Hydraulics

Question 1

When does the PTU auto come on when armed?

Answer 1

Left Hyd < 1500 psi

Prevents auto op if:
<1 gal in reservoir
R Hyd > 104°C

Question 2

The motor side of the PTU is driven by?

Answer 2

Right Hyd system pressure

Question 3

When ARMED, the AUX pump comes on auto:

Answer 3

Brakes depressed 10° AND
Left Hyd / PTU Press < 1500 psi

Question 4

Brake Accumulator psi pre-charge

Answer 4

1200 psi

Question 5

If the L HYD sys fluid is depleted, but AUX fluid remains, what sys can provide braking?

Answer 5

AUX pump

Question 6

Gear Emergency Blowdown Pre-Charge

Answer 6

3,100 psi

Question 7

How do you turn off the L / R Hyd sys to get (0) hyd pressure?

Answer 7

Pull the fire handle

Question 8

Pulling the engine fire handle out will shut off:

Answer 8

Hydraulic pressure
Fuel
IDG

Question 9

Fluid quantities of the L / R Hyd reservoirs?

Answer 9

Full:
L = 2.8 gal Synoptic (2.75 gal limitations)
R = 0.7 gal Synoptic

Low:
L = 2.2 gal
R = 0.53 gal

Question 10

What is lost if you lose the Left Hydraulics?

Answer 10

Left T/R
YD1

Question 11

If no other means of pressurizing the Left hydraulic system (L HYD pump and PTU inop) is available, the AUX pump can provide hydraulic pressure to operate the following components:

Answer 11

Brakes and Flaps

(+NWS and YD1 in the 550)

Question 12

Can you change the YD from LEFT to the RIGHT? How?

Answer 12

Yes
Disp Controller –> SENSOR btn < Box FCG 2

Question 13

What is lost if you lose Right Hyd Sys pressure?

Answer 13

Right T/R
YD2
PTU

Question 14

With the loss of both hyd systems:

Answer 14

Both YD’s are inop

Question 15

If the PTU shuts off auto for over-temp, can you manually select it on?

Answer 15

Yes. Push “ON” switch

Question 16

How is the auto turn-on feature of the AUX pump checked during PREFLIGHT?

Answer 16

ARM the AUX pump
Depress pedals more than 10°

Question 17

The AUX pump may operate what components?

Answer 17

Flaps
Brakes
Parking Brake pressure
Main Door

Question 18

What Hyd systems can operate the flaps?

Answer 18

Left, PTU, AUX

Question 19

What sys will provide braking with a dual hyd sys failure?

Answer 19

AUX

Question 20

How many DPI’s does the Right Hyd Filter Manifold have? What?

Answer 20

1. Main Pressure Filter DPI
2. Return Pressure Filter DPI
3. Engine Pump Bypass Filter DPI

Can only be reset by a mechanic

Question 21

How many DPI’s does the Left Hyd Filter Manifold have? What?

Answer 21

1. Main Pressure Filter DPI
2. Return Pressure Filter DPI
3. Engine Pump Bypass Filter DPI
4. AUX Return Filter DPI
5. PTU Pump Bypass Filter DPI

Can only be reset by a mechanic

Question 22

How many DPI’s does the 450 have?

Answer 22

10 Total
(5) Left Filter Manifold
(3) Right Filter Manifold
(1) AUX Filter Manifold
(1) PTU Filter Manifold - Only one that may be reset by a pilot (BWI in the 550)