TM 55-1520-240-T
8-9.3 TRANSMISSION OIL PRESSURE INDICATING AND WARNING SYSTEM OPERATIONAL CHECK (Continued)
8-9.3
TASK
RESULT
CHECK TRANSMISSION OIL PRESSURE INDICATING SYSTEM
36.
Close left and right forward work platforms.
37.
Close pylon lower fairing and hinted fairing.
38.
Close aft transmission baffles.
39.
Check that XMSN OIL PRESS circuit
If circuit breaker (1) is open, close it. If it opens
breaker (13) is closed.
again, go to task 8-9.16.
40.
Check that XMSN OIL PRESS switch (14)
If switch (14) is not at SCAN, then set it to SCAN.
is set to SCAN.
41.
Have pilot start engines and stabilize rpm at 100
Indicator (15) should indicate in normal pressure
percent Check XMSN OIL PRESS
range, 20 to 90 psi. If it does not, turn knob MSN
indicator (15). Record Indication.
OIL PRESS switch (14). To FWD, AFT, MIX, LEFT
then RT positions. Note indications, and go to
task 8-9.17.
42.
Set and hold knob on XMSN OIL PRESS
Pointer on indicator(15) shall move to 0. Switch (14)
switch (14) to TEST.
TEST position shall light. If pointer does not move to
0 or TEST position does not Light, replace
switch (14).
43.
Release knob on XMSN OIL PRESS
Knob on switch (14) shall return to SCAN position.
switch (14).
SCAN position shall light. Pointer on indicator (15)
shall move to operating pressure indication. If knob
does not return to SCAN or SCAN position does
not light, replace switch.
44.
Turn knob on XMSN OIL PRESS
Each position on switch (14) shall Light when
switch (14) to FWD, AFT, MIX, LEFT,
selected. Each indicator (15) switch position
then RT positron. Record indication on
indication shall be in normal pressure range,
XMSN OIL PRESS indicator (15) for each
20 to 90 psi. If any switch position does not
switch position.
light, replace switch. If any indicator indica-
tion is not in normal range, go to task 8-9.18.
45.
Compare indications recorded in step 41 and
If Lowest indication recorded in step 44 is not within
step 44.
3 percent of step 41 indication replace switch (14).
46.
Turn knob on XMSN OIL PRESS
Switch position of Lowest indication recorded in
switch (14) to SCAN.
step 44 shall Light. If it does not, replace switch (14).
TASK
RESULT
FOLLOW-ON MAINTENANCE:
Have pilot shutdown engines.
TM 55-1520-240-23
Electrical Power Off
Battery Disconnected
Hydraulic Power Off
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