Section 7 Pilot’s Operating Handbook
Description of Airplane and Systems EXTRA 500
Important Do not connect ground power units with a capacity greater
than 1200 A for engine start.
Note It is not possible to connect the starter-generator and an
external (ground-) power source simultaneously to the
aircraft bus system. This is to avoid any uncontrolled
currents between these units.
7.18.e Indication
The digital indicator cluster installed in the left side of the main
panel indicates three electric system parameters:
1
VDC (bus voltage):
During normal operation (generator active) a voltage of approx
28 V should be indicated. With standby alternator the indication
should be about 26 V. Battery nominal voltage is 24 V.
2
GEN AMPS (Generator Load):
Generator load is indicated on this indicator as long as the
generator is active (GENERATOR FAIL warning light off).
Generator Load should be kept below 200 A. In case the
generator is offline this indicator automatically displays the
standby alternator load. The standby alternator load has to stay
below 20 A (see also
7.18.b).
3 BAT AMPS:
The battery amp indicator shows load or charging current on the
battery. A positive indication means battery is being charged, a
negative indication means battery is discharged (load on
battery).
4 Low Voltage Warning:
A yellow LO VOLTAGE caution light in the annunciator panel
illuminates as soon as bus voltage drops below 25.5 V.
7-52 26. January 2011
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