Hydraulic Systems

Question 1

What does the HYD SYS FAULT light indicate? (3 Items)

Answer 1

Hydraulic System Reservoir Quantity Low,
Hydraullic Output Pressure Low, or
Hydraulic Fluid Temperature High

Question 2

What does a Hydraulic Demand pump ‘PRESS’ light indicate? (2 Items)

Answer 2

Demand Pump selector is OFF or AUX, or
Demand Pump Operates and Output Pressure is low.

Question 3

When will Demand Pumps be commanded to operate in the AUTO position? (2 Items)

Answer 3

Demand Pumps operate when EDP output pressure is low, or respective Fuel Control Switch is in CUTOFF, and

Demand Pumps 1 & 4 operate when TE Flaps are in transit on the ground, or continuously when extended past Flaps 1 in flight.

Question 4

On GE 747-400 Aircraft, which Demand Pumps are Air Driven, and which Demand Pumps are Electrically Driven?

Answer 4

1 & 4 Demand Pumps are Air Driven, and
2 & 3 Demand Pumps are Electrically Driven.

Question 5

On N480MC, N445MC, and N446MC, how are the Demand Pumps driven?

Answer 5

All 4 Demand Pumps are Air Driven

Question 6

What does a Magenta ‘RF’ next to Hydraulic Quantity Indicate?

Answer 6

Refill Required. Only Displays on the ground.

Question 7

What is the purpose of the AUX pump?

Answer 7

Used for Ground Handling Operations.

Question 8

When is the EDP pressurized? (2 Items)

Answer 8

When the EDP is selected on, and
The Engine is running

Question 9

What does a Hydraulic Reservoir Quantity of 0.95 mean on the Secondary EICAS?

Answer 9

Percentage of normal service level.

Question 10

What systems are affected by Hydraulic System 1?

Answer 10

Center Autopilot
Left Outboard Elevator
Inboard Trailing Edge Flaps (Primary Mode)
Nose and Body Gear Normal Extension and Retraction
Nose Gear Steering
System 1 Alternate Brake Source

Question 11

What Systems are affected by Hydraulic System 4?

Answer 11

Right Outboard Elevator
Outboard Trailing Edge Flap (Primary Mode)