Flight Manual STEMME S 10 Date of Issue Oct. 1, 1990 page: 46
Amendment No.: 7 Date: May 25. 2005
A4010013_08a-46/13.11.15/2:34
7.8 Electrical System
The electrical system is supplied by a master battery and a generator. The master battery is placed in the
cockpit underneath the right hand control covering.
Master Switch: Disconnects all power supply from the main bus bar.
If main electric circuit is lost, the avionics are automatically switched over to the back-up battery (if fitted).
Lesser Ranking Switches
• Engine master switch / gliding operations: switches the electrical engine equipment (starter, instruments
etc.) on master battery and generator "ON" / "OFF". Suggestion: "OFF" during gliding flight, otherwise
current drain.
• switch for the electric engine starter
• ignition switch "ON" / "OFF"
• avionics: switches all electrically operated control and navigation equipment "ON" / "OFF".
• during starter operations, the avionics are switched off (or over to the back up battery if fitted).
• Landing gear switch:
- upper position: RETRACT
- lower position: LOWER
- center position: circuit disconnected from electrical system.
• ACL (Anti-Collision Lights) only when engine master switch "ON"
• Position lights, only when engine master switch "ON"
Back-up battery
mounting position: left hand foot well
use: preferred supply of avionics during gliding flight. With this, unintentional discharging of
the master battery during gliding flight is prevented and the charge is secured for engine
re-start.
Switching: by switch-over from master to back-up battery with switch labeled "AVIONICS SUPPLY".
Charging: through generator or externally (max. charge voltage 14.7 V.)
All electrical circuits and consumers are protected with circuit breakers (primary circuits of relays with fuses
only).
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