TM 55-1520-240-23-6
7-98
TEST PITCH, ROLL, YAW, OR THRUST INTEGRATED LOWER CONTROL ACTUATOR
(ILCA) (AVIM) (Continued)
7-98
145.
Set SAS 2 FUNCTION SELECT switch (31)
to HARD OVER RETRACT, BALANCE and
HARD OVER EXTEND three times. Check dial
indicator (9) for oscillations at BALANCE. There
shall be no oscillations. An overshoot of 0.002 to
0.005 inch is allowed, but link shall stop within
1 second.
NOTE
If overshoot exceeds 0.005 inch in
step 144 or 145, replace extensible
link. If link oscillates, replace
servomotor or extensible link.
146.
Set electrical unit controls as follows:
a.
SAS 1 FUNCTION SELECT switch (30) to
CLSD LOOP.
b.
SAS 2 FUNCTION SELECT switch (31) to
CLSD LOOP.
147.
Set electrical and hydraulic unit controls as
follows:
a.
HIGH PRESS REGULATOR valve (52) to
DECREASE.
b.
SOLENOID SHUTOFF switch (44) to CLOSE.
c.
SOLENOID valve (53) to CLOSE.
d.
Press and hold HIGH PRESS RELIEF VALVE
(67) and LOW PRESS RELIEF VALVE (68)
until HIGH PRESS gauge (13) indicates 0
psi.
e.
HIGH PRESS SHUTOFF valve (51) to
CLOSE.
f.
ILCA PRESS SYS 1 valve (1), ILCA PRESS
SYS 2 valve (2), SAS PRESS SYS 1 valve
(3), and SAS PRESS SYS 2 valve (4) to
VENT then OFF.
g.
RETURN SYS 1 valve (5) and RETURN SYS
2 valve (6) to OFF.
148.
If not needed for further testing, remove dial
indicator (9).
NOTE
Dial indicator used in Tests 7, 8, 9,
10, and 17.
149.
Remove PIN 3 (73) and bearing (75) from output
arm (74). Remove PIN 2 (69) from input arm
(61) and stow.
150.
If no further testing is required, perform a normal
shutdown (TM 55-4920-428-13).
END EXTENSIBLE LINK STABILITY TEST
Change 1
7-441
