Hydraulics

Question 1

Type of fluid and pressure amount?

Answer 1

Skydrol hydraulic fluid and 3,000 psig

Question 2

Main components of hydraulic system

Answer 2

Two engine driven pumps
Four electric hydraulic pumps
One hydraulic power transfer unit
Three hydraulic system reservoirs

Question 3

What powers systems one and two?

Answer 3

An engine driven pump

Backed up by an AC electrical pump

Question 4

What powers hydraulic system during take off and landing?

Answer 4

Electric pumps used in case of engine failure.

Question 5

Purpose of power transfer unit?

Answer 5

Transfers power from system one to system two for landing gear retraction and extension if engine pump two is not operational.

Question 6

What powers system three?

Answer 6

Main electric pump and backed up by auxiliary pump as a back up.

Question 7

When is PTU not operational?…… Power transfer unit.

Answer 7

It will not be activated when on the ground and airspeed below 50 knots.

Question 8

Items on system one?

Answer 8

Left outboard elevator
Upper rudder
Engine one reverser 
Multi function spoilers three and four
Ground spoiler two
Outboard brakes
EMER/parking brake

Question 9

Items on system two

Answer 9

Landing gear
Inboard elevator 
Aileron inboard
Reverser two
Multi function spoiler 5
Ground spoiler one
Inboard brakes
Nose wheel steering
EMER/parking brake

Question 10

Items on system three

Answer 10

Right outboard elevator
Lower rudder
Outboard ailerons

Question 11

When do the electric pumps on system one and two come on automatically?

Answer 11

During take off and landing or when primary engine driven pump is lost.

Question 12

When does three B operate automatically?

Answer 12

Only when three A is lost and does not come on during take off or landing.

Question 13

What is the primary pump on system three?

Answer 13

A….. It is always on that is why does not have auto position.

Question 14

What activates the PTU?

Answer 14

If engine two fails or system two fails during take off or landing when PTU knob is in auto and flaps are not set at zero.

Question 15

Reason for on position for hydraulic pump switches?

Answer 15

If a failure of corresponding SPDA allows to set to on for use.

Question 16

When do electric pumps one and two auto turn on?

Answer 16

When flaps are set to any position greater than zero degrees.
Trust levers set to take off thrust
Or ground speed greater than fifty knots
Or when engine driven pumps are not operational

Question 17

Overheat of system one or two

Answer 17

Caution message at 100 c and auto shutoff at 125
145 gives warning… If three overheats then both pumps shut off at 125

This can be caused by the failure of a pump compensator

Question 18

Hydraulic items on RAT

Answer 18

Lower rudder
R outboard elevator
Left and right outboard ailerons

Question 19

Purpose of the system accumulator

Answer 19

Control flight controls until RAT is deployed and spun up if both one and two are off line.

Question 20

How does system allow for single engine taxi?

Answer 20

With engine one running, releasing the parking brake with switches in auto electric pump two is automatically turned on allowing for nose wheel steering and inboard brakes.

Question 21

Items on hydraulics

Answer 21

Primary and secondary flight controls
Landing gear
Brakes
Nose wheel steering
Thrust reversers