Hydraulics Flashcards
What type of demand pumps are in the LEFT and RIGHT hydraulic systems?
Electrically driven
What type of demand pump powers the CENTRE hydraulic system?
Air driven
Hydraulics powers the: a) Flaps / slats b) Landing gear c) Tailskid d) Nose wheel steering e) Brakes f) Flight controls g) A/P servos
a, b, c, d, e, f g
What action is required to turn off a demand hydraulic pump?
Rotate the selector to OFF
What is indicated when one hydraulic pump ‘PRESS’ light comes on?
Pump output pressure low
With the selector in AUTO, when will the LEFT and RIGHT demand pumps operate?
When engine pump pressure is low
What is indicated when a demand pump low pressure light illuminates with the demand pump selector in the AUTO position?
Pump signalled to operate, pump pressure is low
Which of the following affect the operation of the air-driven demand pump?
Landing gear retraction
The Ram Air Turbine (RAT) can be retracted in flight.
False
What does illumination of the QTY light indicate about the quantity of fluid in the hydraulic reservoir?
Low reservoir quantity
Which hydraulic system pump powers the Reserve Brakes and Steering?
Number one electric pump
Which reservoir contains the hydraulic fluid for Reserve Brakes and Steering?
Centre
Independent reservoirs fluid pressurized by bleed air to ensure positive fluid flow.
True
How does pulling the Engine Fire switch affect the hydraulic system?
Shuts off fluid to the engine pump and depressurizes the pump.
Which hydraulic systems flight controls are powered by the Ram Air Turbine?
Centre
What is the lowest airspeed that the Ram Air Turbine can provide adequate power for flight control operation?
130 knots
Which of the following will shut off the flow of hydraulic fluid to the LEFT engine pump?
Pull the LEFT engine fire switch
When does the Ram Air Turbine deploy automatically?
Inflight when both engines fail
Which one of the following indicates the Ram Air Turbine is producing hydraulic power?
RAT pressure light illuminated
Which of the following indicates a hydraulic pump overheat?
An illuminated pump overheat light
What systems are supplied hydraulic pressure by the Ram Air Turbine (RAT)?
Flight controls
Which condition requires use of the Reserve Brakes and Steering switch?
Loss of CENTRE hydraulic system
What is the effect on the CENTRE hydraulic system when the RAT is deployed?
Only primary flight controls remain powered
What powers the RIGHT and LEFT hydraulic systems?
Engine driven primary pump and demand electric motor driven pump
What system can be pressurized by the RAT pump?
Centre
You have arrived at airplane for the first flight of the day. Electrical power is connected. Engines not started. In this situation, what would you do to ensure adequate brake pressure
Turn on the R ELEC pump switch
In what position should the LEFT and RIGHT hydraulic system demand pumps be set for normal flight operations?
AUTO
Which systems are backed up by the fluid below the stand pipe in the CENTRE hydraulic system?
Reserve brakes and Steering
Centre hydraulic system provide power (if both Main AC buses are lost) to the Hydraulic Driven Generator (HDG).
True
N°2 electric pump is inhibited with:
Only 1 generator operating, Both CENTRE electric pump switches ON, LEFT and RIGHT demand pumps operating
The Air pump is overheating.
C HYD DEM PUMP OVHT light illuminates, EICAS C HYD DEM OVHT advisory message appears, corresponding reservoir temperature on EICAS increases abnormally (EICAS ELEC/HYD maintenance page)
Right RSVR light and R HYD QTY advisory EICAS message appear. Given these indications, you suspect a slow leak or low reservoir level. How can this be confirmed?
Select EICAS status page, observe Right system at .31RF
