Hydraulic System Flashcards
How many hydraulic pumps does the CL300/350 have?
6 total 2 EDPs 2 DCMPs PTU AUX Pump
What is powered using the Hydraulic System?
Brakes Thrust Reversers Flaps Elevators Rudder Multi-Function/Ground Spoilers NWS
What is the normal hydraulic system pressure?
3000 PSI
What does the left hydraulic system power?
Gear Inboard MFS Inboard Brakes Left (Upper) PCU Alt Flaps Inboard Ground Spoilers Left TR Nosewheel Steering Inboard Elevator PCUs
What does the right hydraulic system power?
Flaps Outboard MFS Outboard Brakes Outboard Ground Spoilers Lower PCU Outboard elevator PCUs Right TR PTU Main Landing Gear Assist Actuator
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. It also pressurizes the left hydraulic reservoir
When does the PTU operate in AUTO?
Left EDP failed
Right EDP providing pressure
Weight OFF Wheels
Gear not in the selected position
How is hydraulic fluid cooled?
Via fuel/hydraulic heat exchanger in each wing tank
Hydraulic SOV can be closed in what 3 ways?
Hydraulic PBA
FIRE PBA
Hydraulic temp exceeds 135*C 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 (<1800psi) - via a switching valve
In the event generator power fails and both EDPs fail, which DCMP is not load shed and can be powered?
Right DCMP if switch is selected to ON
When should we use 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 HYD system?
Rudder through the lower rudder PCU
What accumulators are on the hydraulic system?
4 total:
Inboard/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, while the DCMPs only pump around 3 gpm
When does the AUX HYD pump automatically turn on?
Aux system pressure less than 2500psi (off at 3350psi), right hydraulic system pressure less than 1800psi
When do the DCMPs operate in the auto position?
- Low hydraulic system pressure
- Flaps are selected out of 0 (zero)
- On the ground with NWS ON (Left)
From which electrical buses are the Right and Left DCMPs powered?
Right DCMP = L ESS BUS
Left DCMP = R MAIN BUS
A/C without the brushless DCMP mod, 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
CL350 and A/C with the brushless DCMP mod, what position do we place the DCMP switch after takeoff?
Remains in AUTO position
