HYDRAULIC PANEL

Question 1

DESCRIBE HYDRAULIC System 1 & 2.

Answer 1

System 1 & 2 are very similar and consist of one engine driven pump and one alternating current motor pump (ACMP).
On – Pump will operate at 3000 psi output +/- 200 psi.
OFF – Pump is off
AUTO – Pump is in automatic/standby mode and will operate when:
The flaps are out of the zero degree position and the opposite side generator is on-line.
System 1 & 2 are cooled be an air/hydraulic oil heat exchanger located in the aft equipment bay. Cooling from the ram air scoop is directed across the heat exchanger to cool the fluid.

Question 2

DESCRIBE HYDRAULIC System 3.

Answer 2

System 3 consists of two ACMPs
ACMP 3A
OFF – Pump off.
ON – Pump will operate at 3000 +/- 200 psi output.
This pump normally runs continuously.
ACMP 3B
OFF – Pump off.
ON – Pump will operate at 3000 +/- 200 psi output.
AUTO - – Pump is in automatic/standby mode
When the ADG is automatically deployed, ACMP 3B is energized regardless of the switch position to maintain hydraulic power to the primary flight controls.

Question 3

WHAT IS THE NORMAL OPERATING PRESSURE OF THE HYDRAULIC SYSTEMS?

Answer 3

3000 PSI +/- 200 PSI

Question 4

ARE THE PUMPS THAT ARE ON THE HYDRAULIC PANEL ELECTRICAL OR ENGINE DRIVEN?

Answer 4

THEY ARE ELECTRICAL, ACMP.

Question 5

WHY DOES THE CROSS SIDE HYDRAULIC PUMP SHUT DOWN WHEN YOU HAVE A GENERATOR FAILURE?

Answer 5

SO THAT THERE IS NOT AN ADDITIONAL ELECTRICAL DRAIN ON THE SYSTEM WHEN YOU LOSE A SOURCE OF POWER.

Question 6

WHAT HYDRAULIC SYSTEM IS POWERED BY THE ADG?

Answer 6

When the ADG is automatically deployed, ACMP 3B is energized regardless of the switch position to maintain hydraulic power to the primary flight controls.

Question 7

HOW MANY SYSTEMS DO YOU LOSE WHEN HYDRAULIC SYSTEM 1 IS LOST?

Answer 7

1 SYSTEM.

Question 8

HOW MANY SYSTEMS DO YOU LOSE WHEN HYDRAULIC SYSTEM 2 IS LOST?

Answer 8

2 SYSTEMS.

Question 9

HOW MANY SYSTEMS DO YOU LOSE WHEN HYDRAULIC SYSTEM 3 IS LOST?

Answer 9

3 SYSTEMS.

Question 10

WHAT HYDRAULIC SYSTEMS ARE COOLED, AND HOW ARE THEY COOLED?

Answer 10

System 1 & 2 are cooled be an air/hydraulic oil heat exchanger located in the aft equipment bay. Cooling from the ram air scoop is directed across the heat exchanger to cool the fluid.