SY110/111 - Hydraulic System 1&2 Flashcards
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The primary hydraulic system operates the following devices in normal flight operations (5):
Landing gear Main landing gear inboard doors Flaps Speed brake Nose wheel steering (NWS)
The hydraulic system is pressurized to _____ +/- ____
3000 +/-120
What are the 3 positions of the fluid level indicator rod?
Full AC (Accumulator Charged) Full AD (Discharged) Fill
Hydraulic systems can be used once the system exceeds _____ psi
1800 psi
The engine driven hydraulic pump is located in the _______ compartment
engine compartment
The hydraulic pressure distributes pressure to the reservoir in the ______ ______ onward to the individual selector valves in the ______ ______ and finally to the _______ _______
Power Package
Selector Manifold
Emergency System
The resevoir in the power package steps 3000 psi down to ____ psi to prevent fluid flowing back through the system and causing damage.
50 psi
The Power Package contains a Pressure Release Valve that operates at ______ to ______ psi that helps avoid overpressure.
3250 to 3500
The Power Package also contains a Slide Valve Assembly. Its purpose is to _______________
Isolate the hydraulic pressure coming from the engine-driven pump, through the power package, from the rest of the hydraulic system when the emergency system is activated.
Pulling the landing gear emergency extension handle activates it and isolates the main system.
If the emergency extension handle is pulled, the hydraulic pump pressure is prevented from energizing any hydraulic components except for the ____________
Nose Wheel Steering
Once the emergency landing gear handle is activated, how is the system reset?
It can only be reset by maintenance
What is the purpose of the Electrical Selector Valves (controlled by the Selector Manifold)?
Each electrical selector valve connects to an actuator that physically moves the landing gear, main inboard gear doors, flaps, or speed brake.
What is the Hydraulic Scale (and counter) range for the green, white, and amber arc?
Scales:
Green 2880-3120
White 1800-3500 (excluding green)
Amber 1700-1800 and 3500-3600
Counters:
White counter 1800-3500
Amber counter 0-1790 and 3510-4100
If the hydraulic fluid level in the reservoir drops below _____ qt, the annunciator panel will display an amber HYDR FL LO light.
1 qt
Which 3 events will the emergency extension of the landing gear be used?
Primary Hydraulic System Failure
Engine Failure
Battery Bus Failure
After engine start the prmary system will continously keep the emergency system pressurized through a one-way ______ ______
Check Valve
What provides the emergency pressure to move the actuators without electrical power?
Compressed Helium in the Emergency Accumulator
The Pressure Release Valve in the Emergency Package will automatically operate to release excessive hydraulic pressure if it reaches _____ psi
3500
A hydraulic fuse located between the normal and emergency hydraulic systems will shut off flow if the leak exceeds ____ gal per min or maximum of ___ to ___ cubic inches (about 1 pint)
.25 gallons per min
20 to 30 cubic inches
If the pressure in the emergency accumulator drops below _____ +/- ____ psi, the amber EHYD PX LO light illuminates on the annunciator panel
2400 +/-150 psi
Each gear leg is an ___-_________ shock absorber
oleo-pneumatic
Gear extension/retraction takes approximately ___ seconds
6 seconds
The gear handle will illuminate red to indicate one of the following conditions (2):
The main gear inboard doors are not closed
The PCL is approaching IDLE with the gear handle UP
A red gear light is illuminated whenever (2):
The gear or inboard gear doors (main gear only) are in transit
The PCL is approaching IDLE and the gear handle is UP regardless of airspeed
The aural landing gear warning will be heard for the following conditions (3):
Gear handle not DOWN (regardless of gear indications), PCL below a mid-range position (approx 87% N1), airspeed below 120 KIAS, and flaps UP or TAKEOFF
All gear not indicating down and locked with the flaps LDG (regardless of gear door positions, power setting or airspeed)
There is weight on the wheels with the gear handle now DOWN
The WARNING SILENCE may be activated to stop the aural warning, except the following conditions (2):
Gear UP and flaps LDG
Gear handle UP with aircraft on the ground
When the aural warning sound is active, The WARNING silence button will silence during the following condition:
Airspeed is above 120 knots,
PCL below approximately 87% N1,
and subsequently the aircraft is slowed below 120 knots.
When the weight-on-wheels switch senses the aircraft on the ground, the _______ _______ prevents movement of the landing gear select handle.
Downlock Solenoid
What is the purpose of the Downlock Override button?
When the aircraft is airborne and use of the button is necessary (emergency situation), the landing gear selector handle can be raised and the landing gear will retract.
What is the procedure for lowering the landing gear and flaps using the emergency package?
- Reduce airspeed to 150 KIAS or below
- Landing Gear Handle - DOWN
- Emergency Landing Gear Handle - PULL
- Confirm Proper Configuration (3 green, 2 red main gear doors, red gear handle)
- Flaps - As required
Flaps are used to produce an increase or decrease in the aerodynamic forces called _____ and _____
Lift and Drag
How many Eletrical Selector Valves does the flap hydraulic system utilize?
Two (TO and LDG settings)
If the battery bus has failed, is flap extension possible?
No. Neither normal nor emergency flap operation and position indication are available when the AUX BAT is the only source of electrical power.
If the flap position indicator fails, how can a pilot determine the extension of the flaps?
A slight tendency for the nose to pitch up
Before operating the flaps using the emergency system, you must _______________________.
lower the landing gear using the emergency system.
The purposes of the speed brake are (2):
Decelerate
Increase descent rate without increasing airspeed
Once extended, the speed brake remains extended until any of the 3 things take place:
The speed brake switch is moved forward
The flaps are extended to the landing or takeoff position
The power control lever is moved to MAX
To help counteract pitch change, the speed brake is interconnected to the ______ ______ ______ ______ through a flexible cable system to automatically input pitch trim changes when the speed brake is operated.
Elevator Trim Tab Actuator
3 methods of steering the aircraft:
Through the application of differential braking
Operating of the hydraulic nose wheel steering system
Through use of the rudder (with sufficient propwash or airflow)
When NWS is off, the nose wheel is free castering, turning on its own up to ___º in either dirrection.
When selecting the NWS, the nose wheel can turn up to ___º
80º
12º
The _____ _____ returns the nose wheel to a centered position before it is extended/retracted
Centering Valve
Where are the master cylinders for the brake system located?
Bulkhead frame forward of the aft instrument panel
Each brake unit is a disc brake with ___ pistons and ___ discs
6 pistons
2 discs
How do you activate the parking brake?
Apply toe brakes while simultaneously pulling and turning the parking brake handle 90º clockwise
Where is the SPEED BRAKE circuit breaker located?
Generator Bus
Nose wheel steering operates using three types of power:*
Hydraulic
Electric
Mechanical
Nose wheel steering system components*
Actuator Assembly (actually turns the strut) Selector control valve (is moved by the servos to allow the hydraulics to affect the actuator) Servo valve (moves the selector control valve)
