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button between the starter buttons opens
the start circuit if manual termination of the
start sequence is desired (see Figure 2-7).
Pushing the engine start button illuminates a
white light in the starter button as a direct indication
that the start relay is closed.
INDICATIONS
The DC electrical system is monitored by:
• Crew alerting system (CAS) messages
• Engine indicating and crew alerting system
(EICAS) display window
• DC AMPs display
• BATTERY AMPs display
• BATTERY VOLTS display
• Engine start button light
CAS Messages
BATT O’TEMP
With the optional NiCad battery installed, a
battery overtemperature warning system warns
the pilot of abnormally high battery temperatures
(Figure 2-8). An internal temperature
of 63–70°C (145–156°F) displays an amber
BATT O’TEMP message and steady MASTER
CAUTION lights.
If the temperature reaches 71°C (160°F) a red
BATT O’TEMP message displays and the
MASTER WARNING lights flash.
BATT TEMP FAIL
An amber BATT TEMP FAIL message indicates
the battery temperature sensor has
failed (applies to NiCad battery-equipped
aircraft only).
CAUTION
CITATION MUSTANG OPERATING MANUAL
510OM-00 2-11
GEN OFF L-R
Loss of a single generator or an open generator
relay is indicated by an amber GEN OFF
L or R message and triggers steady MASTER
CAUTION lights.
Dual generator failure is annunciated with a
red GEN OFF L-R message and flashing red
MASTER WARNING lights.
AFT JBOX CB L-R
An amber AFT JBOX CB L-R message indicates
the left or right start circuit breaker on
the aft J-box has popped. The circuit breaker
cannot be reset from the cockpit. Maintenance
is required.
AFT JBOX LMT L-R
An amber AFT JBOX LMT L-R message indicates
failure of a 200-amp current limiter.
EICAS Display Window
The DC window of the EICAS display provides
dual generator indications (left and right) for
both voltage (VOLTS) and current (AMPS),
and also BATTERY voltage and current.
VOLTS Display
The left and right generator VOLTS displays
are on the upper-left area of the DC window
(Figure 2-9). Each VOLTS display indicates
voltage at its respective generator. In reversionary
mode, only the digits are displayed.
AMPS Display
The left and right generator AMPS displays are
on the upper-right area of the DC window
(Figure 2-9). Each display indicates current
flow from its respective generator to its respective
DC feed bus. During normal operation,
the indication should be parallel within
±10% of total load. Amperage between the
starter-generator and the battery bus is not reflected
on the AMPS displays. In reversionary
mode, only the digits are displayed.
BATTERY–VOLTS Display
The BATTERY–VOLTS display is a digital
display on the bottom-center area of the DC
window. The display indicates voltage on the
battery bus.
CITATION MUSTANG OPERATING MANUAL
2-12 510OM-00
Figure 2-9. Electric Display (Normal)
8K2
KANY
PPH
°C
TRIM
AILERON
RUDDER
FLAPS
CAS
GEN OFF L-R
BATT O’TEMP
BATT TEMP FAIL
AFT JBOX CB L-R
AFT JBOX LMT L-R
UP
TO/APR
LAND
DEST ELV
DIFF PSI
0 5 10
1040 950
13
1400 -400
0.8
1330
0
0 -1
5
10
CAS CAS NEXRAD ECHO TOP
Figure 2-8. CAS Messages
BATTERY–AMPS Display
The BATTERY–AMPS display is a digital display
on the bottom of the DC window (Figure
2-9). The display indicates current into or
from the battery. Positive amperage indicates
battery charging. Negative amperage indicates
battery discharge.
OPERATION
PREFLIGHT
During the interior preflight, place the generator
switches to GEN if the intention is a
battery start or to the OFF position if external
power is desired. Place the battery switch
to BATT and verify the voltage display for
24 volts minimum (22 volts minimum for
NiCad).
After checking lights and pitot heat, turn the
battery switch to the OFF position. During
the exterior preflight, visually check the battery
for signs of deterioration or corrosion. Do
not connect external power until completing
these checks.
STARTING (FIRST ENGINE)
Before starting the engines, recheck the generator
switches for proper position and verify
battery voltage. Ensure that the battery switch
　
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