Bell OH-58A - Circuit Breakers

TM 55-1520-228-BD
ELECTRICAL AND AVIONICS SYSTEM
11-21. CIRCUIT PROTECTION DEVICE REPAIR.
GENERAL INFORMATION: Attempt to main-
tain a fused system at all times.
Circuits with damage circuit breakers
can be repaired by:
a. Circuit breakers of the same
rating salvaged from other non-flyable
aircraft, or removed from other non-
essential circuits in the aircraft.
b.
Replacing circuit breakers with a
specified number of individual strands
of No. 38 AWG wire from No. 26 AWG wire.
OPTION 1:
Salvaged Circuit Breaker
Replacement.
6. Connect back of circuit breaker to
line and bus bar by reinstalling the two
phillips screws.
7.
Place inside star washer and nut on
front of circuit breaker and tighten
with pliers.
8.
Replace plastic face plate on front
of circuit breaker panel with screws
previously removed.
9.
Clean and remove any debris from
inside circuit breaker panel and close
panel. Secure by turning duze fasteners
clockwise.
OPTION 2:
Individual Strands of No. 38
AWG as Circuit Breaker BDAR Repair.
LIMITATIONS: None.
LIMITATIONS: Emergency repair.
PERSONNEL/TIME REQUIRED:
. 1 Soldier
. 20 Minutes
MATERIALS/TOOLS REQUIRED:
. Salvaged Circuit Breaker
. Electrical Tape (item 49, Appx C)
PROCEDURAL STEPS:
1. Gain access to area behind circuit
breaker panel, Figure 11-35, by turning
duze fasteners counterclockwise.
2. Remove screws holding plastic face
plate on circuit breaker panel.
3. Use pliers to remove nut and inside
star lock washer from damaged circuit
breaker.
4. Use phillips screw driver to remove
the two screws from the back of the
circuit breaker.
5. Replace bad circuit breaker with the
salvaged circuit breaker.
PERSONNEL/TIME REQUIRED:
. 1 Soldier
. 20 Minutes
MATERIALS/TOOLS REQUIRED:
. 1 Foot of No. 38 AWG Wire
PROCEDURAL STEPS:
1. Perform steps 1 thru 4 of option 1.
2. Identify the wires hooked to each
circuit breaker.
Typical circuit
breaker is shown in Figure 11-36.
3. Determine amperage of damaged
circuit breaker(s) to be replaced.
(Amperage is printed on the end of reset
button.)
4. Use Table 11-7 to determine number
of strands of No. 38 AWG wire needed to
replace damaged circuit breaker.
5. Select strands of No. 38 AWG wire to
be used. Strands should be 6 to 8
inches long.
11-35