Diamond Aircraft DA 40 NG, Airplane Flight Manual

Page: 284 / 326

Airplane
Description
DA 40 NG AFM
Page 7 - 24 Rev. 3 01-Jul-2014 Doc. # 6.01.15-E
ECU TEST
POWER lever at IDLE:
By pushing and holding the button until the end of the procedure, the self-test of each
engine control unit is started. The procedure is possible on the ground only. Otherwise
the test will not start. During the procedure the ECU performs a switch from ECU A
to ECU B or ECU B to ECU A, whichever is active at the moment, with the propeller
cycling. The propeller RPM is monitored automatically by the ECU. When switching
from one ECU to the other, a slight shake of the engine may occur. Finally the ECU
switches back. After that both caution lights must extinguish and the engine must run
without a change.
Alternate Air
In the event of power loss because of icing or blockage 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 on the left side 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 being in the forward position.
Placard on the lever, forward position:
ALTERNATE AIR
Placard on the lever, visible when lever is in the rearward position (alternate air open):
ALTERNATE AIR
ON