parking brake is set to
OFF.

Question 9

In flight the PTU automatically starts when?

Answer 9

o EDP 1A fails.
o Slats/flaps reach position 4 or 5.
o ALT FLAP switch is selected.
o Left engine fails.