Bell OH-58A Technical Manual page 214

TM 55-1520-228-BD
ELECTRICAL AND AVIONICS SYSTEM
LIMITATIONS: None.
PERSONNEL/TIME REQUIRED:
. 1 Soldier
. 30 Minutes
MATERIALS/TOOLS REQUIRED:
. Salvaged Power Relay
PROCEDURAL STEPS:
Obtain salvaged power relay.
1.
Disconnect battery.
2.
Remove damaged power relay as
3.
follows:
NOTE
Note the position of wires/bus bar
and what terminals they are con-
nected to.
a. Remove attaching hardware, wires,
and bus bar.
b. Remove attachment bolt, and lift
relay free from compartment.
Position salvaged power relay, and
4.
install mounting hardware.
5. Install wires and bus bar on correct
terminals, and secure with hardware.
6. Record BDAR action taken. When
mission is complete, as soon as
practical, repair the equipment/system
using standard maintenance procedures.
OPTION 2: Creating a Jumper for Damaged
Power Relays.
CAUTION
. Do not jumper battery relay on
an aircraft.
. This procedure is to be used
only for one time emergency
evacuation and recovery of
OH-58 A/C.
11-42
LIMITATIONS: Emergency repair. No
control over jumpered power relays,
circuit cannot be turned on or off.
PERSONNEL/TIME REQUIRED:
. 1 Soldier
. 20 Minutes
MATERIALS/TOOLS REQUIRED:
. Appropriate Size Aircraft Type Wire
. Appropriate Size Terminal Lugs
PROCEDURAL STEPS:
1.
Disconnect battery.
2. Figure 11-43, Type A and B, shows
two typical power relay configurations
with jumper. This may be used as an aid
in performing steps 3 thru 7.
NOTE
Use wire with the same gage or
larger than the one being replaced.
3. Prepare a jumper wire, Figure 11-44.
(A 1/2 to 1 foot length of appropriate
size aircraft wire with appropriate size
terminal lugs crimped on each end.)
4. Locate terminals marked A1 and A2
on power relay.
should be marked on case of relay. If
markings are illegible, A1 and A2 ter-
minals will be the ones with the largest
diameter terminal studs.
5. Remove hardware from terminals A1
and A2.
6. Install jumper from terminal A1 to
terminal A2.
Reference Figure 11-45,
Type A and B.
7. Install hardware on terminals A1 and
A2. Tighten hardware to hold jumper in
place.
8. Remove jumper as soon as emergency
evacuation flight is completed.
Power relay terminals