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B747 Oral Questions - 13) Hydraulics
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What does the hydraulic system (SYS FAULT) fault light indicate?
Low hyd system pressure
Low hyd reservoir quantity
High fluid temperature
What does a hydraulic demand pump low PRESS light indicate?
Demend pump selector positioned to OFF or AUX
Demand pump operates and output pressure is low
When will the demand pumps be commanded to operate if the hydraulic demand pump selector is in the AUTO position?
Demand pumps operate when related engine pump output is low, or when related fuel control switch is in CUTOFF
Demand pumps 1 & 4 also operate when flaps are in transit on the ground, or flaps extended past flaps 1 in flight
Which Demand pumps are air driven, and which ones are electric motor driven?
System 1 & 4 are Air driven
System 2 & 3 are electric driven pumps
What does a magenta "RF" displayed next to a hydraulic quantity indicator on the secondary EICAS mean?
The reservoir requires refill (only displays on ground)
What is the purpose of the auxiliary pump?
Used for ground handling operations
When is the engine driven hydraulic pump pressurized?
The engine is running
The engine pump switch is ON
What does a hydraulic reservoir quantity indication of 0.95 mean, as displayed on the Secondary EICAS display?
95% of normal service level
What degraded or inoperative systems can you expect from a loss of hydraulic system 1?
Center autopilot
Left outboard elevator
Inboard trailing edge flap hydraulic operation
Nose and body gear hydraulic extension and retraction
Nose and body gear steering
Sys 1 alternate brake source
What degraded or inoperative systems can you expect from a loss of hydraulic system 4?
Right outboard elevator
Outboard trailing edge flap hydraulic operation
2 Inboard spoiler panels on each wing
Wing gear hydraulic extension and retraction
Sys 4 normal brake source
Autobrake
Author
Birddog370
ID
344933
Card Set
B747 Oral Questions - 13) Hydraulics
Description
B747 Oral Questions - 13) Hydraulics
Updated
2019-01-28T01:27:40Z
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