Systems - Hydraulics

Question 1

What type of hydraulic pumps are in system 2?

Answer 1

EDP 2 (Engine Driven Pump 2)

ACMP 2 (AC Motor Pump 2)

PTU (from System 1)

Question 2

When will EDP 2 begin pumping hydraulic fluid? Is this automatic?

Answer 2

When the engine is running. Yes.

Question 3

When will ACMP 2 turn on automatically?

Answer 3

Engine 1 running and parking brake released

During Engine 1 start (once N2 reaches 40%) if parking brake has been applied within last 6 minutes.

Question 4

When will ACMP 2 turn off automatically?

Answer 4

After parking brake has been set for 6 minutes.

Question 5

Which hydraulic system controls nosewheel steering? Landing gear?

Answer 5

Number 2 (both systems)

Question 6

What type of hydraulic pumps are in system 3?

Answer 6

ACMP (AC Motor Pumps)

Question 7

When will ACMP 3A begin pumping hydraulic fluid? Is this automatic?

Answer 7

When turned on. Activated prior to engine start (deactivated after shutdown)

Question 8

When will ACMP 3B turn on automatically?

Answer 8

Upon ACMP 3A failure.

Question 9

What is the primary purpose of the PTU?

Answer 9

Provide hydraulic pump power to System 2 from System 1, to assist in gear retraction should loss of Number 2 engine or EDP 2 occur.

Question 10

Will the PTU run on the ground in AUTO?

Answer 10

No

Question 11

When will the PTU run in flight (knob in AUTO)?

Answer 11

Flaps Not Zero or Landing Gear not up and locked. AND

EDP 1 not fail. AND

Hydraulic reservoir 2 quantity above 12%.