Subtask 10.1.7 Operate Hydraulic Systems

Question 1

What type of hydraulic pumps are in system 1?

Answer 1

One engine-driven pump, one electric hydraulic pump, one accumulator, one reservoir

Question 2

What type of hydraulic pumps are in system 2?

Answer 2

One engine-driven pump, one electric hydraulic pump, one accumulator, one reservoir, PTU

Question 3

What type of hydraulic pumps are in system 3?

Answer 3

Two electric hydraulic pumps, one accumulator, one reservoir

Question 4

When will EDP1 begin pumping hydraulic fluid? EDP2? Are they automatic?

Answer 4

Each will begin pumping when respective engine is running – yes, it’s automatic. No pilot action

Question 5

If in AUTO, when will ACMP 1 turn on?

Answer 5

IN FLIGHT:
•When either EDP or engine fails
OR
•Flaps selected to any position greater than 0.

ON-GROUND:
•If flaps selected to any position greater than 0, AND thrust levers set to takeoff thrust
OR
•If flaps selected to any position greater than 0, AND ground speed greater than 50 kts

Question 6

If in AUTO, when will ACMP 2 turn on?

Answer 6

IN FLIGHT:

•When either EDP or engine fails
OR
•Flaps selected to any position greater than 0.

ON-GROUND:

•If flaps selected to any position greater than 0, AND thrust levers set to takeoff thrust
OR
•If flaps selected to any position greater than 0, AND ground speed greater than 50 kts
OR
•Engine #1 running, and parking brake released
OR
•During Engine 1 start (once N2 reaches 40%) if parking brake has been applied within the last 6 min.

NOTE: ACMP 2 will be automatically turned off after 6 min have elapsed from parking brake application.

Question 7

If in AUTO, when will ACMP 3B turn on?

Answer 7

In flight ONLY, with the selector knob in the AUTO position, the hydraulic system logic turns on the electric pump 3B whenever pump 3A fails.

Question 8

Which hydraulic system controls nosewheel steering? Landing gear?

Answer 8

Hydraulic system 2

Question 9

What must be accomplished prior to aircraft movement if taxiing on #2 engine only? Why?

Answer 9

ACMP 1 must be turned from AUTO to ON. Primarily, we can taxi without it ON, however, we have 1⁄2 brakes being applied. As such, this could potentially increase brake temps if depressed during long taxis. So, we turn on ACMP 1 in order to help keep brake temps cool for the BRAKE TEMP check during before takeoff checklist.

Question 10

Recite limitations of the hydraulic system (temperature, pressure, qty)

Answer 10

• Minimum hydraulic reservoir temperature for engine start= (-18*c)

Question 11

What aircraft functions utilize the hydraulic system?

Answer 11

Elevator, rudder, ailerons, thrust reverser, multi-function spoilers, ground spoilers, brakes, emergency parking brake, nose wheel steering, landing gear.

Question 12

What is the purpose of the PTU? When will PTU run while in AUTO?

Answer 12

PTU assists with landing gear retraction or extension.

While in AUTO, PTU will activate during following conditions;
• EDP 2 fail
OR
•ENG 2 fail

AND, following conditions met;

• Flaps > 0, EDP 1 not failed, and hydraulic reservoir 2 qty > 12%
OR
Landing gear not up and locked, EDP 1 not failed, and hydraulic reservoir 2 qty > 12%

NOTE: PTU will not be activated while on ground

Question 13

What hydraulic pumps are available during a dual IDG failure? Dual engine Failure?

Answer 13

Dual IDG failure will not allow ACMP 1&2 however, you have EDP 1&2, PTU and ACMP 3A.

Dual engine failure will not allow ACMP 1&2, PTU nor EDP 1&2. However, once RAT is deployed you’ll have ACMP 3A.