DV 20 E AFM Airplane Description
Doc. No. 4.01.15-E Rev. 2 22-Mar-2022 Page 7 - 27
START Button
Pressing the START button starts the engine.
LANE SELECTOR Switch
There is a LANE SELECTOR switch. For normal operation the switch is set to AUTO.
The engine is controlled by either LANE A or LANE B. In case of a failure of the active
lane the engine controls are switched over to the other lane automatically.
Alternate Air
In the event of power loss because of icing or blocking of the air filter, there is the
possibility of drawing air from the engine compartment. The ALTERNATE AIR operating
lever is located under the instrument panel to the right of the center console. To open
the alternate air source the lever is pulled to the rear. The alternate air source is closed
with the lever in the forward position.
BATTERY BACKUP Switch
The guarded and secured BATTERY BACKUP Switch connects the engine and
airframe electric system for restart after engine failure.
7.8.4 ENGINE INSTRUMENTS
The engine instruments are displayed on the EMU 912 iS evo and a separate fuel quantity
gauge. In addition the LANE A/B FAIL lights are located next to the LANE SELECTOR
switch. The airframe electrical system current can be monitored on a separate ammeter.
LANE A/B FAIL Lights
The lights are either illuminated, flashing or not illuminated.
When the ECU is switched on the lights are illuminated for a few seconds until the internal
test procedure is completed without faults. During that time is the ECU already functional.
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