Airplane Maintenance Manual
Bristell
B23
Chapter 24
Chapter 24 Page 2
Issue: 30-Sep-2020
24-00
General
The airplane is equipped with 14V DC electrical installations with
grounded negative pole. The primary DC electrical sources are an AC
alternator in combination with an external electronics full-wave
rectifier regulator and an auxiliary generator. The secondary source of
electrical energy is the 12V battery, which is located on the firewall. It
is used for starting the engine and in the case of generator failure as
a back
–
up source of electric energy. An additional backup battery
supplies the ADAHRS, PFD and EIS, the glare shield and flap position
lights.
DC voltage is distributed to the individual systems by means of the
main bus bar. Systems are protected by circuit breakers which are
permanently ON and switches
–
circuit breakers which may be turned
to ON as needed. If one of the circuits is overloaded, then the circuit
breaker disconnects the circuit.
After switching the MASTER SWITCH ON and by turning the ignition
key to the position START the starter is activated. The starter is
supplied from the battery before starting the engine. After starting up
the engine and reaching the idle RPM, the generator starts supplying
current to the electrical network.
Information about voltage in the main bus bar is indicated by low
voltage red light on the instrument panel.
