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What is a PTU?
Power transfer unit
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Which system(s) are powered by the right hydraulic system?
- Outboard multifunctional spoilers,
- outboard ground spoilers,
- lower rudder PCU,
- right thrust reverser,
- outboard brakes,
- main landing gear assist actuators,
- outboard elevator PCUs,
- normal flap supply,
- power transfer unit
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At what pressure does the hydraulic system normally operate?
3000 psi
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Which electrical source powers the right DCMP?
Left generator
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What primary flight controls are hydraulically powered?
All of them except the ailerons
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What is the main purpose of the PTU?
To retract the gear in the event of a left engine-driven pump failure
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Are normal brakes still operational in the event of a left and right hydraulic failure?
Yes, because of the accumulators
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Which system(s) are powered by the auxiliary hydraulic system?
Lower rudder PCU
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What causes the auxiliary hydraulic system to power the lower rudder PCU?
Failure of the right hydraulic system
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How much fluid do the left and right reservoirs contain?
- Left: 13 quarts;
- right: 9 quarts
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Why is there more fluid in the left reservoir than in the right?
Gear movement requires more fluid
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What memory item(s) apply for a red HYD PRESS LOW (W) CAS message?
There are no memory items for this message
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What type of hydraulic fluid is used in the Challenger 350 aircraft?
Phosphate Ester Fire-Resistan tper BAMS 564-003 Type IV, Skydrol LD-4, Hyjet IV-a Plus is approved for use
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Where is the hydraulic EDP located?
On the engine accessory gearbox
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During what condition(s)does the PTU operate?
Left engine-driven pump (EDP) failure, airborne, gear disagree
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What does the PTU power?
Gear and hydraulic motor-driven generator (HMDG) (optional equipment)
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Which electrical source powers the left DCMP?
Right generator
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From where does the PTU obtain pressure?
Right side hydraulic system
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Are all the multifunctional spoilers operative after a right hydraulic system failure?
No. Outboard flight spoilers are no longer operative.
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What is the purpose of the AUX hydraulic pump?
To power the lower rudder PCU in the event of a right engine failure
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From where do the left and right DCMPs obtain power?
Right: left ESS bus
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What powers the lower rudder PCU during a right system failure?
AUX hydraulic system
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Which system(s) are powered by the left hydraulic system?
- Inboard multifunctional spoilers,
- inboard ground spoilers,
- upper rudder PCU,
- left thrust reverser,
- inboard emergency brakes,
- nosewheel steering actuator,
- inboard elevator PCUs,
- alternate flaps,
- landing gear
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How many hydraulic pumps are installed?
- Six:
- two engine-driven pumps (EDPs),
- two direct current motor pumps (DCMPs),
- one auxiliary pump,
- one power transfer unit (PTU)
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