TM 55-1520-240-23-6
7-98
TEST PITCH, ROLL, YAW, OR THRUST INTEGRATED LOWER CONTROL ACTUATOR
(ILCA) (AVIM) (Continued)
7-98
i.
Set SAS 1 LINK TEST switch (38) to SELF
FDBK and FEEDBACK SELECT switch (32)
to SELF. Record indication on DVM (58).
j.
Set FUNCTION SELECT switch (30) to
CLSD LOOP. SAS 1 NULL METER (60.1)
shall move to left.
k.
Subtract step h reading from step c reading.
Travel shall be 0.62 to 0.74 inch.
NOTE
If travel is not acceptable, and the Test
(RED) authority covers are installed,
replace the No. 1 extensible link.
l.
Check readings from steps b and j. Readings
shall be 1.50 to 1.91 volts.
NOTE
If self feedback LVDT is replaced,
insure that Tests 2, 3, 4, and 5 were
performed.
m.
Check readings from steps e and g. Readings
shall be 0.75 to 0.96 volt.
NOTE
Insure that Tests 2, 3, 4, and 5 were
performed. If they were, replace the
self feedback LVDT.
If both travel and voltages are
incorrect, replace the servomotor
assembly or extensible link.
114.
Set SAS 1 VALVE CONTROL (34) to NULL.
115.
Set SAS PRESS SYS 1 valve (3) to OFF.
116.
Set electrical unit switches as follows:
a.
SYSTEM SELECT switch (43) to SAS 2.
b.
SAS 2 FUNCTION SELECT switch (31) to
CLSD LOOP.
c.
SAS 2 LINK TEST switch (39) to SELF FDBK.
d.
SAS 2 FEEDBACK SELECT switch (33) to
SELF.
e.
SAS 2 VALVE CONTROL (35) to NULL.
f.
SAS 2 SQ WAVE control (37) to MIN.
117.
Set SAS PRESS SYS 2 valve (4) to PRESS.
7-432
Change 1
