TM 55-1520-240-23-6
7-97
EXTENSIBLE LINK ACTUATOR CYLINDER FUNCTIONAL TEST (AVIM)
(Continued)
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TEST 4
STABILITY TEST
66.
Perform steps 1 thru 35. Check initial control and
valve settings in steps 20 and 21.
67.
SET LINK TEST switch (29) to SELF FDBK.
68.
Set FUNCTION SELECT switch (21) to
BALANCE.
69.
Install dial indicator (3) on post (57). Position
anvil of indicator against piston (9). Adjust
indicator to 1 inch.
70.
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) toward INCREASE until HIGH
PRESS gage (51) indicates 1500 psi.
g.
Slowly turn HIGH PRESS SHUTOFF valve
(48) to OPEN.
71.
Set FUNCTION SELECT switch (21) to HARD
OVER RETRACT then BALANCE. Check dial
indicator (3) for piston (9) movement. There shall
be no movement and indicator shall indicate 1
inch. An overshoot of 0.002 to 0.005 inch is
allowed, but piston shall stop within 1 second.
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