ORAL* E145 Hydraulics

Question 1

How many Pumps in each systemM/

Answer 1

2…one engine driven and one electric

Question 2

Difference between HYD 1 and HYD 2

Answer 2

HYD 1 has a priority valve

Question 3

HYD 1 systems

Answer 3

Ailerons, Rudder, Gear, Main Door, Steering, outboard brakes, Reverser 1, Inboard spoilers

Question 4

HYD 2 systems

Answer 4

Ailerons, inboard brakes, Reverse 2, Emergency Brake, Outboard Spoilers

Question 5

What pressurizes the hydraulic reservoir

Answer 5

Fluid drained from the pressure line

Question 6

How can hyd. shutoff valves close?

Answer 6

Pull fire handle, or with button on overhead panel

Question 7

Pressure from Engine Driven pumps?

Answer 7

3000 psi at 9.8 gallons per minute

Question 8

Pressure from Electric Pumps?

Answer 8

2900 at .7 gallons per minute

Question 9

In AUTO, when do electric pumps turn on

Answer 9

pressure below 1600 psi or associated engine n2 < 56.4%

Question 10

What does priority valve on HYD 1 do?

Answer 10

If Engine Pump has failed, it gives priority to Flight controls instead of landing gear. Landing gear will extend with accumulator pressure in this case

Question 11

How many accumulators each side?

Answer 11

1

Question 12

What does accumulator in system 1 do?

Answer 12

Reduce surges and keep 3000 psi for landing gear ops

Question 13

What does accumulator in system 2 do?

Answer 13

Reduce surges and keep 3000 psi for emergency/parking brake

Question 14

When does priority valve begin to close?

Answer 14

< 2600 psi in HYD 1

Question 15

HYD Overheat temp?

Answer 15

90 C

Question 16

HYD low quantity message?

Answer 16

< 1 liter

Question 17

MFD…Hydraulic pressure caution and BOXED?

Answer 17

Below 1300 psi

Question 18

Normal fluid levels?

Answer 18

4.5-5.5 liters