767 Hydraulics

Question 1

What does the system pressure light mean?

Answer 1

The System pressure is low.

Question 2

What does the QTY/RSVR light mean?

Answer 2

The reservoir is half full.

Question 3

What do the pump PRESS light mean?

Answer 3

HYD pump pressure is low.

Question 4

What does the OVHT light mean?

Answer 4

HYD pump temperature is high.

Question 5

Which center electric HYD pump is load shed and when?

Answer 5

The # 2 pump is shed with only one power source.

Question 6

When does the ADP HYD pump operate when in the auto position?

Answer 6

It operates with low center system pressure or in anticipation of high demand loads.(ex: gear and flap operation)

Question 7

When do the L/R electric demand pumps operate in the auto position?

Answer 7

When primary system pressure is low.

Question 8

How is each HYD reservoir pressurized?

Answer 8

Its respective Bleed air system.

Question 9

What items are on the Left HYD System?

Answer 9

Aileron
Rudder
Elevator
L Reverser
Rudder Ratio
Stab trim via the PES
Spoilers
Servos

Question 10

What items are on the Center HYD System?

Answer 10

Aileron
Rudder
Elevator
Landing Gear
Flaps and Slats
HDG
Nose Wheel Steering 
Alternate Brakes
Stab Trim
Spoilers
Servos
RAT

Question 11

What items are on the Right HYD System?

Answer 11

Ailerons
Rudder
Elevator
Normal Brakes
Pitch Enhancement System
R Reverser
Spoilers
Servos

Question 12

What HYD system is the normal brake system located?

Answer 12

Right

Question 13

What HYD system is the Alternate brake system located?

Answer 13

Center

Question 14

What hydraulic system is the Reserve brake system located?

Answer 14

Center via the C1 electric pump.

Question 15

Which brake systems have anti-skid?

Answer 15

All, individual skid protection for the normal and accumulator. Paired wheels for alternate and reserve brake systems.

Question 16

What happens to the brake system with a loss of the right HYD system?

Answer 16

The alternate brake system automatically takes over. There is no notice that this has happened.

Question 17

What happens if the alternate brake system now fails?

Answer 17

If the center reservoir drops below standpipe the isolation valves close and the Reserve Brake system via the C1 electric pump.

Question 18

What is the RAT?

Answer 18

Ram Air Turbine - it can power the center flight controls only.

Question 19

When does the RAT arm?

Answer 19

Arms at 80 knots.

Question 20

When does the RAT deploy?

Answer 20

Automatically with a loss of both engines or manually by pressing the switch.

Question 21

When does the HDG operate?

Answer 21

The loss of both main AC busses.

Question 22

What is the PES?

Answer 22

Pitch enhancement system. Provides stab trim backup if both L and C hydraulic systems fail.

Question 23

How does the PES work?

Answer 23

It uses the R HYD system to run a motor that uses trapped L hydraulic system fluid to move the stab trim.

Question 24

How fast does the PES move the stab trim?

Answer 24

1/4 rate

Question 25

How do you actuate the PES?

Answer 25

Electric control column switches(alternate and automatic inop) thus no autopilot trimming.

Question 26

Why is there a a huge penalty with the ADP inop?

Answer 26

Because, with the loss of an engine during take off you can't get the gear and flaps up to maintain the 2.4% climb gradient.

Question 27

When is the ADP inhibited?

Answer 27

With wing anti-ice.

Question 28

What type of power is used for the ADP?

Answer 28

DC power and automatically powered when the HDG is running.

Question 29

Degree of rudder pedal and tiller steering?

Answer 29

rudder-7 degrees, tiller-65 degrees

Question 30

Turn radius of a 767-200 and 767-300?

Answer 30

200-129' and 300-146'

Question 31

How is the L, C, and R hydraulic system fluid cooled?

Answer 31

L system fluid cooled via left fuel system. C & R system fluid cooled via the right fuel system.

Question 32

What is the electric power source for the L & R electric HYD pump?

Answer 32

L- R main AC bus R- L main AC bus So a loss of an engine does not result on a loss of same side electric pump.

Question 33

Which brake system will autobrakes operate?

Answer 33

Normal only. No right HYD system pressure no autobrakes.

Question 34

How is HYD fluid measured?

Answer 34

In percentage.

Question 35

What is the minimum HYD quantity?

Answer 35

No number, only a magenta RF(refill) indicates 75% remaining.