Hydraulic System

Question 1

How many hydraulic systems are there/

Answer 1

3, L R C

Question 2

How many pumps on L R C systems?

Answer 2

2 on each. L and R have one engine and one electric. C has two electric pumps

Question 3

PTU connects what two systems?

Answer 3

Transfers hydraulic power from the R to L

Question 4

Which system does the RAT provide pressure to?

Answer 4

C

Question 5

When is the PTU activated?

Answer 5

• left engine fails (<50% N2)
• or the left ENG pump output pressure is low
• and the right egine is operating normally.

Question 6

What does the PTU operate when activated?

Answer 6

• Flaps
• Slats
• Landing Gear
• Nose Wheel Steering

Question 7

When does the RAT deploy?

Answer 7

Loss of L and R engines in flight, RAT auto deploys and provides pressure to C system.

Question 8

What is the RAT deployment circuitry powered by?

Answer 8

Hot Batt bus

Question 9

Can the RAT be deployed manually?

Answer 9

Yes, with Ram Air Turb switch. Caution - It can be deployed manually on the ground.

Question 10

At what speed with the RAT provide adequate hyd pressure?

Answer 10

130 kts

Question 11

The L, R and C systems are pressurized at approximately what PSI

Answer 11

3000 psi

Question 12

Which system operates the Landing gear and nose wheel steering?

Answer 12

L

Question 13

At what reservoir quantity does the RF for refill display?

Answer 13

.75 or 75%. RSVR light illuminates at 50%

Question 14

All System reservoirs have a reserve. In each system, what is the reserve used for?

Answer 14

L - PTU
R- Reserve brakes
C- RAT

Question 15

-300 what provides power to AC busses if power is lost?

Answer 15

the HDG or hydraulic driven gen in L system

Question 16

767 - what differs in the electric pumps and ADP or air driven pump.

Answer 16

Instead of off and on. The pumps are demand pumps. In auto - only kick on if pressure is low in system

Question 17

767- What system controls gear and nose wheel steering?

Answer 17

C

Question 18

767 - Does the RSVR light illuminate for a low air pressure condition?

Answer 18

NO

Question 19

767- what is the PES or pitch enhancement system?

Answer 19

consists of a hydraulic motor in the right system, which powers a pump and uses trapped left trim system fluid to operate the stab. used in an event when L and C hyd systems fail.