Hydraulics COPY Flashcards
What are min pumps and backup pumps for each Hydraulic system
Sys 1 and Sys 2 = Engine driven pump
Sys 1 backup is PTU
Sys 2 backup is AC pump
Sys 3 backup is 2 AC pumps
Where are located hydraulic system service panels?
What you switch on w HYDRAULIC 3A 3B 2B switches?
Hydr 3 and backup pumps
How are hydraulic systems pressurised when hydraulic pumps are not working
With accumulator pressurised with nitrogen
How are hydraulic systems cooled?
With fuel - hydraulic heat exchangers, hydraulics are cooled w fuel
How can hydraulic 1 and hydraulic 2 SOVs can be closed?
With Hydraulic SOV switches or ENG fire button
When the AC backup pumps start operating?
When EDP fails or in high system demand
How is RAT deployed?
With Hydraulic System 3 that is pressurized by AC accumulators
When does RAT automatically deploy?
Total loss of AC power in flight
What happen when Hydraulic switch 2B or 3 B is selected ON not Auto?
Produces hydraulic pressure if fluid quantity is at least 5%
At what temperature amber hydraulic hi temperature is displayed in EICAS?
107 deg celsius
At what temperature the EDP closes the Hydraulic SOVs automatically?
At 125 c
At what pressure drop the priority valves tart to maintain minimum pressure?
At 1700 psi
