if emergency bus voltage is less than 22 volts
or more than 29.5 volts.
The left and right generator AMPS are dis-
played below the emergency bus voltage. If
amps exceed 300 on the ground or in flight, a
“L/R GEN AMPS HIGH” CAS message is
posted. This CAS is inhibited during a cross-
generator start and temporarily suppressed
after engine start. There is no display for the
amperage being drawn from a GPU. APU amps
are displayed on an indicator located on the
APU control panel (Figure 2-6) and on the
EICAS/MFD ELEC system schematic page.
The last electrical parameter displayed on the
SUMRY page is left and right battery TEMP
in degrees Celsius for Ni-Cad batteries only.
All of the electrical system information pre-
sented on the SUMRY page is also displayed
in a schematic format on the EICAS/MFD
ELEC system schematic page (Figure 2-9).
Additionally, the ELEC system schematic dis-
play shows whether EXT PWR is connected
to the airplane and, if the APU generator is con-
nected, APU amps are also displayed.
The display of volts, amps and battery tem-
perature on the EICAS/MFD are color coded.
As limits are exceeded, the digital data changes
color (amber or red). When the data is in its
normal operating range the data is displayed
in white. If any of the data exceeds a limit, the
data changes to the appropriate color and is
boxed in that same color. See Table 2-1, for
limits and color codes.
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
2-14
FOR TRAINING PURPOSES ONLY
FlightSafety
international
COLOR
LIMITS
Essential and Emergency DC Bus Volts
Red
< 18.0
Amber
18.0 – 21.9
White (Normal)
22.0 – 29.5
Amber
29.6 – 31.5
Red
> 31.5
Essential DC Amps
White (Normal)
Amber
Red
Battery Temp (
°
C)
White (Normal)
Amber
> 60 (140
°
F)
Red
> 70 (160
°
F)
< 300
> 300
> 400
< 60 (140
°
F)
Table 2-1. ELECTRICAL LIMITS
