TM 55-1520-240-23-7
9-9.1
INSPECT CIRCUIT BREAKERS
9-9.1
INITIAL SETUP
Applicable Configurations:
All
Tools:
Aircraft Electrical Tool Kit, NSN 5180-00-323-4915
Personnel Required:
Aircraft Electrician
Equipment Required:
Battery Disconnected
Electrical Power Off
Hydraulic Power Off
References:
TM 55-1500-323-24
Task 9-10
Task 9-11
1.
Visually inspect all No. 1 and No. 2 PDP circuit
breakers for evidence of water/moisture entry,
arcing/burning, and corrosion.
2.
Replace dc circuit breakers that show any
evidence of arcing/burning or that show
excessive corrosion in terminal contact areas
(Tasks 9-10 and 9-11).
NOTE
Multi-phase (ac) circuit breakers are
more susceptible to phase shorts due
to corrosion forming a conductive path
between case terminal and metal
restraint pins.
3.
Replace ac circuit breakers that show
any evidence of water/moisture entry or
arcing/burning. Pay particular attention to
terminals, case seams, lower hardware, and
case restraint pins for any signs of forming
corrosion. As a general rule, corrosion in these
areas shall require circuit breaker replacement
(Tasks 9-10 and 9-11).
4.
Replace any power distribution/feeder wire
showing sign of fraying/chaffing or arcing/burning.
Refer to TM 55-1500-323-24, Section 14.
FOLLOW-ON MAINTENANCE:
As Required
END OF TASK
9-40
