HYD

Question 1

The utility system supplies hydraulic power to…

Answer 1

Flaps
Main Landing Gear
Nose Landing Gear
Normal Brakes
Nosewheel Steering
1/2 FlightControl Boost System
AR Hoses

Question 2

The booster system supplies…

Answer 2

1/2 Flight Control Boost System

Question 3

The auxiliary system supplies….

Answer 3

Cargo Door and Ramp
Emergency Brake 
Emergency Nose Gear Extension
Emergency AR Hose Operation
Ground Tie in to Utility System

Question 4

Where is the utility reservoir located and how much does it hold?

Answer 4

left side of cargo compartment

5.5 gallons

Question 5

Where is the ground test valve located?

Answer 5

left aft wheelwell fairing

Question 6

How many filters are in the utility system?

Answer 6

four

Question 7

Which bus powers the suctions boost pumps (booster and utility)?

Answer 7

Essential AC

Question 8

How many filters are in the booster system?

Answer 8

4

Question 9

Where is the booster reservoir and how much does it hold?

Answer 9

right side of cargo compartment

3.1 gallons

Question 10

What operates the auxiliary system?

Answer 10

3 phase ac electrically driven hyd pump

Question 11

Which bus powers the aux system’s electric diven pump?

Answer 11

Main AC

Question 12

Where is the Aux system located

Answer 12

Aft left cargo compartment

Question 13

How many filters are in the aux system?

Answer 13

2

Question 14

How much fluid does the aux reservoir hold?

Answer 14

5.3 gallons

Question 15

Hyd Sys Pressure (Utility/Booster)

Red=
Yellow=
White=

Answer 15

Red=0-2450psi or>3510psi

Yellow=2550-2890psi or 3210-3500psi

White 2900-3200psi

Normal pressure based on 100% NP, flight controls neutral, suctions boost pumps ON, and nos sys. actuation.

LSGI may produce pressure as low as 2550 and is acceptable provided normal limits are met with the above conditions.

Question 16

Rudder Boost Pressure

Red=
Yellow=
White=

Answer 16

Red= 0-2540 or >=3510 (15-100% flaps)
0-1090 or >=1610 psi (0-15% flaps)

Yellow= 2550-2890 or 3210-3500 (15-100% flaps)
1440-1600psi (0-15% flaps)

White=2900-3200 (15-100%)
1100-1390 psi (0-15%)

Question 17

Aux Hyd Sys Pressure

Red=
Yellow=
White=

Answer 17

Red= 0-2240 or >=3510 psi

Yellow= 2250-2750 or 3210-3500

White= 2760-3200psi

Question 18

Hydraulic Accumlator Preload
Utility
Booster
Normal Brake
Emergency Brake
Aerial Refueling Hyd

Answer 18

Utility=1500 (+/-100psi)
Booster=1500 (+/-100psi)
Normal Brake =1500 (+/-100psi)
Emergency Brake=1000 (+/-100psi)
AR Hyd = 1350 (+/-50psi)

Question 19

Normal Brake Pressure

Red
Yellow
White

Answer 19

Red=0-2240 or >=3510 psi

Yellow=2250-2890 or 3210-3500psi

White= 2900-3200

2250psi min for one brake application with normal brakes and anti skid OFF

Question 20

Emergency Brake Pressure

Red
Yellow
White

Answer 20

Red= 0-2240 or >=3510

Yellow= 2250-2890 or 3310-3500

White= 2900-3300

2900 psi min for one application of emergency brakes

Question 21

HYD SYS PRESSURE LO/LOSS/LEAK

Answer 21

A. ENGINE PUMPS (affected system)…..OFF (PM)

B. SUCTION BOOST PUMP switch (affected system)……OFF (PM)

Question 22

Do you shut off hydraulic engine pumps for excessive hydraulic system pressure?

Answer 22

No, because the pressure line between the hyd pump and shutoff valve is isolated from its means of pressure control. Excessive pressure will build until the pump or line ruptures dumping the fluid into the engine nacelle.

Question 23

When do you get AUX HYD PMP PRESS LO Caution?

Answer 23

When Aux pump is on and output pressure is less than 1000psi

Question 24

When do you get HYD PMP (#) PRESS LO Caution?

Answer 24

When engine driven pump output pressure < 1000psi and NP above 70%

Question 25

What pressure triggers UTIL SUCT PMP PRESS LO Caution?

Answer 25

<20psi