Airplane Description
DA 42 AFM
Page 7 - 56
Rev. 8
15-Dec-2017
Doc. No. 7.01.05-E
Distribution
Electrical power is distributed via the HOT BATTERY BUS, the BATTERY BUS, the LH
(RH) ECU BUS, the LH (RH) MAIN BUS, and the AVIONIC BUS.
HOT BATTERY BUS:
The HOT BATTERY BUS is directly connected to the MAIN BATTERY and cannot be
disconnected from the MAIN BATTERY. The HOT BATTERY BUS provides power to
the pilot map/reading light and ELT RCPI unit which are protected by there own fuses.
BATTERY BUS:
The BATTERY BUS is connected to the main battery via the battery relay which can be
controlled by the ELECTRIC MASTER switch. The BATTERY BUS provides power to
the LH (RH) MAIN BUS and heavy duty power to both starters.
ECU BUS:
The LH (RH) ECU BUS is connected to the LH (RH) MAIN BUS via a diode and connected
to the power output line of the alternator via diode and a 30 Ampère circuit breaker and
provides power for the ECU A and ECU B via the LH (RH) ECU A (B) relays which are
controlled by the LH (RH) ENGINE MASTER switch. The LH (RH) ENGINE MASTER
switch must be set to ON to connect the ECU A and ECU B to the ECU BUS.
To support the alternator electrical power supply to the ECUs in case of a malfunction
of the main battery, additional sealed-lead-acid batteries (ECU backup battery) are
connected to the RH and LH ECU BUS.
If OÄM 42-129 is carried out:
These batteries are able to provide 30 minutes of engine operation in case of a complete
airplane electrical failure. Both engines may stop if the 30 minutes have elapsed.
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