How is the hydraulic

pressure supplied?

a) Engine driven pump on each engine

b) Electrical auxiliary pump

when engine not running

How much pressure

do the pumps provide?

3000 PSI

Where is the hydraulic

reservoir located?

Tailcone

Why does the reservoir

keep fluid under pressure?

To prevent cavitation

What is the main

accumulator for?

Dampens pressure spikes during

high flow demands

What is the NWS

accumulator for?

Provides backup pressure

when main DC is lost

How many cubic inches

of fluid is the reservoir

serviced with?

340 cu inches

What is the auxiliary pump for?

Primarily to set the parking

brakes with engines off

or help maintaining pressure to hyd reservoir

Can you use the aux

pump in flight?

Prohibited

What is the unload position

on the engine switch panel?

Used during engine start airborne

What is the function of

the unload switch?

Open the hyd pump unload valve,

and relieve pump pressure

What message do you get when pressing the unload switch?

Hydraulic pressure low L-R will appear

when pump pressure drops below 2200 PSI

What happens to the hydraulic system with one pump inop?

System still operate normally

with one pump only

What are the 3 gauges you inspect

in the left nose

compartment on preflight?

From top to bottom:

Brake pneumatic bottle

NWS accumulator

Gear blow down bottle

What prevents the TR's

to deploy in flight?

Isolation valves block hydraulic

pressure to the unlock mechanism

What light and message do

you see if the TR's

are armed in flight?

a) Arm will display above N1 tapes

b) T/R armed L-R

What lights and message do

you see if the TR's are

unlocked in flight?

a) Unlk above N1 tapes

b) T/R unlock L-R

What lights and messages do

you see if the TR's

are deployed in flight?

a) dply above N1 tapes

b) T/R armed L-R message

c) T/R unlock L-R message

d) Engine control fault L-R message

e) Emer stow switches flashes

What is the memory item

for a TR's deployment?

1) Press affected stow emer

2)  Affected throttle idle

3) Slow to 150 Kts max

How does emer stow work?

Open the isolation valve

Provide pressure to the actuators

to keep the door stowed

What lights and message

do you see once you

press emer stow?

a) White "arm" above N1 tapes

b) T/R armed L-R

What does a closed

center hydraulic system mean?

Keep constant pressure to

provide flow on demand

What system become inop

when you lose hydraulic system?

a) Spoilers

b) Gear

c) Speedbrakes

d) T/R's

e) NWS

f) Brakes

How is the hydraulic volume

gauge powered on the ground service panel?

Main DC

Since preflight is done with batteries off,

check the EICAS instead

At what PSI do you

set the brakes?

2400 PSI

What powers the aux pump?

 Main DC

What does hyd PSI

measure on the EICAS?

System pressure only, not an

output of the pump

What does hydraulic

pressure high mean?

3400 PSI for longer than 10 seconds

(pump doing too much)

Why the 10 Kts limitation during X-wind with no hydraulic fluid?

No more roll spoilers

With no hydraulic, why landing distance multiplied by 1.63?

No brakes

No anti-skid

No speedbrakes

Why will you not have

anti-skid with no hydraulic?

Because you will have to use

emergency braking, which does not

have anti-skid function

What do the TR's

require to open

on the ground?

a) 3 squat switches

b) Throttles at idle

Max reverse thrust N1

70 %

At what speed does the TR's

must be at idle?

65 Kts

How are the TR's

held down?

4 locks

2 on top, 2 at bottom

When do the TR's

need to be checked?

a) 1st flight of the day

b) Flight predicated on use of

T/R's for performance

c) Maintenance

What does arm light mean?

 Pressure available to TR's

What does unlock

light mean?

At least 1 of 4 locks is unlock

How do you get an arm

light in flight?

a) TR's lever up

b) Emer stow pressed

What is the memory item

for a brake failure

on the ground?

a) Feet off the pedals

b) Pull and hold the emergency brake

handle until stopped

What happens to the

rudder bias when the

TR's unlock light illuminate?

Move to its minimum position

Why do you get eng control fault message when the TR's

are deployed in flight?

No cable to throttle

FADEC sets a miscompare between

its position and the engine

automatically set at idle

What is the sequence of

valves for the TR's

to be opened?

Pressure/isolation valve/control valve/

unlock or deploy

"PIC"

What happens to the

speedbrakes if you

lose hydraulic?

a) If retracted, they will not extend

b) If extended, they will blow to trailing position

Why is it prohibited to use

the aux pump in flight?

Cooling issues

What is the purpose

of the isolation valve

with TR's?

Allows hydraulic pressure

to reach the control valve

How is the isolation

valve powered?

Main DC

What is the purpose of the control valve with the TR's?

Directs hydraulic fluid to the deploy

or stow side of the actuators

How is the control

valve powered?

Main DC

What happens when

pressing the emer stow?

a) Opens the isolation valves

b) Directs the control valve

to the stow position

Why does it take longer for the gear

to come down using the blowdown

Vs normal operation?

Normal operation uses 3000 PSI hydraulic pressure

Blowdown uses only 1800 PSI, explaining the amount of time

List the hydraulic subsystems:

B-G-N-S-T

Brakes, Gear, NWS, Speedbrakes, TR's

True or false: both hydraulic pumps

are required to meet total system demand

False

All hydraulic is lost.

What type of braking is available?

Pneumatic without anti-skid