TM 55-1520-240-23-6
7-97
EXTENSIBLE LINK ACTUATOR CYLINDER FUNCTIONAL TEST (AVIM)
(Continued)
7-97
TEST 5
PROOF PRESSURE TEST
78.
Perform steps 1 thru 35. Check initial control and
valve settings in steps 20 and 21.
79.
Adjust test stand pressure to 2600 psi.
80.
SET LINK TEST switch (29) to SELF FDBK.
81.
Set electrical and hydraulic unit controls as
follows:
a.
Check RETURN SHUTOFF valve (38) is
OPEN.
b.
SOLENOID valve (50) to OPENED.
c.
SOLENOID SHUTOFF switch (35) to OPEN.
d.
RETURN SYS 1 valve (42) to RETURN.
e.
AFCS PRESS SYS 1 valve (44) to PRESS.
f.
Slowly turn HIGH PRESS REGULATOR
valve (49) towards INCREASE until HIGH
PRESS gage (51) indicates 2250 psi.
g.
Slowly turn HIGH PRESS SHUTOFF valve
(48) to OPEN.
82.
Set FUNCTION SELECT switch (21) to HARD
OVER EXTEND. Hold for 5 minutes. Check for
external leaks. There shall be no leaks.
83.
Set FUNCTION SELECT switch (21) to HARD
OVER RETRACT. Hold for 5 minutes. Check for
external leaks. There shall be no leaks.
84.
Set FUNCTION SELECT switch (21) to CLSD
LOOP.
7-391
