TM 55-1520-240-23-6
7-98
TEST PITCH, ROLL, YAW, OR THRUST INTEGRATED LOWER CONTROL ACTUATOR
(ILCA) (AVIM) (Continued)
7-98
TEST 21
STABILITY TEST
389.
Perform steps 1 thru 40.
390.
POWER switch (28) to ON.
391.
Set LINK TEST switch (29) to SELF FDBK.
392.
Set FUNCTION SELECT switch (21) to
BALANCE.
393.
Install dial indicator (3) on post (57). Position
anvil of indicator against piston (9).
394.
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.
SAS PRESS SYS 1 valve (44) to PRESS.
f.
Slowly turn HIGH PRESS REGULATOR
valve (49) toward INCREASE until HIGH
PRESS gauge (51) indicates 1500 psi.
g.
Slowly turn HIGH PRESS SHUTOFF valve
(48) to OPEN.
395.
Set FUNCTION SELECT switch (21) to HARD
OVER RETRACT then BALANCE.
396.
Adjust dial indicator (3) for a reading of 1 inch.
Set FUNCTION SELECT switch (21) to HARD
OVER RETRACT then BALANCE.
NOTE
An overshoot of 0.002 to 0.005 inch
is allowed on indicator, but piston
must stop within 1 second.
397.
Check dial indicator (3) for piston (9) movement.
There shall be no movement and indicator shall
indicate 1 inch.
398.
Set FUNCTION SELECT switch (21) to HARD
OVER EXTEND then BALANCE.
399.
Adjust dial indicator (3) for a reading of 1 inch.
Set the FUNCTION SELECT switch (21) to
HARD OVER EXTEND then BALANCE.
400.
Check dial indicator (3) for piston (9) movement.
There shall be no movement and indicator shall
indicate 1 inch.
Change 1
4-472.3
