6 - 2
S-40 • S-45
Part No. 102521
Connection
no terminal
P3
Horn button
normally open
T-circuits
connect
FB
Flashing beacon
Diode
Circuits crossing
no connection
Quick disconnect
terminal
BLK
WHT
T-circuits connect
at terminal
WHT #21
TB21
Battery
+
-
Circuit breaker
with amperage
15A
CB1
Horn or alarm
H1
Emergency Stop
button normally
closed
P1
Coil
solenoid or relay
Key switch
(before serial number 22051)
KS1
GROUND
PLATFORM
Power relay
PR1
Toggle switch SPDT
TS2
ST
AR
T
ENGINE
Toggle switch DPDT
TS6
UP
DOWN
PLA
TFORM
LEVEL
Gauge sending unit
HM
Hour meter
N.O.
OTS2
Oil temperature
switch
normally open
N.O.
CTS1
Coolant temperature
switch
normally open
Oil pressure switch
normally closed
N.C.
OPS1
BLK
FS1
Foot switch
Pump
Aux
Auxiliary pump
FAN
Hydraulic oil
cooling fan
G1
Gauge
Tilt sensor
LED
L3
Limit switch
N.C.H.O
N.O.H.C
LS3
Fuse
with amperage
25A
F1
510
Resistor with
ohm value
Starting aid:
glow plug or
flame ignitor
Control relay contact
normally open
CR4
N.O.
Coil
Fuel or RPM
solenoid
PULL
IN
HOLD
C
A
B
Key switch
(after serial number 22050)
KS1
October 2013
Section 6 • Schematics
Electrical Symbols Legend
Property of American Airlines