Hydraulics

Question 1

How many hydraulic systems are there?

Answer 1

3

Question 2

During normal conditions, how many hydraulic systems are usually operating?

Answer 2

2

Question 3

How is the hydraulic fluid, used for lubrication and cooling of the pumps, cooled?

Answer 3

passes through a heat exchanger in fuel tank before returning to the reservoir.

Question 4

How many pumps are there in each hydraulic system?

Answer 4

2

Question 5

If there is an overheat detected in hydraulic system A or B, does the electric pump continue to operate?

Answer 5

No

Question 6

Is there any effect on the flight controls with loss of hydraulic system A or B?

Answer 6

No

Question 7

What is the difference between a Hydraulic A Engine Driven Pump leak/related lines
and an ELEC pump leak/related lines?

Answer 7

If a leak develops in the electric motor–driven pump or its related lines, or components common to both the engine and electric motor–driven pumps, the quantity in the reservoir steadily decreases to zero and all system pressure is lost.

Question 8

What still operates when Hydraulic System B Engine Driven Pump volume is lost?

Answer 8

Power transfer unit

Question 9

What is the function of the PTU?

Answer 9

The purpose of the PTU is to supply the additional volume of hydraulic fluid needed to operate the autoslats and leading edge flaps and slats at the normal rate when system B engine–driven hydraulic pump volume is lost.

Question 10

When does the Standby Hydraulic System automatically activate?

Answer 10

• loss of system A or B,
• flaps extended,
• airborne, or wheel speed greater than 60 kts,
• FLT CONTROL switch A or B Hydraulic System ON

Or the main PCU Force Fight Monitor (FFM) trips

Question 11

What does the Standby Hydraulic System power?

Answer 11

• thrust reversers
• rudder
• leading edge flaps and slats (extend only)
• standby yaw damper.

Question 12

When is the Landing Gear Transfer Unit operating?

Answer 12

• airborne
• No. 1 engine RPM drops below a limit value
• landing gear lever is positioned UP
• either main landing gear is not up and locked.

Question 13

How do we manually operate the Standby Hydraulic System?

Answer 13

Positioning either FLT CONTROL switch to STBY RUD

Question 14

If there is a leak in the Standby Hydraulic System, what would you notice about the
quantity in System B?

Answer 14

72%