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The hydraulic system supplies pressure for the operation of what
Flaps, Landing Gear, Brakes, and Nose Wheel Steering
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Are Hydraulic lines routed to their respective systems inside the aircraft
No, they are routed externally in "hydraulic tunnels"
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What pressurizes the main hydraulic reservoir
Emergency accumulator circuit
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What is the back up to the emergency accumulator for pressurizing the reservoir
Spring loaded piston
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What would cause a HYDR CWP light to illuminate with all gauges normal
High Temperature (above 116C) in main reservoir
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What supplies hydraulic fluid to the Hand Pump Reservoir
Overflow fluid from the main reservoir
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What does the Hand Pump reservoir supply fluid to
Hand Pump
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What does the main reservoir supply fluid to
- Electric hydraulic pump
- Overflows to the Hand Pump Reservoir
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What is the normal source of pressure for the hydraulic system
Electric pump
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What electrical bus supplies power to the electric pump in AUTO
Left main bus
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What electrical bus supplies power to the electrical pump in OVRD
Left essential bus
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Why is it important to verify the BUS TIE CONN light illuminates during left engine shutdown while taxiing
Hydraulic pump is powered from the left main bus
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With a failure of the electric hydraulic pump can the main accumulator be pressurized
Yes, with the hand pump
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What does the Main Accumulator supply pressure to
- Nose wheel steering
- Flap actuation
- Gear retraction and extension
- To pressurize the brake accumulators
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At what pressure does the Pressure relief valve vent pressure
3750 PSI
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Is there protection for an overpressure of the hydraulic system
Yes the pressure relief valve
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Where does the Pressure relief valve return fluid to
To the main reservoir
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Where does the Fluid from the hand pump get returned to after use
Main reservoir
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What is the most likely problem if a HYDR CWP light is illuminated and hydraulic quantity, main accumulator, and inboard accumulator pressure all indicate low
A leak in the inboard brake
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What is the normal operating pressure in AUTO mode
2100 psi- 2900 psi
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What is the operating pressure when the pump is in OVRD
3000 psi
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What causes the electric pump to automatically activate
- Pressure in the main accumulator decreases below 2100 psi
- Landing gear is extended or retracted
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What can the Hand Pump pressurize
All accumulators except the Emergency accumulator
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The selector valve facilitates pressure of what
Main, Inboard brake, and Outboard brake accumulators
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Can the landing gear be hand pumped down with a total electrical failure
No, the gear requires lef battery bus power to operate the selector valve
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Can the flaps be hand pumped with a total electical failure
No, flap operation requires left battery bus to be powered
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With an outboard brake accumulator leak, can the main accumulator be pressurized by the Hand Pump
No, the Main accumulator will equalize to the leaking brake accumulator
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Which accumulators have check valves
Emergency, Inboard and Outboard brake accumulators
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What is the pressure of he nitrogen pre-charge in the accumulators
1650 PSI
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What pressure is read on the gauges if hydraulic qty in the accumulator decreases to zero, leaving just the nitrogen pre-charge pressure
- Zero psi on the flight deck gauges
- Actual accumulators should read 1650 psi in the nose well
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What is the purpose of the Nitrogen charged accumulators
To absorb pump pulsations and surges caused by large fluid demands
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What pressure triggers a HYDR CWP light to illuminate
Pressure less than 1850 psi, or High Temp
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Which accumulators will trigger the HYDR CWP light to illuminate with pressure below 1850 psi
Main and Emergency accumulators
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What is the purpose of the Emergency accumulator
- Emergency extension for up lock release
- To pressurized the Main reservoir
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What is the indication for a hydraulic filter that is clogged and bypassed
Clog indicator button pops up on the filter housing
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What is being pressurized by the Hand Pump when the selector is in the FLAPS LDG GR position
The Main Accumulator
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How many hydraulic accumulators are on the Saab 340
4
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Why do the brakes have 2 accumulators
One for inboard and one for outboard brake systems. In case of a leak in one sysem, brakes are still available
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What does the Emergency landing gear extension use hydraulic pressure for
To release the up locks and allow the gear to free fall
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Can the flaps be etended AND retracted with only the Hand Pump
Yes, by pressurizing the main accumulator
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Where can the 1650 psi Nitrogen pressure be checked
Nose wheel well, right side of the aircraft
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Where are the hydaulic filter bypass pins located
Nose wheel well on the left side of the aircraft
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What does an illumiated HYDR CWP light indicate
- Pressure in the main or emergency accumulators less than 1850 psi
- High Temp in the main reservoir (116C)
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Does the HYDR CWP light illuminate for low quantity
No
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Does the HYDR CWP light illuminate for the high pressure
No
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Where is the Hand Pump handle stored
Behind the First Officer seat on the bulkhead
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Is the electric hydraulic pump protected by a resettable circuit breaker
No
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