Hydraulic

Question 1

All three hydraulic systems use ______ hydraulic fluid and operate at a nominal pressure of _____ psig

Answer 1

Skydrol hydraulic fluid at 3,000 psig

Question 2

There are ____ engine driven hydraulic pumps, _____ electric hydraulic pumps, ____ power transfer unit, and ____ hydraulic reservoirs

Answer 2

There are 2 engine driven hydraulic pumps, 4 electric hydraulic pumps, 1 power transfer unit, and 3 hydraulic reservoirs

Question 3

Hydraulic systems ___ and ___ are driven by an engine driven pump and backed up by ____

Answer 3

1 and 2

Backed up by an AC electrical pump

Question 4

(T/F) The power transfer unit will not be activated if on the ground and below 50 kts

Answer 4

True

Question 5

The PTU transfers hydraulic power between systems ___ and ___ to help operate the landing gear. When the PTU is activated it _____ (does/doesn’t) mix fluid between the two systems.

Answer 5

Transfers power between 1 and 2 and doesn’t mix fluid

Question 6

Hydraulic system 1 provides power to the: (7)

Answer 6

• Left hand outboard elevator
• Upper rudder surface
• Engine 1 thrust reverse
• Multi-function spoilers pair 3/4
• Ground spoiler 2
• Outboard brakes
• Emergency parking brake

Question 7

Hydraulic system 2 provides power to the: (9)

Answer 7

• Inboard elevator PCU
• Inboard aileron PCU
• Engine 2 thrust reverse
• Multi-function spoilers pair 5
• Ground spoiler 1
• Inboard brakes
• Nose wheel steering
• Emergency parking brake
• Landing gear

Question 8

Hydraulic system 3 provides power to the: (3)

Answer 8

• Right outboard elevator PCU
• Lower rudder PCU
• Outboard aileron PCU

Question 9

Hydraulic system 1 and 2 electric pumps turn on automatically when:

Answer 9

During takeoff. Flaps must be set >0. T/O thrust set or GS >50 kts.
When the engine driven pump fails

Note: The pumps will be active for at least 60 seconds and will switch off with flap retraction

Question 10

Hydraulic system 3B pump activates when:

Answer 10

Hydraulic pump 3A fails

Question 11

There is no automatic logic with hydraulic pump ____. It is either ON or OFF

Answer 11

3A pump

Question 12

HYD X HI TEMP on EICAS means what?

HYD X OVERHEAT on EICAS means what?

Answer 12

Hydraulic fluid temp is 100 C or greater

Hydraulic fluid temp is 145 C or greater

Question 13

If the hydraulic fluid temperature reaches ____ C the SOV will automatically close for what systems?

Answer 13

125 C

Systems 1 and 2

Question 14

If the hydraulic fluid reaches ____ C on system 3 what happens?

Answer 14

125 C. Both pumps turn off automatically

Question 15

HYD PUMP NOT AUTO in ____ on EICAS means what?

Answer 15

Blue. A hydraulic switch is not properly set for TO