Hydraulics

Question 1

Where can you monitor hydraulic quantity and pressure?

Answer 1

STATUS page or Hydraulic Synoptic Display

Question 2

Which hydraulic systems or systems normally power the Primary flight controls?

Answer 2

All three

Question 3

Which hydraulic systems or systems normally power the Normal brakes?

Answer 3

Right

Question 4

Which hydraulic systems or systems normally power the Alternate brakes?

Answer 4

Centre

Question 5

Which hydraulic systems or systems normally power the Reserve brakes?

Answer 5

Centre

Question 6

Which hydraulic systems or systems normally power the Steering?

Answer 6

Centre

Question 7

Which hydraulic systems or systems normally power the Landing gear?

Answer 7

Centre

Question 8

When would the shut-off valves supplying fluid from the Left and Right reservoirs to the engine driven pumps be closed and the engine driven pumps depressurised?

Answer 8

When the appropriate Engine Fire Switch is pulled

Question 9

State the hydraulic systems that have the engine driven pumps as their primary power

Answer 9

Left and Right

Question 10

State the hydraulic systems that have the electrically driven pumps as their primary power

Answer 10

Centre

Question 11

State the hydraulic systems that have the air driven pumps as their primary power

Answer 11

None

Question 12

Which demand pumps are air driven?

Answer 12

Those in the Centre system

Question 13

Before engine start which pump is selected first, and why?

Answer 13

Pressurise the Right System first to prevent fluid transfer between systems. Right ELECTRIC DEMAND pump selector - AUTO, verify that FAULT light is extinguished

Question 14

After engine start, under what circumstances would you expect the demand pumps to run for the Left and Right systems?

Answer 14

In AUTO position, the L and R demand pumps operate for takeoff, landing, and when system or primary pump pressure is low. In the ON position the demand pump runs continuously

Question 15

After engine start, under what circumstances would you expect the demand pumps to run for the Centre system?

Answer 15

In AUTO position, a demand pump operates when system and/or primary pump pressure is low, or when system login anticipates a large demand. In the ON position, the demand pump runs continuously (both pumps cannot operate simultaneously when ON is selected for both pumps)

Question 16

What happens if BOTH Centre system demand pumps are selected to ON?

Answer 16

Only the C1 Demand Pump will operate

Question 17

Why does the Centre hydraulic system have an isolation feature?

Answer 17

To ensure that, in the event of a leak, sufficient fluid is retained for Reserve Brakes, and also for Nose Gear actuation and steering

Question 18

What three conditions could open the left (on the synoptic) isolation valve after the Centre system hydraulic quantity falls to a low value?

Answer 18

Airspeed decreases below 60 knots, or hydraulic pressure to the centre system flight controls is low, or the landing gear is selected down, both engines are normal and both engine-driven pumps are providing pressure

Question 19

When would the Ram Air Turbine (RAT) deploy automatically?

Answer 19

1. Both engines have failed and centre system pressure is low
2. Both AC transfer busses are unpowered
3. All three hydraulic system pressures are low

Question 20

What systems does the RAT provide hydraulic power to?

Answer 20

Primary flight controls connected to the centre hydraulic system