50 Questions
Which component prevents damage from high system pressure in the hydraulic system?
The pressure relief valve
Where is the hydraulic system service bay located?
In the lower aft fuselage behind the right wing trailing edge
What does the hydraulic pump pressurize in the system?
The normal system and emergency accumulator
At what pressure does the hydraulic pressure display change from white to amber?
1800 psi
What does an amber HYD FL LO caution indicate on the EICAS display?
The fluid level is low
How is the hydraulic fluid level checked in the hydraulic system service bay?
By comparing the position of the green indicating rod to marked indicator windows
What should be done if the fluid level is not FULL AC or FULL AD?
Depressurize the emergency accumulator
What should happen to the fluid level in the reservoir as the accumulator discharges?
It should increase
When should the hydraulic system be serviced?
When the accumulator is fully discharged
What is the capacity of the engine-driven pump in the hydraulic system?
Approximately 5 quarts
Where is the circuit breaker for the hydraulic system located?
On the battery bus circuit breaker panel in the front cockpit
What happens when the circuit breaker for the hydraulic system is open?
The pressure indication and HYD FL LO sensor is not available
How is the emergency hydraulic pressure activated?
By pulling the emergency gear extension handle in the front cockpit
What is the indication of the emergency accumulator's status?
An amber EHYD PX LO caution on the EICAS
What prevents the emergency system from bleeding back into the main system?
A check valve
What is the maximum fluid loss allowed in the event of an emergency hydraulic system leak?
20-30 cubic inches (0.5 quart)
When will the HYD FL LO caution illuminate?
When there is insufficient fluid in the main reservoir
What happens if the leak rate in the emergency system is below.25 GPM?
The system depletes the main reservoir until the HYD FL LO caution illuminates
What is the purpose of the landing gear system?
To retract and extend the landing gear
What are the major components of the landing gear system?
Two main landing gear, outboard gear doors, inboard gear doors, and a steerable nose gear
What happens to the flaps if power to the flap control circuit is lost?
The flaps will retract to the UP position
Where is the emergency selector valve located?
In the hydraulic power system emergency manifold
What happens to the flaps after emergency extension until the aircraft is serviced by maintenance?
The flaps can be retracted
What does the position pointer on the flap indicator indicate?
Flap motion
What is the maximum deflection of the speed brake?
70°
When will the speed brake automatically retract?
When the FLAPS selector is moved out of the UP position
Which component prevents damage from high system pressure in the hydraulic system?
The pressure relief valve
What is the capacity of the engine-driven pump in the hydraulic system?
5 quarts
Where is the hydraulic system service bay located?
In the lower aft fuselage behind the right wing trailing edge
What is the indication of the emergency accumulator's status?
The position of the green indicating rod
What should be done if the fluid level is not FULL AC or FULL AD?
Service the system
When will the HYD FL LO caution illuminate?
When the accumulator is fully discharged
Which type of steering is used for the nose wheel of the aircraft?
Free castoring steering
What is the purpose of the friction collar on the nose landing gear strut cylinder?
To provide additional shimmy damping
Where is the power for the nose wheel steering system provided from?
Generator bus
What should be done if the nose wheel steering system fails to respond to pilot input?
Disengage the system
What should be done if there is a known failure of the nose wheel steering system during takeoff?
Disengage the system
What is the source of electrical power for the flap system?
Battery bus
Which component prevents movement of the landing gear selector handle when the right weight-on-wheels switch is energized?
The downlock solenoid
What is the purpose of the downlock override button?
To raise the landing gear handle when the right weight-on-wheels switch is energized
What is the maximum fluid loss allowed in the event of an emergency hydraulic system leak?
20-30 cubic inches (0.5 quart)
What is the indication of the emergency accumulator's status?
Amber EHYD PX LO caution on the EICAS
Where is the circuit breaker for the hydraulic system located?
On the battery bus circuit breaker panel in the front cockpit
What is the indication of the gear handle and red indicator lights?
The nose gear is in transit or main gear doors are not closed
Which component is responsible for opening the inboard main gear doors in the landing gear system?
The hydraulic actuator
What locks the nose gear in the down position during landing gear extension?
The over-center position of the folding strut
What cockpit indications confirm that the landing gear is fully down and locked?
All of the above
What activates the aural landing gear position warning?
All of the above
When can the warning horn be silenced using the WARNING SILENCE button?
When the gear handle is raised with flaps LDG
How is directional control during taxi accomplished?
All of the above
Test your knowledge of hydraulic systems and their components with this quiz. Learn about the engine-driven pump, pressure relief valve, and other important features.
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