TM 55-1520-240-T
4-13.3 ENGINE ACCESSORY GEARBOX CHIP DETECTORS OPERATIONAL CHECK (Continued)
4-13.3
TASK
RESULT
1.
Check that HYDRAULICS MAINT PNL circuit breaker
If circuit breaker (1) is open, close it. If it opens again, go
(1) is closed.
to task 8-14.3.
2.
Check master caution panel (2).
If ENG 1 or ENG 2 CHIP DETR capsule (3 or 4) is lit, go
to task 4-13.4.
3.
Check NO. 1 and NO. 2 ENGINE CHIP DETECTOR
Both indicators shall be all-black. If either indicator dis-
indicators (5 and 6).
plays black-and-white fan, go to task 4-13.5.
4.
Set and hold GND switch (7) to TEST.
ENG 1 and ENG 2 CHIP DETR capsules (3 and 4) shall
come on. NO. 1 and NO. 2 ENGINE CHIP DETECTOR
indicators (5 and 6) shall change to black and white fan.
If ENG 1 CHIP DETR capsule is out, go to task 4-13.6. If
ENG 2 CHIP DETR capsule is out, go to task 4-13.7. If
NO. 1 or NO. 2 ENGINE CHIP DETECTOR indicator is
all-black, go to task 4-13.8.
5.
Set GND switch (7) to RESET, then to GND.
NO. 1 and NO. 2 ENGINE CHIP DETECTOR indicators (5
and 6) shall change to all-black. If both indicator displays
are not black, go to task 4-13.5.
CHECK NO. 1 ENGINE ACCESSORY
GEARBOX CHIP DETECTOR
6.
Short terminal stud of NO. 1 engine chip detector (8)
ENG 1 CHIP DETR capsule (3) shall come on and NO. 1
to its mounting base with a jumper wire.
ENGINE CHIP DETECTOR indicator (5) shall change to
black-and white fan. It capsule does not come on and
indicator display does not change, go to task 4-13.9.
7.
Remove jumper.
ENG 1 CHIP DETR capsule (3) shall go out. If it stays on,
go to task 4-13.4.
8.
Set GND switch (7) to RESET, THEN TO GND.
NO. 1 ENGINE CHIP DETECTOR indicator (5) display
shall change to all-black. If it does not, go to task 4-13.5.
CHECK NO. 2 ENGINE ACCESSORY
GEARBOX CHIP DETECTOR
9.
Short terminal stud of No. 2 engine chip detector (8)
ENG 2 CHIP DETR capsule (4) shall come on and NO. 2
to its mounting base with a jumper wire.
ENGINE CHIP DETECTOR indicator (6) shall change to
black-and-white fan. If capsule does not come and indi-
cator display does not change, go to task 4-13.9.
10.
Remove jumper.
ENG 2 CHIP DETR capsule (4) shall go out. If it stays on,
go to task 4-13.4.
TASK
RESULT
11.
Set GND switch (7) to RESET then to GND.
NO. 2 ENGINE CHIP DETECTOR indicator (6) display
shall change to all-black. If it does not, go to task 4-13.5.
FOLLOW-ON MAINTENANCE:
TM 55-1520-240-23:
Remove electrical power.
Disconnect battery.
Close No. 1 or No. 2 engine work platform
and access door.
END OF TASK
Change 17 4-317
