Airplane Maintenance Manual
Bristell
B23-915
Chapter 24
supplement
Chapter 24 Page 2
Issue: 09.12.2021
24-00
General
The airplane is equipped with 14V DC electrical installations with
grounded negative pole. The primary DC electrical sources are two
internal AC generators (control only internally by the ECU/EMS) in
combination with an external alternator. An additional 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/alternator
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, activating Lane A and Lane B,
switching the main fuel pump ON and by switching and holding the
START POWER toggle switch and pressing the START BUTTON 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 caution,
warning display on the PFD (and corresponding LED light on the
instrument panel).
