Hydraulics

Question 0

How is hydraulic quantity displayed on the status display?

Answer 0

In percentages (1.0 is full)

Question 1

How many hydraulic systems are there ?

Answer 1

3

Question 2

How can you tell if hydraulic needs refilling ?

Answer 2

Numbers turn amber on status & RSVR light on overhead panel illuminates

Question 3

What does RSVR light on hydraulic overhead panel mean?

Answer 3

Low quantity or pressure

Question 4

Does the 757 have demand pumps (hydraulic)?

Answer 4

No only 767

Question 5

What does the air driven hydraulic pump on the 767 supplement ?

Answer 5

Gear and flaps hydraulics

Question 6

When do command pumps come on?

Answer 6

When primary pump pressures are low - center ADP - when high load items selected (gear & flaps)

Question 7

What does the reserve brakes & steering do on the 767?

Answer 7

Isolates the center #1 electric pump to provide hydraulic press to the reserve brakes & steering system if system quantity is low

Question 8

Whats the main difference between 757 200 & 757 ER HYDRAULIC system?

Answer 8

ER has HDG

Question 9

What hydraulic system is the HDG on (757 ER). How does the HDG work if you lose that hydraulic system?

Answer 9

1. PTU supplies HDG through system 3 if #1 fails

Question 10

What system is the HDG on in the 767 ? What comes on automatically if HDG comes on?

Answer 10

Center - ADP operates continuously if HDG operating

Question 11

Which demand pump is inhibited during engine start on the ground (767)

Answer 11

Left

Question 12

How is the hydraulic reservoir pressurized?

Answer 12

Bleed air system

Question 13

What does RF display on the status page mean?

Answer 13

Hydraulic reservoir needs refilling

Question 14

What does pulling the fire switch do to the hydraulic system?

Answer 14

Shuts off fluid to the engine driven pump & depressurizes the pump

Question 15

What is the critical system on the 767? 757?

What are some of the important items?

Answer 15

767- CENTER

757 - LEFT

Nose wheel steering, alt brakes, landing gear, HDG.

Question 16

What is the reserve hydraulic fluid used for on the 757?

Answer 16

For use of the PTU in case of LEFT system hydraulic leak

Question 17

What does the PTU do on the 757 - when does it activate?

When is PTU inhibited?

Answer 17

Transfers power from the RIGHT to LEFT system if L engine fails or L engine driven pump pressure is low (supplements L elec motor pump)

PTU is inhibited if right engine not operating

Question 18

When does the RAT automatically deploy?

What does it power?

Answer 18

RAT deploys automatically when both engines fail.

It powers the flight control portion of the center hydraulic system