Airplane Description DA 42 AFM
Page 7 - 54 Rev. 8 15-Dec-2017 Doc. No. 7.01.05-E
7.10.1 GENERAL
The DA 42 has 28 Volt DC system, which can be sub-divided into:
- Power generation
- Storage
- Distribution
- Consumers
Power Generation
Power generation is provided by two 60 Ampère alternators (generators) which are
mounted on the bottom left side of each engine. The alternators are driven by a flat belt.
The power output line of the left hand alternator is connected to the LH MAIN BUS via
the LH alternator relay and a 70 Ampère circuit breaker. The power output line of the RH
alternator is connected to the RH MAIN BUS via the RH alternator relay and a 70 Ampère
circuit breaker. Both main busses are connected to the BATTERY BUS via a 90 Ampère
circuit breaker.
Both generator power output lines also run through a current sensor for each alternator,
which provides an indication of the power being supplied to the electrical system by an
alternator including the current for battery charging on the G1000. In the event of a main
battery failure the field of each alternator is energized by two 12 V, 1.3 Ah sealed lead
acid batteries (excitation battery) connected in series, which are installed in the nose
baggage compartment. The ENGINE MASTER LH (RH) switches connect the excitation
battery to the alternator field via a 5 Ampère fuse.
If MÄM 42-240 or OÄM 42-074 or OÄM 42-129 are carried out:
The ENGINE MASTER LH (RH) switches connect the excitation battery to the alternator
field via a 10 Ampère fuse.
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