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and right emergency hot buses. Battery power to the left and right hot
buses also passes through a single 20-amp fuse and 15-amp circuit
breakers for each bus.
The left and right fire extinguishers and the left and right Firewall Shutoff
Valves (FWSOVs) receive power through the left and right
emergency hot buses, respectively. These items can also receive power
from the emergency battery, either engine generator, or external power
source. The tailcone utility light, Single-Point Pressure Refueling
(SPPR) and baggage compartment lights are powered through the rear
hot bus. Additional hot bus items include the cockpit overhead lights
and entry lights. The hot buses are connected directly to both of the
main batteries and to the external power connector through the left
generator bus.
Power to the radio control hot bus is controlled with a momentary action
switch on the center pedestal, just forward of the throttle quadrant.
The radio control hot bus can only be selected ON when the airplane
batteries are OFF. If the radio control hot bus is selected ON and the batteries
are subsequently selected ON, the radio control hot bus will automatically
be turned off and the ON annunciator on the switch will
extinguish. The switch is labeled RADIO CONTROL HOT BUS. When
this switch is depressed, the ON annunciator on the switch will illuminate
and main battery power through the right forward hot bus will
power the following (normal power source shown in parenthesis):
- Left audio control unit (L ESS)
- Clearance delivery radio (L ESS)
- Comm sections of the integrated communication unit #1 (L ESS)
- Nav section of the integrated navigation unit #1 (L ESS)
Pilot’s Manual
4-16 PM-132A
Ground power can be connected to the airplane as previously
described in this section under GROUND POWER UNIT. With ground
power connected, the bus-tie will automatically close and the output of
the GPU is applied to the left and right generator buses and nonessential
buses. With the main and emergency batteries selected On,
external power is distributed to the rest of the dc electrical system. The
airplane batteries (main and emergency) will then be charged from the
power supplied by the GPU.
The external power supplied to the dc electrical system can then be
monitored as described under ELECTRICAL SYSTEM INDICATORS
in this section.
Various-sized fuses are installed throughout the electrical system to
provide circuit protection. Each fuse will carry more than its rated
capacity for a short period of time. Extreme or prolonged overloading
will cause a fuse to blow, isolating a particular circuit and precluding
progressive failure of other electrical components. Fuses cannot be
reset. When a fuse has blown, it must be replaced. Fuses are located
within the aft and forward left and right Power Distribution Panels
(PDPs).
Contactors which are particularly suited for circuits with heavy
electrical loads are used throughout the electrical system. Contactors
function as remote switches to make or break power circuits. Most of
the contactors in the electrical system automatically close and open for
given conditions. Some, such as the battery, and GPU, are manually selected
open and closed with the respective switches on the electrical
control panel, but can also open automatically if monitored faults are
detected.
A circuit breaker is designed to open and interrupt current flow in the
event of a malfunction. Once opened, it may be reset by pushing it back
in. An open circuit breaker may be identified by a white base which can
only be seen when it is in the open or tripped position.
Most of the airplane’s circuit breakers are located on two circuit breaker
panels in the cockpit, one on the pilot’s left side panel and one on the
copilot’s right side panel.
The circuit breakers are thermal type mechanisms and the amperage
ratings are stamped on the top of each circuit breaker.
The circuit breakers are grouped by systems rather than by buses.
Pilot’s Manual
PM-132A 4-17
Emergency bus circuit breakers have red rings around them to easily
distinguish them from the other circuit breakers.
The individual circuit breaker labels, grouping labels and dividing
lines are illuminated with electroluminescent lighting. There are no
bulbs in the panels, but the panels glow when current is flowing
through wires imbedded in them. The silk-screened panels allow light
to shine through the lettering on the panels. The intensity of the
lighting is controlled with the CB PANEL rheostat located on the pilot’s
and copilot’s CREW LIGHTS panels.
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