To test an aircraft system, proceed as follows:

TM 55-4920-442-13&P

NOTE

Refer to the technical publication which applies to aircraft being serviced for the proper test

procedures.

c. Set the 4-way valve to the aircraft reservoir position.

d. Set selector valve to LP filter outlet position.

e. Activate the test stand.

f. Open the HP flow control valve.

g. Slowly close the HP bypass.

h. Proceed with the aircraft system test as directed in the technical publication applicable to the aircraft being tested.

i. Observe high pressure gage and adjust the compensator control to obtain the required pressure for the specific

aircraft.

j. Observe the flowmeter and adjust the volume control to obtain the required hydraulic fluid flow for the aircraft

being tested.

k. Monitor the temperature of the hydraulic fluid at the LP filter outlet by observing the oil temperature gage.

l. Occasionally or as necessary check the return pressure from the aircraft by switching the selector valve to the

suction return position and observe low pressure gage.

m. After completing the hydraulic test of the aircraft shut down the test stand using standard operating procedures

n. With the test stand shut down disconnect the test stand from the aircraft and store the hoses.

2-7