Hydraulics

Question 1

What systems can power the…GEAR

Answer 1

L / PTU / EMERGENCY BOTTLE

Question 2

What systems can power the…BRAKES

Answer 2

L / PTU / AUX / BRAKE ACCUMULATOR

Question 3

What systems can power the…FLAPS

Answer 3

L / PTU / AUX

Question 4

What systems can power the…NOSE STEERING

Answer 4

L / PTU / AUX

Question 5

What systems can power the…GROUND SPOILERS

Answer 5

L / R

Question 6

What systems can power the…GROUND SPOILER Pop Up (electro-hyd servo valves)

Answer 6

L / PTU / AUX

Question 7

When armed, the PTU operates automatically ON when?

Answer 7

L HYD pressure < 1500 psi
Limit: R HYD <= 104 C and L HYD >= 1 gal

Question 8

When armed, the AUX pump comes on auto when?

Answer 8

L HYD pressure and PTU pressure < 1500 psi, and
Brake pedal depressed 10° (pump locks on)

Question 9

Brake Accumulator pre-charge

Answer 9

1200 psi

Question 10

Emergency Gear Blowdown accumulator pressure charge

Answer 10

3100 psi

Question 11

How to turn off the L / R Hydraulic System (to get 0 psi)

Answer 11

Pull L / R Fire Handle. SOV electrically closed via 28v DC

Question 12

Pulling the Engine Fire Handle will shut off…

Answer 12

Fuel
Hydraulic Pressure
Engine Generator (IDG)

Question 13

L / R Hydraulic system reservoir full quantities

Answer 13

L = 4.8 gal
R = 1.6 gal
+0.2 if not pressurized

Question 14

What is lost if you lose the LEFT HYD system

Answer 14

Left Thrust Reverser

Question 15

If no other means of pressurizing the LEFT HYD sys (L pump and PTU inop), the AUX pump can provide hydraulic pressure to operate…

Answer 15

Flaps
Ground Spoiler Ctrl
Brakes
NWS
Main Door

Question 16

Flows and Pressures

Answer 16

Main Hyd pumps = 18-28 GPM
PTU = 22.5 GPM
Aux = 2 GPM @ 3000 PSI

Question 17

With an Engine Shutdown and the Fire Handle IN, what airspeed is sufficient to operate the flight controls?

Answer 17

25-35% HP RPM

Question 18

Left and Right System Gal Capacities?

Answer 18

Left = 20.6 gal
Right = 7