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The hydraulic system supplies pressure for the operation of what? 10-1
Flaps, Landing gear, Brakes, and Nose wheel steering
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Are Hydraulic lines routed to their respective systems inside the aircraft? 10-1
No, they are routed externally in “hydraulic tunnels”
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What pressurizes the main hydraulic reservoir? 10-2
Emergency accumulator circuit
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What is the back up to the emergency accumulator for pressurizing the reservoir? 10-2
Spring loaded piston
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What would cause a HYDR CWP light to illuminate with all gauges normal? 10-2
High temperature has been noted in the main reservoir (116ºC)
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What supplies hydraulic fluid to the Hand Pump reservoir? 10-2
Overflow fluid from the main reservoir
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What does the Hand Pump reservoir supply fluid to? 10-2
Hand Pump
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What does the main reservoir supply fluid to? 10-2
- Electric hydraulic pump
- Overflows to the Hand Pump Reservoir
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What is the normal source of pressure for the hydraulic system? 10-2
Electric pump
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What electrical bus supplies power to the electric pump in AUTO? 10-2
Left main bus
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What electrical bus supplies power to the electrical pump in OVRD? 10-2
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? 10-2
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? 10-2&3
Yes, with the hand pump
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What does the Main Accumulator supply pressure to? 10-3
- 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? 10-3
3750 psi
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Is there protection for an overpressure of the hydraulic system? 10-3
Yes the pressure relief valve
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Where does the Pressure relief valve return fluid to? 10-3
To the main reservoir
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Where does the Fluid from the hand pump get returned to after use? 10-3
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? 10-3
A leak in the inboard brake
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What is the normal operating pressure in AUTO mode? 10-4
2100 psi-2900 psi
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What is the operating pressure when the pump is in OVRD? 10-4
3000 psi
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What causes the electric pump to automatically activate? 10-4
- 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? 10-4
All accumulators except the Emergency accumulator
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The selector valve facilitates pressure of what? 10-4
Main, Inboard brake, and Outboard brake accumulators
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Can the landing gear be hand pumped down with a total electrical failure? 10-4
No, the gear requires left battery bus power to operate the selector valve
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Can the flaps be hand pumped with a total electrical failure? 10-4
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? 10-3&5
No, the Main accumulator will equalize to the leaking brake accumulator
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Which accumulators have check valves? 10-5
Emergency, Inboard and Outboard brake accumulators
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What is the pressure of the nitrogen pre-charge in the accumulators? 10-5
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? 10-5
Zero psi on the gauges in the flight deck. The actual accumulators should read 1650psi in the nose well
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What is the purpose of the Nitrogen charged accumulators? 10-5
To absorb pump pulsations and surges caused by large fluid demands
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What pressure triggers a HYDR CWP light to illuminate? 10-2&5
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? 10-5
Main and Emergency accumulators
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What is the Purpose of the Emergency accumulator? 10-2&5
- Emergency extension for up lock release
- To pressurize the Main reservoir
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What is the indication for a hydraulic filter that is clogged and bypassed? 10-5
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? 10-5
The Main accumulator
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How many hydraulic accumulators are on the Saab 340? 10-5
4
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Why do the brakes have 2 accumulators? 10-5
One for inboard and one for outboard brake systems in case of a leak in one system brakes are still available
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What does the Emergency landing gear extension use hydraulic pressure for? 10-5
To release the up locks and allow the gear to free fall
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Can the flaps be extended AND retracted with only the Hand Pump? 10-5
Yes, by pressurizing the main accumulator
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Where can the 1650 psi Nitrogen pressure be checked? 10-6
Nose wheel well, right side of the aircraft
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Where are the hydraulic filter bypass pins located? 10-6
Nose wheel well on the left side of the aircraft
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What does an illuminated HYDR CWP light indicate? 10-7
- Pressure in the main or emergency accumulators less than 1850 psi
- High temp in the main reservoir (116ºC)
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Does the HYDR CWP light illuminate for low quantity? 10-7
No
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Does the HYDR CWP light illuminate for high pressure? 10-7
No
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Where is the Hand Pump handle stored? 10-8
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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