Hydraulics

Question 1

When L/R ELEC demand pump in AUTO, pump operates when: (5)

Answer 1

System low pressure

On the ground for the first three minutes after the second engine is started

From takeoff thrust until flaps retracted

In descent when gear handle down or RA less than 1000 ft until ground speed less than 40 kts

During thrust reverser operation

Question 3

What items cause the RAT to deploy automatically?

Answer 3

In flight, if any of the following:

Both engines have failed

All three hydraulic systems pressures are low

Loss of all electrical power to CA and FO flight instruments

Loss of all four EMPs and faults in flight control system during approach

Loss of all four EMPs and an engine fails on takeoff or landing

Question 5

C1 and C2 Pumps?

Answer 5

Operate as primary or demand pumps

Question 6

Demand pump selected ON:

Answer 6

Pump runs continuously

Question 7

FAULT light in L/R ENG hydraulic switch?

Answer 7

Low pump pressure

High pump fluid temperature

Pump is selected OFF

Question 9

Left and Right EMP roles?

Answer 9

Demand pumps that operate during high load phases of flight and provide system redundancy

Question 10

Demand pump FAULT light?

Answer 10

Low demand pump pressure

High pump fluid temperature

Demand pump selected OFF

Question 12

RF indication?

OF indication?

Answer 12

Requires ReFill

Reservoir Over Filled

Both indications are inhibited in flight

Question 16

How are the hydraulic reservoirs pressurized?

Answer 16

Pump outlet pressure

Question 17

EMP?

Answer 17

Electric Motor-driven Pump

Question 18

C1 and C2 primary pump switches in AUTO position?

Answer 18

Pumps alternate as a primary pump and a demand pump

The primary pump operates continuously

Question 19

When does the C1/C2 pump operate as a demand pump?

Answer 19

System pressure is low

On ground for the first 3 minutes after second engine is started

Takeoff thrust until 2000 ft RA

Flaps and slats in motion

Descent when gear handle down and RA less than 2000 ft until groundspeed less than 60 kt

Question 20

C1 and C2 Pump FAULT?

Answer 20

Low primary pump pressure

High pump fluid temperature

Pump is selected OFF

Question 21

Ram Air Turbine PRESS light?

Answer 21

Illuminated when RAT is deployed

Center primary flight control hydraulic pressure is greater than 3000 psi

Question 22

Ram Air Turbine UNLKD light?

Answer 22

RAT not in stowed position

Question 23

In case of a center hydraulic leak, the system isolates the leak.

Name the valves and components of the isolation function.

Answer 23

Nose Gear Isolation Valve (NGIV)

Reserve Steering Isolation Valve (RSIV)

Alternate Extend Isolation Valve (AEIV)

Reservoir Standpipe

Question 24

What functions does the center hydraulic system leak isolation system protect?

Answer 24

The landing gear can be lowered and the nosewheel steering is operational for landing, rollout and taxi