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relay closes, the external power relay deenergizes
to remove external power from the
battery bus. This prevents the aircraft generators
and the GPU from simultaneously applying
power to the aircraft buses.
CAUTION
CITATION MUSTANG OPERATING MANUAL
510OM-00 2-5
Figure 2-4. GPU Receptacle
If the battery is charged using the
GPU, it must be monitored. Current
from most GPUs is not regulated and
a battery overheat may occur.
DISTRIBUTION
DC power is distributed throughout the aircraft
though several buses (see Figure 2-1) via the
main junction box (aft J-box) and cockpit
buses (behind CB panels).
Main Junction Box (Aft J-Box)
The main junction box (aft J-box) (Figure 2-5)
in the tail cone compartment contains:
• Two feed buses:
• Left feed bus No. 1
• Right feed bus No. 1
• Two start buses:
• Left start bus No. 1
• Right start bus No. 1
• Two shunt buses:
• Left shunt bus
• Right shunt bus
• Crossfeed bus
• Battery bus
Main Feed Buses
Each generator (left and right) normally supplies
power through its respective generator
relay to its respective main feed bus (left feed
bus No. 1 and right feed bus No. 1). These buses
are tied together through the crossfeed bus.
Start Buses
The left and right start buses provide power to
the left and right start No. 2 buses and those
provide power to the controllers and related systems.
In order for the start relay to close, the
battery switch must be in the BATT position.
When the respective start relay closes, the
start bus is connected to the battery bus, which
supplies power from the battery or a GPU.
Shunt Buses
The left and right shunt buses connect the
starter-generators to the electrical system. The
GCUs and starter-generators manage the connection
of the start buses through the left and
right start relay and the left and right generator
relay. With the exception of a cross-generator
start, normally only one relay at a time
(either start relay or generator relay) is closed
on each side to connect the corresponding
start bus to the electrical system.
CAUTION
CITATION MUSTANG OPERATING MANUAL
2-6 510OM-00
Figure 2-5. Aft J-Box
Crossfeed Bus
The crossfeed bus functions solely as a bus tie
connecting the battery bus, the emergency
buses, and the two main feed buses into one
integral system.
If the battery switch is selected to BATT, the
battery power relay closes, which connects
the battery bus to the crossfeed bus. Power extends
from the crossfeed bus through 200-
amp current limiters to each main feed bus.
Power also extends from the crossfeed bus to
the cockpit emergency power circuit-breaker
buses and (through the avionics power switch)
to the avionics buses.
Battery Bus
The battery bus is connected directly to the battery.
It may receive power from a GPU and during
normal operation, receives its power from
either or both generators.
Cockpit Distribution and
CB Panels
Various feed-extension buses, avionics buses,
emergency buses, and the interior buses are in
the cockpit.
Feed Extension Buses
From each main feed bus (left feed No. 1 and
right feed No. 1) in the tail cone, various extension
feed buses distribute power to components
through controls and circuit breakers
in the cockpit. The main left and right feedextension
buses are behind the pilot and copilot
CB panels respectively (Figure 2-6). Other
feed-extension buses are also behind the corresponding
CB panels and are powered through
25-amp circuit breakers.
Avionics Buses
Avionics buses (left and right) are powered
from the respective main feed buses through
solid-state relays (SSRs) when the AVN MASTER
switch is selected ON. These buses provide
power to the aircraft avionics, except the
avionics that are on the emergency buses.
Emergency Buses
Emergency bus items are listed in Table 2-1.
The aircraft has five emergency buses:
• Emergency power circuit-breaker bus
• Left electrical emergency bus
• Right electrical emergency bus
• Left avionics emergency bus
• Right avionics emergency bus (with
standby battery)
The emergency power circuit-breaker bus is directly
connected to the battery bus at all times.
Other buses are powered from either the crossfeed
bus, the battery bus, or the standby battery.
With the battery switch in the BATT position,
power to the emergency buses is from the
　
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