10-2.3 FUEL BOOST PUMP SYSTEM OPERATIONAL CHECK
(Continued)
1.
2.
3.
4.
5.
6.
7,
TM 55-1520-240-T
10-2.3
TASK
RESULT
TASK
RESULT
Check that LH FUEL PUMPS MAIN
FWD, MAIN AFT, AUX FWD, and AUX
AFT AC circuit breakers (1,2,3, and 4)
are closed.
Check that LH FUEL PUMP CONT AUX
AFT, MAIN AFT, MAIN FWD, and AUX
FWD DC circuit breakers (5,6, 7, and 8)
are closed.
Check that RH FUEL PUMPS MAIN
FWD, MAIN AFT, AUX FWD, and AUX
AFT AC circuit breakers (9, 10, 11, and
12) are closed.
Check that RH FUEL PUMP CONT AUX
AFT, MAIN AFT, MAIN FWD, and AUX
FWD, DC circuit breakers (13, 14, 15,
and 16) are closed.
Check that all FUEL PUMP switches (21,
22, 23, 24, 25, 26, 27, 27 and 28) on FUEL
CONTROL PANEL are set to OFF.
Press and release LEFT SIDE AUX
PRESSURE light (17).
Press and release RIGHT SIDE AUX
PRESSURE light (18).
If circuit breaker (1) is open, close it, If it opens
again, go to Task 10-2.4. If circuit breaker (2) is
open, close it. If it opens again, go to Task 10-2.5,
If circuit breaker (3) is open, close it. If it opens
again, go to Task 10-2.6. If circuit breaker (4) is
open, close it. If it opens again, go to Task 10-2.7.
if circuit breaker (5) is open, ciose it, if it opens
again, go to Task 10-2.8. If circuit breaker (6) is
open, close it. If it opens again, go to Task 10-2.9
If circuit breaker (7) is open, close it. If it opens
again, go to Task 10-2.10. If circuit breaker (8) is
open, close it. If it opens again, go to Task 10-
2.11.
If circuit breaker (9) is open, close it, If it opens
again, go to Task 10-2.12. If circuit breaker (10) is
open, close it, If it opens again, go to Task 10-
2.13. If circuit breaker (11) is open, close it. If it
opens again, go to Task 10-2.14. If circuit breaker
(12) is open, close it. If it opens again, go to Task
10-2.15.
If circuit breaker (13) is open, close it. If it opens
again, go to Task 10-2.16. If circuit breaker (14) is
open, close it. If it opens again, go to Task 10-
2.17. If circuit breaker (15) is open, close it. If it
opens again, go to Task 10-2.18. If circuit breaker
(16) is open, close it. If it opens again, go to Task
10-2.19.
If switches are ON, set them to OFF.
AUX PRESSURE light (17) shall momentarily
come on. If it does not, go to Task 10-2.20.
AUX PRESSURE light (18) shall momentarily
come on. If it does not, go to Task 10-2.20.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
An inoperative fuel pump in main
tanks cannot be detected unless
the following methods, steps 8
thru 17, are utilized. Flight opera-
tions with an undeteced pump
failure can result in engine
flameout when operative pump
fails. This could result in loss of
helicopter lift.
Check that L FUEL PRESS capsule (19) is
lit.
Check that R FUEL PRESS capsuIe (20)
is lit.
Have pilot start engines and stabilize rotors at
ground idle. Set eight FUEL PUMP
switches (21 through 28) to OFF.
Set LEFT SIDE MAIN AFT FUEL PUMP
switch (21) to ON.
Set LEFT SIDE MAIN AFT FUEL PUMP
switch (21) to OFF.
Set LEFT SIDE MAIN FWD FUEL
PUMP switch (22) to ON.
Set LEFT SIDE MAIN FWD FUEL
PUMP switch (22) to OFF.
Set RIGHT SIDE MAIN FWD FUEL
PUMP switch (24) to ON.
Set RIGHT SIDE MAIN FWD FUEL
PUMP switch (24) to OFF.
Set RIGHT SIDE MAIN AFT FUEL
PUMP switch (23) to ON.
Set RIGHT SIDE MAIN AFT FUEL
PUMP switch (23) to OFF.
If capsule (19) is not lit, go to Task 10-2.21.
If capsule (20) is not lit, go to Task 10-2.21.
Capsule (19) shall go out. If not, go to Task 10-
2.22.
Capsule (19) shall come on. If not, go to Task 10-
2.21.
Capsule (19) shall go out. If not, go to Task 10-
2.23.
Capsule (19) shall come on. If not, go to Task 10-
2.21.
Capsule (20) shall go out. If not, go to Task 10-
2.24.
Capsule (20) shall come on. If not, go to Task 10-
2.21.
Capsule (20) shall go out. If not, go to Task 10-
2.25.
Capsule (20) shall come on. If not, go to Task 10-
2.21.
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Change 2
10-43