Falcon 20 Retrofit Hydraulics

Question 1

What is normal hydraulic pressure?

Answer 1

3000 psi

Question 2

What is the capacity of each hydraulic tank?

Answer 2

The left (#1) tank holds 4 gallons.  
The right (#2) tank holds 4.3 gallons

Question 3

What is the capacity of the reserve section of each hydraulic tank?

Answer 3

1.5 gallons

Question 4

How many sources of pressure are in the Falcon 20?

Answer 4

1. Hydraulic System #1
2. Hydraulic System #2
3. Standby System
4. Transfer Jack

Question 5

What systems are powered by the hydraulic # 1 side?

Answer 5

1. Landing Gear
2. Air Brakes
3. Nose wheel steering
4. DLE and Slats
5. Flaps
6. Anti skid (normal brakes)
7. Flight Controls

Question 6

What systems are powered by the hydraulic # 2 side?

Answer 6

1. Parking Brake
2. Brakes (emergency brakes)
3. Yaw Damper
4. Flight Controls
5. Arthur Q unit
6. Gear (Emergency Gear Extension)
7. Thrust reverser if installed

Question 7

How is the standby pump tested?

Answer 7

Left to the first detent. Pump will run. Red arrow goes out at 1500 psi, check to see if pressure holds when pump shuts off. Left to second detent, powers all of the systems, pump will now cycle between 1600 and 2150 psi.

Question 8

What is powered with the standby pump on the hydraulic #1 side.

Answer 8

All hydraulic systems

Question 9

What does the standby hydraulic pump #2 power?

Answer 9

Flight Controls and yaw damper

Question 10

Why does the standby hydraulic pump cycle between 1600 and 2150 psi?

Answer 10

Because of the flight controls

Question 11

What hydraulic systems are powered by the transfer jack?

Answer 11

1. Flaps
2. Landing Gear
3. Air brakes
4. Normal brakes
   However, the transfer jack is basically an accumulator so it is gives only limited pressure to these systems. For example, it has enough pressure for only one normal gear extension or retraction.

Question 12

What would cause HYDR 1 or HYDR 2 light to come on?

Answer 12

Pressure in the system goes below 2150 psi

Question 13

If hydraulic system #1 is no longer supplying pressure and the standby pump is selected fully to the left why will the HYDR 1 light flash periodically?

Answer 13

When the standby pump reaches 2150 psi it will satisfy the pressure switch for the light, but when the flight controls are used the pressure will fall below 2150 which will turn the HYDR 1 light back on momentarily.

Question 14

What makes the red HYDR 1 and HYDR 2 lights illuminate?

Answer 14

Less than 1500 psi in the flight controls

Question 15

What is the pressure of the hydraulic reservoir?

How is is pressurized?

Answer 15

21 psi

Bleed Air

Question 16

What would cause the red “jewel” light to illuminate on the hydraulic panel between the gage scales?

Answer 16

Less than 16 psi head pressure in the tank. It is then necessary to descend below FL 200.

Question 17

Is takeoff authorized with the hydraulic panel jewel light on?

Answer 17

No.

Question 18

What limitations are there to using only manual controls in flight?

Answer 18

Must slow to 200 knots

Question 19

Which hydraulic fluid reservoir does the standby pump use?

Answer 19

Only the 1.5 gallon reserve supply in the hydraulic reservoirs.

Question 20

What causes the Red boxes marked with a 1 and 2 to illuminate on the hydraulic panel?

Answer 20

Servo pressure (flight controls) is less than 1500 psi

Question 21

What causes the transfer jack light to turn on.

Answer 21

Normally, the transfer jack is always fully charged. Any movement of the TJ piston away from the fully charged position will illuminate the light.

Question 22

Will the TRANS JACK amber light illuminate under normal operating conditions?

Answer 22

Yes, it may blink on and off during landing gear operation, but should extinguish when gear operation is complete.