TM 55-1520-240-23-7
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TEST TRANSMISSION OIL PRESSURE SELECTOR SWITCH OR INDICATOR
(AVIM)
(Continued)
8-58
FAIL SAFE CIRCUIT TEST (OPEN)
46.
Set selector switch knob (3) to SCAN.
47.
Adjust variable resistors (11, 12, 13, 14, and 15)
to 100 percent (full counterclockwise).
48.
Adjust variable resistors (11, 12, 13, 14, and
15) five turns clockwise. Check indicator (5).
Indicator shall read 50 psi.
49.
Set FWD test switch (6) to OPEN. Check
indicator (5). Pointer of indicator shall move to 0
psi. Set FWD test switch to NORMAL. Pointer of
indicator shall return to 50 psi.
50.
Repeat step 49 at AFT test switch (7), MIX test
switch (8), LEFT test switch (9), and RIGHT test
switch (10).
FAIL SAFE CIRCUIT TEST (SHORT)
51.
Set selector switch knob (3) to FWD. Set FWD
test switch (6) to SHORT. Check indicator (5).
Pointer of indicator shall move to 100 psi. Set
FWD test switch to NORMAL. Pointer of indicator
shall return to 50 psi.
52.
Repeat step 51 with selector switch (2) at AFT,
MIX, LEFT, and RIGHT dial position, for AFT test
switch (7), MIX test switch (8), LEFT test switch
(9), and RIGHT test switch (10), respectively.
SHUTDOWN
53.
Remove power from test setup.
54.
Remove indicator (5) and selector switch (2) from
test setup.
FOLLOW-ON MAINTENANCE:
None
END OF TASK
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