Maintenance Manual STEMME S10-VT
Date of Issue: Jan. 01, 1998
Page 3-39
Amendment Nr. 0
Date: --
A4011121_B23.doc
Doc. No. A40-11-121
Yellow caution light for the
Internal Generator
The yellow caution light for the internal generator is ON, if the engine electric system is energised (master
switch ON and either propeller-dome open and locked or engine back-up switch ON) and the engine is not
running. If the engine is running, this light indicates a malfunction of the internal generator bus.
NOTE:
Normally, in case of a malfunction of the internal generator, the main fuel pumps are energised also
by the external generator or by the battery (assuming master switch ON and propeller-dome open
and locked - or engine back-up switch ON), so loss of the internal generator does not automatically
result in loss of the main fuel pumps.
Red
Fire Warning
light
The Fire Warning light is installed on the upper RH instrument panel. On top of the RH and LH
carburetors in the engine bay below the fire-wall, temperature sensors are installed. The sensors are
bimetallic sensors triggering the Fire Warning Light and a warning tone at a set temperature. The warning
light and the warning tone can be tested by pushing the light.
3.7.10 Fuses and Circuit Breakers (CB´s):
See also Fig. 3.2.a
On the RH instrument panel, to the left of the engine instrumentation, following CB´s are installed:
Main CB,
Generator CB,
Landing Gear CB
Main Fuel Pump CB's (LH, RH)
Aux. Fuel Pump CB's (LH, RH)
The total a/c electric system is separated from the battery and the external generator by the Main CB. If the
Main CB is pulled, the battery is still charged by the external generator.
Avionic CB´s are installed in a row on a plate below the avionics. Any other CB´s and fuses are installed in
the E-box and on the electronic plate on the RH side of the instrument panel below the panel cover.
3.7.11 Switches on the Instrument Panel:
See also Fig. 3.2.a
Below the centre avionic panel, a row of switches is installed. From left to right:
Battery Selector Switch (optional)
:
With this switch, the source of avionic power is selected to be the main battery or the additional battery.
The Battery Selector Switch has different functions for powered- or glider-configuration:
Avionic/Battery Switch UP in powered-configuration: Main Avionic Bus 4VV-1 and Secondary Avionic Bus
4VV-2 are both energised by the generator. If the generator fails, both Main Avionic Bus 4VV-1 and
Secondary Avionic Bus 4VV-2 are energised by the main battery.
Avionic/Battery Switch UP in glider configuration: Main Avionic Bus 4VV-1 is connected to the Main Bus
and Secondary Avionic Bus 4VV-2 is not energised.
Avionic/Battery Switch DOWN in powered configuration: Main Avionic Bus 4VV-1 and Secondary Avionic
Bus 4VV-2 are both energised by the generator. If the generator fails, both Main Avionic Bus 4VV-1 and
Secondary Avionic Bus 4VV-2 are energised by the additional battery.
Avionic/Battery Switch DOWN in glider configuration: Both Main Avionic Bus 4VV-1 and Secondary
Avionic Bus 4VV-2 are energised by the additional battery.
The Main Avionic Bus 4VV-1 supplies the electronic equipment, which is required in powered- as well as
in glider-configuration, e. g. COM and gliding computer, normally equipped with GPS. The other avionic
equipment is connected to the Secondary Avionic Bus 4VV-2.
