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• Activating the airplane system light
(LTS) test on the system test switch.
• Airplane becomes airborne.
WARNING SYSTEM
LIGHTS
SYSTEM TEST
The CWP and master WARN/CAUT lights are
tested using the system test rotary switch in
the “LTS” position (Figure 4-2). The system
test switch is located on the center pedestal for-
ward of the throttle quadrant. Depressing the
system test knob with the LTS position se-
lected will initiate a test of the following:
• Aural master warn tone (three chimes)
will sound and repeat until the test is re-
leased.
• Master WARN/CAUT lights will flash.
• Progressive test of FGC green lights
• All of the CWP annunciators will illu-
minate.
• Engine “FIRE PUSH” pushbuttons on
the engine/fuel control panel will illu-
minate (steady).
• All switch/indicators (S/Is) will illu-
minate.
• All digit segments on the CPCS (cabin
pressure control system) will illuminate.
• If optional APU is installed - all APU
control panel annunciators and S/Is il-
luminate and white “888” illuminates
in the APU amps display.
If the LTS test is held depressed for more than
15 seconds, the CWP will play through all
t o n e s a n d vo i c e m e s s a g e s s e q u e n t i a l l y.
Depressing either master WARN/CAUT switch
or the mute switch on the right throttle will
mute the voice messages.
The fire detect lights (FIRE PUSH) are tested
in the LTS position, but the detection system
is tested separately in the “FIRE DET” posi-
tion of the system test switch.
The system test switch is 28 VDC powered
from the left main bus and is protected by a cir-
cuit breaker located on the pilot circuit breaker
panel within the INSTRUMENTS/INDICA-
TIONS group. The circuit breaker is labeled
SYSTEM TEST.
Both master WARN/CAUT lights and the CWP
receive power from the left and right essential
busses. Should one of the essential busses fail
L E A R J E T 4 5
P I L O T T R A I N I N G M A N U A L
4-4
FOR TRAINING PURPOSES ONLY
FlightSafety
international
PR
ES
S
TES
T
I3 I . I 5
I I3.80
1
COM
NAV
SQ
NAV
AUDIO
CLR DLY
OFF
G
E
A
R
F
R
E
E
F
A
L
L
P
U
S
H
D
O
W
N
PIT TRIM
BIAS
RUD BOOST
G/S INHB
FLAP OVRD
GPWS
RADIO CTL
HOT BUS
E
L
E
V
P
U
L
L
&
D
I
S
C
SYS TEST/RESET
FLAP
RESET
ANTI
-ICE
SPLRN
RESET
STALL
GPWS
ADC
FLAPS
GEAR
LTS
FIRE
DET
OFF
NDN
MODES
NUP
Honeywell
ON
Figure 4-2. System Test Switch on Center Pedestal