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Storage 'Main'-battery power is stored in a 12 V, 35 Ah lead-acid battery mounted on the right-hand side of the firewall. The 'main' battery is connected to the 'hot battery bus' via a 100 A fuse and to the 'battery bus' via the 'battery'-relay which is installed in the relay junction box on the left-hand side of the firewall.
The 'battery'-relay is controlled with the 'ELECTRIC MASTER'-key switch which is located on the left-hand side of the instrument panel.
Doc. No. 6.01.05-E Revision 3 26-May-2003 Page 7 - 40
In addition, a 12 V, 12 Ah sealed-lead-acid battery ('ECU backup'-battery) is installed under the rear right seat as a further source of power for the 'Engine Control Unit' (ECU B only).
Under normal operating conditions the 'ECU backup'-battery is charged by the 'ECU bus'. In the event of an alternator failure and a depleted 'main'-battery the 'ECU alternate power'-relay connects the 'ECU backup'-battery automatically to ECU B via a 30 A fuse. This prevents the engine from stopping in the unlikely event of an alternator failure and a totally discharged 'main'-battery.
' In addition, a non-rechargeable dry battery is installed in the IFR model as a further source ' of power for the attitude gyro (artificial horizon) and the flood light. When the ' EMERGENCY switch is set to ON, these two systems are supplied with power for 1 hour, ' independent of all other electrical consumers. During each 100 hour inspection, this ' battery is checked for proper functioning. Every 2 years or after use (broken seal on the ' switch) the battery cells must be replaced.
Distribution
Electrical power is distributed via the 'hot battery bus', the 'battery bus', the 'ECU-bus', the 'main bus', the 'essential bus', the 'avionic bus', and the 'essential avionic bus'.
Hot battery bus:
The 'hot battery bus' is directly connected to the 'main'-battery via a 100 A fuse installed in the relay junction box and cannot be disconnected from the 'main'-battery. The 'hot battery bus' provides power to the pilot map/reading light and the accessory power plug which are protected by their own fuses.
Doc. No. 6.01.05-E Revision 3 26-May-2003 Page 7 - 41
Battery bus:
The 'battery bus' is connected to the 'main'-battery via the 'battery'-relay which can be controlled by the 'ELECTRIC MASTER'-key switch. The 'battery bus' provides power to the 'ECU bus' and heavy duty power to the starter. It also provides power to the 'main bus' via the 'power'-relay which can be controlled by the 'ELECTRIC MASTER'-key switch and the 'ESSENTIAL BUS'-switch. The 'ELECTRIC MASTER'-key switch must be set to 'ON' and the 'ESSENTIAL BUS'-switch must be set to OFF to connect the 'battery bus' to the 'main bus'.
The 'battery bus' is also connected to the power output line of the alternator and the power input line of the external power plug.
ECU bus:
The 'ECU bus' is directly connected to the 'battery bus' and provides power for the ECU A and ECU B via the 'ENGINE MASTER'-switch. It also provides power for charging the 'ECU backup'-battery via the 'ECU alternate power'-relay. The 'ENGINE MASTER'-switch must be set to 'ON' to connect the ECU A and ECU B to the 'ECU bus'.
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