TM 55-1520-240-T
8 - 9 . 3 T R A N S M I S S I O N O I L P R E S S U R E I N D I C A T I N G A N D W A R N I N G S Y S T E M O P E R A T I O N A L C H E CK
8 - 9 . 3
INITIAL SETUP
Applicable Configurations:
All
Tools:
None
Materials:
None
Personnel Required:
Aircraft Electrician (2)
Rotary Wing Aviator (2)
References:
TM 55-1520-240-10
TM 55-1520-240-23
Equipment Condition:
TM 55-1520-240-23:
Battery Connected
Electrical Power On
Hydraulic Power Off
Visual Check of Transmission Oil Pressure
Indicating and Warning System Performed
TASK
RESULT
CHECK TRANSMISSION AUXILIARY OIL PRESSURE WARNING SYSTEM
1.
Check that XMSN AUX OIL PRESS capsule (1) is lit.
2. Check that three TRANSMISSION AUX OIL PRESS
lights (2) are Iit.
3. Disconnect plug from forward transmission auxiliary
oil pressure switch (3).
4.
Disconnect plug from aft transmission auxiliary oil
pressure switch (4).
5. Disconnect plug from combining transmission auxil-
iary oil pressure switch (5).
If capsule (1) is not lit, go to task 8-9.4.
If any light (2) is not on, go to task 8-9.5.
FWD TRANSMISSION AUX OIL PRESS light (2) shall
go out, If it is still on, go to task 8-9.6.
AFT TRANSMISSION AUX OIL light (2) shall
go out. If it is still on, go to task 8-9.6.
COMB TRANSMISSION AUX OIL PRESS light (2)
shall go out. If it is still on, go to task 8-9.6.
XMSN AUX OIL PRESS capsule (1) shall go out. If it
is still on, go to task 8-9.7.
TASK
RESULT
6.
7.
8.
9.
10.
11.
12.
13.
Short pin 2 in forward transmission auxiliary oil
pressure switch (3) plug to ground with a wire.
Remove wire.
Short pin 2 in aft transmission auxiliary oil pressure
switch (4) plug to ground with a wire.
Remove wire.
Short pin 2 in combining transmission auxiliary oil
pressure switch (5) plug to ground with a wire.
Remove wire.
Press and release each TRANSMISSION AUX OIL
PRESS light (2).
Connect plugs to combining transmission, aft trans-
mission, and forward transmission auxiliary oil
pressure switches (5, 4, and 3).
XMSN AUX OIL PRESS capsule (1) shall come on.
FWD TRANSMISSION AUX OIL PRESS light (2) shall
come on. If capsule (1) does not come on, go to
task 8-9.8.
Capsule (1) and light (2) shall go out.
XMSN AUX OIL PRESS capsule (1) shall come on.
AFT TRANSMISSION AUX OIL PRESS light (2) shall
come on. If capsule (1) does not come on, go to
task 8-9.8.
Capsule (1) and light (2) shall go out.
XMSN AUX OIL PRESS capsule (1) shall come on.
COMB TRANSMISSION AUX OIL PRESS light (2)
shall come on. If capsule (1) does not come on, go
to task 8-9.8.
Capsule (1) and light (2) shall go out.
Each light (2) shall come on when pressed. If it
does not, go to task 8-9.9.
XMSN AUX OIL PRESS capsule (1) shall come on.
FWD, COMB, and AFT TRANSMISSION AUX OIL
PRESS lights (2) shall come one.
CHECK TRANSMISSION MAIN OIL PRESSURE WARNING SYSTEM
14. Check that XMSN OIL PRESS capsule (6) is lit.
If capsule (6) is not lit, go to task 8-9.10.
NOTE
AFT TRANSMISSION MAIN OIL
PRESS light may take 5 to 7
seconds to come on.
15. Check that six TRANSMISSION MAIN OIL PRESS
If any light is not on, go to task 8-9.11.
lights (7) are lit.
8-158
Change 12
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