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ECU SWAP
For normal operation this switch is set to AUTOMATIC. The engine is controlled by ECU
A. In case of a failure of the active engine control unit (ECU) there should be an automatic switch-over to the ECU B. If the automatic switch-over fails, switch-over can be done manually by switching to ECU B. This procedure should only be applied in an emergency.
Doc. No. 6.01.05-E Revision 3 26-May-2003 Page 7 - 23
ECU TEST
By pushing and holding the button until the end of the procedure, the self-test of the engine control unit is started. The procedure is possible on the ground as well as during flight, but only if the power lever is in the IDLE position. Otherwise the test will not start. During the procedure the ECU performs a switch from ECU A to ECU B 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 from ECU B to ECU A. After that both caution lights must extinguish and the engine must run without a change.
' In addition, the 'ECU Test'-button is used in IFR equipped airplanes to test the ECU ' Backup Battery for proper charge. This test must be passed prior to each flight. The test ' is possible on ground as well as during flight, but only if the ECU Backup Battery is not ' in use. Otherwise the test will not start. During the test, a battery tester, installed in the ' instrument panel, measures several parameters of the ECU Backup Battery. This will ' be indicated with a red LED flashing, installed on the left hand side of the instrument ' panel. If the capacity of the ECU Backup Battery has been found to be less than 70% ' of its rated capacity the 'ECU BACKUP UNSAFE'- light is on continuously.
Doc. No. 6.01.05-E Revision 3 26-May-2003 Page 7 - 24
Alternate Air
In the event of power loss because of icing or blocking of the air filter, there is the possibility of drawing air fromthe engine compartment. The ALTERNATE AIR operating lever is located under the instrument panel to the left of the center console. To open the alternate air source the lever is pulled to the rear. Normally, the alternate air source is closed, with the lever 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
ON
Doc. No. 6.01.05-E Revision 3 26-May-2003 Page 7 - 25
7.9.3 PROPELLER
An mt-Propeller MTV-6-A/187-129 hydraulically regulated 3-bladed constant speed propeller is installed. It has wood-composite blades with fiber-reinforced plastic coating and stainless steel edge cladding; in the region of the propeller hub the leading edge is coated with adhesive PU foil. These blades combine the lowest weight whilst minimizing vibration.
Propeller control
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