TM 55-1520-240-23-6
7-97
EXTENSIBLE LINK ACTUATOR CYLINDER FUNCTIONAL TEST (AVIM)
(Continued)
7-97
123.
Check piston (9) seal for leaks. There shall be no
more than 1 drop in 1 minute and 40 seconds.
124.
Set electrical and hydraulic unit controls as
follows:
a.
HIGH PRESS REGULATOR valve (49) to
DECREASE.
b.
HIGH PRESS SHUTOFF valve (48) to
CLOSE.
c.
SOLENOID SHUTOFF switch (35) to
CLOSED.
d.
SOLENOID valve (50) to CLOSED.
e.
AFCS PRESS SYS 1 valve (44) to VENT.
f.
Push and hold HIGH PRESS RELIEF valve
(53) and LOW HIGH PRESS RELIEF valve
(54) for 15 seconds.
g.
AFCS PRESS SYS 1 valve (44) to OFF.
h.
RETURN SYS 1 valve (42) to OFF.
125.
Set electrical unit controls as follows:
a.
FUNCTION SELECT switch (21) to CLSD
LOOP.
b.
SQ WAVE control (27) to MIN.
c.
LINK TEST switch (29) to VALVE.
126.
If no further testing is required, perform normal
shutdown (TM 55-4920-428-13).
END OF EXTERNAL LEAKAGE TEST
7-398