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advisable to disconnect the battery to prevent
frequency memory circuits, or other equipment
that may be powered by the battery bus,
from draining the batteries.
A battery in good condition supplies power to
all buses for a minimum of 10 minutes with
maximum load. If powering only the battery
and emergency buses, battery life should be a
minimum of 30 minutes.
An INTERIOR DISCONNECT switch is on the
pilot side console panel (Figure 2-3). When the
switch is selected to the up position, the master
interior relay opens, shutting off all electrical
power in the cabin. When the switch is
in the NORM position, the master interior
relay closes, and electrical power flows to the
cabin normally (when DC power is available
and the other electrical controls are in the appropriate
positions).
STANDBY BATTERY
The standby instrument battery is a 1.2 amphour
sealed lead-acid battery. The standby
battery is controlled with the AVIONICS
STBY INST switch.
The standby instrument battery is in the
radome on the avionics shelf assembly. The
battery automatically supplies electrical power
to the standby airspeed, attitude, and altitude
instruments and the lighting for the whiskey
compass when normal electrical power is not
available.
STARTER-GENERATORS
Two engine-driven DC starter-generators (one
on each engine accessory gearbox) are the
CITATION MUSTANG OPERATING MANUAL
2-4 510OM-00
OXYGEN MASK
MIC PHONE MIC BATTERY INTERIOR
DISCONNECT
NORM
HEADSET DISCONNECT
Figure 2-3. Battery Disconnect Switch
Figure 2-2. Battery
primary source of aircraft electrical power
and supply power to all DC buses. Each generator
is air cooled, rated at 29 VDC, and regulated
to 28.5 volts.
The generators are engine-starting motors that
revert to generators at the completion of the
start cycle. Each generator system operates independently,
but power distributes evenly
through bus systems that are in parallel except
during fault conditions.
DC power from the engine-driven generators
distributes to two feed buses (see Figure 2-1).
Each feed bus connects through a 200-amp
current limiter to the crossfeed bus, allowing
each feed bus to parallel the other.
During normal operation, the generators share
loads equally (within ±10% of the total load) via
the crossfeed bus. Each starter-generator is regulated
by its own generator control unit (GCU).
Generator power routes from the crossfeed bus
through the battery relay (when it is closed) to
the battery bus. This provides power to charge
the battery, and during generator operation powers
the items on the battery bus.
Normally (with the battery switch set to
BATT), generator power routes from the crossfeed
bus through the emergency relay to power
the cockpit emergency buses and through the
battery relay to power the emergency bus in
the J-box. The battery and emergency relays
are operated with the battery switch.
GROUND POWER UNIT
A GPU can be connected to the aircraft DC system
through a receptacle in the fuselage below
the right engine nacelle (Figure 2-4). External
power is routed through the external power
relay to the battery bus. The battery charges
from the GPU, regardless of the battery switch
position.
A GPU providing a maximum voltage of 29
VDC may be used. The left and right start
controllers monitor GPU voltage and open the
external power relay to disconnect the GPU
from the aircraft if voltage exceeds approximately
32.5 VDC.
Before connecting a GPU, ensure that the voltage
of the GPU is regulated to 28–29 volts the
amperage output between 800 and 1,100 amps.
When using external power for prolonged
ground operation (over 30 minutes), disconnect
the battery to preclude overheating the battery.
Do not use the battery disconnect switch.
Some GPUs do not have reverse-current
protection. If the GPU is powered
off while connected to the
aircraft, the battery may be rapidly
discharged and/or damaged. Always
disconnect the GPU from the aircraft
when not in use.
Connecting the external power source energizes
the external power relay, which connects
the external power source to the battery
bus. Setting the battery switch to the BATT position
energizes the battery relay, which allows
the connection of external (or battery) power
from the battery bus to the emergency buses,
and through the crossfeed bus to the left and
right feed buses.
When either the left or right generator power
　
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