Hydraulic System Flashcards
How many hydraulic pumps does the CL-300/350 have?
6 total
2 EDP’s
2 DCMP’s
1 PTU
1 AUX
What is powered using the hydraulic system?
(7)
Brakes Thrust Reversers Flaps Elevators Rudder Multi Function/Ground Spoilers NWS
Normal hydraulic system pressure is psi?
3000
What does the Left Hydraulic System power?
(9)
nail iill
Nose steering
Alternate flaps
Inboard Elevator
Landing Gear
Inboard Spoilers
Inboard Brakes
Left(upper)PCU
Left TR
What does the Right Hydraulic System power?
(9)
floormop
Flaps Lower PCU Outboard spoilers Outboard brakes Right TR
Main landing gear assist actuator
Outboard Elevator.
PTU
What is the purpose of the PTU?
It is a hydraulic motor driven from the right system to provide pressure to the left system primarily to retract the gear after takeoff with a left engine failure.
Also pressurizes the left hydraulic reservoir.
When does the PTU operate in “AUTO” ?
- Left EDP failed
- Right EDP producing pressure.
- Weight off wheels(WOW in air)
- Gear not in the selected position (ie…gear is down with the handle “UP”)
How is hydraulic fluid cooled?
Via fuel / hydraulic heat exchanger in each wing tank.
Hydraulic SOV can be closed 3 ways?
Pushing the Hydraulic PBA
Pushing the FIRE PBA
hydraulic temperature exceeds 135C (275F) for more than 3 seconds.
What is the purpose of the Aux HYD system?
To provide hydraulic pressure to the lower rudder pcu if the right hydraulic system loses pressure(less than 1800 psi)
In the event generator power fails and both EDP’s fail, which DCMP is not load shed and can be powered?
The right DCMP if switch is selected to ON
When would we use the Alternate flaps?
When directed by the checklist for Right hydraulic pressure low conditions or Flap Fault CAS
After loss of the left and right hydraulic systems, what flight control is powered by the Aux hydraulic system?
The rudder thru the lower rudder pcu
What accumulators are on the hydraulic system?
4 – Inboard brakes Outboard brakes Aux system Main gear down lock assist.
Why does flap extension using only the Right DCMP or Alternate Flaps take much longer than normal?
EDP pumps approximately 20 gpm
DCMP pumps approximately 3 gpm.
When does the Aux Hydraulic pump automatically turn ON?
(2)
Aux system pressure less than 2500 psi
(OFF at 3350 psi)
Right hydraulic system pressure is less than 1800 psi
When do the DCMP’s operate in the auto position?
(3)
Low hydraulic system pressure
When flaps are selected out of 0 (zero)
On the ground with NWS ON(Left)
From which electrical buses are the Right and Left DCMP’s powered?
Right DCMP is powered from L ESS bus
Left DCMP is powered from R Main bus.
A/C not modified SB 100-29-18 (Brushless DCMP’s), What position do we place the DCMP switch after takeoff?
OFF - to prevent short circuits in a high temp environment that could lead to a cascade electrical failure.
On CL350’s and A/C with modified with SB 100-29-18 (Brushless DCMP’s) what position do we place the DCMP switch after takeoff??
Remain in the “AUTO” position.
The Aux DCMP is powered by the?
LEFT essential bus
If you loose all the hydraulic fluid on the left side will the gear still come up with the PTU?
No. The PTU is turned with the right side hydraulic system (so it will still turn) but it is powering the left side fluid, so if none of that remains the gear will not come up.
