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Main bus:
The 'main bus' is connected to the 'battery bus' via the 'power'-relay. It provides power to the consumers directly connected to the 'main bus' and the 'avionic bus' via the 'avionic master'-relay. The 'AVIONIC MASTER'-switch must be set to 'ON' to connect the 'main bus' to the 'avionic bus'. Under normal operating conditions the 'main bus' is also connected to the 'essential bus' via the 'essential tie'-relay. In the event of an alternator failure the pilot must switch ON the 'ESSENTIAL BUS'-switch (refer to Section 3.7.2 FAILURES IN THE ELECTRICAL SYSTEM). This separates the 'main bus' from the 'essential bus' and the equipment connected to the 'main bus' no longer has power.
Doc. No. 6.01.05-E Revision 3 26-May-2003 Page 7 - 42
Essential bus:
Under normal operating conditions the 'essential bus' is connected to the 'main bus' via the 'essential tie'-relay. The 'essential bus' provides power to the consumers connected to the 'essential bus' and the 'essential avionic bus' via the 'essential avionic'-relay. The 'AVIONIC MASTER'-switch must be set to 'ON' to connect the 'essential bus' to the 'essential avionic bus'. In the event of an alternator failure the pilot must switch ON the 'ESSENTIAL BUS'-switch (refer to Section 3.7.2 FAILURES OF THE ELECTRICAL SYSTEM). This separates the 'essential bus' from the 'main bus'. The 'essential bus' is then connected to the 'hot battery bus' which provides battery power for a limited time to the equipment essential for safe flight and landing. The red warning light on the switch is illuminated when the 'ESSENTIAL BUS'-switch is set to 'ON'.
Consumers
The individual consumers (e.g. radio, electrical fuel transfer pump, position lights, etc.) are connected to the appropriate bus via automatic circuit breakers.
Designations and abbreviations used to identify the circuit breakers are explained in Section 1.5 DEFINITIONS AND ABBREVIATIONS.
Voltmeter
The voltmeter shows the voltage of the ECU bus. Under normal operating conditions the alternator voltage is shown, otherwise it is the voltage of the 'main'-or 'ECU backup'-battery, depending on which battery is actually connected to the 'ECU bus'.
Ammeter
The ammeter displays the intensity of current which is supplied to the electrical system by the alternator.
Landing and taxi lights
Landing and taxi lights are built into the left wing, and are each operated by means of a switch (LANDING, TAXI) on the row of switches on the instrument panel.
Doc. No. 6.01.05-E Revision 3 26-May-2003 Page 7 - 43
Position and strobe lights
Combined position and strobe lights (anti collision lights) are installed on both wing tips.
Each system is operated by a switch (POSITION, STROBE) on the row of switches on
the instrument panel.
Flood light A two-dimensional light emitter is mounted above the instrument panel. It illuminates the instrument panel as well as all levers, switches, etc. With a rotary button (FLOOD) in the left-hand section of the instrument panel the flood light is switched on and its brightness is adjusted.
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