Hydraulics

Question 1

What does the hydraulic system (SYS FAULT) light indicate?

Answer 1

Low hydraulic reservoir quantity
Low hydraulic system pressure
Excessive hydraulic fluid temp

“Two lows and a high”

Question 2

What does a hydraulic demand pump low PRESS light indicate?

Answer 2

Demand pump selector positioned to OFF or AUX

Demand pump operates and output pressure is low

Question 3

When will the demand pumps be commanded to operate if the hydraulic demand pump selector is in the AUTO position?

Answer 3

Engine pump output pressure low
Fuel control switch in CUTOFF
1&4 when trailing edge flaps are in transit on the ground, or continuously when extended past 1 in flight

Question 4

On GE -400 aircraft, which demand pumps are air driven, and which ones are electric motor driven?

Answer 4

Systems 1 & 4 are air driven pumps
Systems 2 & 3 are electric driven pumps

Question 5

On N480MC/N445/446MC which demand pumps are air driven, and which ones are electric motor driven?

Answer 5

There are no electric driven demand pumps, systems 1,2,3 and 4 are pneumatic air driven demand pumps

Question 6

What does magenta RF displayed next to a hydraulic quantity indicator on the secondary EICAS mean?

Answer 6

Reservoir requires refill (displayed only on ground)

Question 7

What is the purpose of the auxiliary pump?

Answer 7

Used for ground handling operations

Question 8

When is the engine driven hydraulic pump pressurized?

Answer 8

Engine is running
Engine pump switch is ON

Question 9

What does a hydraulic reservoir quantity indication of .95 mean, as displayed on the secondary EICAS display?

Answer 9

Percentage of normal service level (1.00)

Question 10

What degraded or inoperative systems can you expect from a loss of hydraulic system 1?

Answer 10

-Center autopilot INOP
-Left outboard elevator INOP
-Inboard trailing edge flap hydraulic operation INOP
-Nose and body gear hydraulic steering and hydraulic actuation INOP
-System 1 alternate brake source INOP

Question 11

What degraded or inoperative systems can you expect from a loss of hydraulic system 4?

Answer 11

-Right outboard elevator INOP
-Outboard trailing edge flap hydraulic operation INOP
-Two inboard spoiler panels on each wing INOP
-Wing gear hydraulic actuation INOP
-System 4 normal brake source INOP
-Autobrake INOP