AIRCRAFT FLIGHT
MANUAL
BRISTELL B23
Document No.: ADXC-73-001-AFM
Non-approved page
Revision: A2
7-30
Date of Issue: 15.04.2021
NOTE:
“Day” position for both dimmers is fully turned anti-clockwise
Losing power on either bus and/or on the EIS CB leads to partial loss of
the information. Restoring power by means of the Back-Up battery does
restore the function of the EMS unit (GEA24), and the power input to the
indication light control.
Instrument lighting is mainly provided by the respective screens, refer to
the avionic section.
A further feature of the internal light system is the Day/Night switch
located in the centre panel. The switch reduces the brightness of the trim
indication for night operation to a fixed value and switched ON the
compass light (optional, if installed).
7.11.2 Use of back-up battery
The power input to the consumers which can be fed from the back-up
battery (ADHRS/PFD/EIS/Glareshield light/Indication light intensity
control) is separated from the regular power input by means of diodes.
The consumer will utilize the power which provides the higher voltage.
So, in order to make sure the back-up battery is actually used (and main
battery energy is conserved for other functions) the pilot has to pull the
CS’s of ADHRS, PFD, EIS and Dimmer.
This in turn means the functionality of low fuel warning and the indication
light dimming function is not available.
