TM 1-1520-238-T-4
6–106
6–43.
VIB MON CIRCUIT BREAKER (CB79) – DOES NOT STAY CLOSED
6–43
Tools:
Nomenclature
Part Number
Tool Kit, Electrical
SC518099CLA06
Repairer’s
Multimeter, Digital
AN/PSM-45
Personnel Required:
68F
Aircraft Electrician
References:
TM 1-1520-238-T-6
TM 1-1520-238-23
WARNING
Turn off power before detaching or
attaching wires and connectors. High
current 28 VDC or 115 VAC is present.
Failure to do so could result in death or
serious injury.
1. With VIB MON circuit breaker open. Check for
short between P128–P and ground.
Does short exist?
YES
Go to step 2.
NO
Replace rotor balance signal
processor (TM 1-1520-238-23).
2. Detach P1. Check for short between P128–P
and ground.
Does short exist?
YES
Repair shorted wire between:
P440–B14 and P128–P.
(A402):
J1–10 and J16–B14.
Go to paragraph 6–12.
NO
Refer to TM 1-1520-238-T-6 to
troubleshoot circuit protection
system (dc essential bus 2 –
pilot station).
END OF TASK
