DA 42 AFM Airplane Description
Doc. No. 7.01.05-E Rev. 8 15-Dec-2017 Page 7 - 61
In accordance with the received signals and a comparison with the programmed
characteristic diagrams the necessary inputs are calculated and transmitted by the
following signal lines to the engine:
- Activation of starter (relay)
- Signal for propeller governor pressure valve
- Signal for the rail-pressure regulation valve
- Signal for each of the 4 injection nozzles
- Activation of the glow plugs
- Signal for the waste gate valve
The following alerts are displayed on PFD of the G1000:
- Glow sparks active
- Status ECU A
- Status ECU B
Normally each engine is controlled and regulated by the appropriate ECU A. The ECU B
is a backup system to ensure redundancy. In case of an internal error during operation
or the loss of a sensor signal the system automatically switches to ECU B. If the loss of
the sensor signal was the cause for the error, the system automatically switches back
to ECU A.
A fault in one of the ECUs is indicated by a caution message on the PFD (L/R ECU A/B
FAIL). In case of minor faults, the annunciation can be reset once by pressing the ECU
TEST button for more than 2 seconds. However, the annunciation will re-appear upon
the next attempt to start the engine. After the indication of the L/R ECU A/B FAIL caution
message, the engine must be serviced, even if the caution message could be reset.
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