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Operation on the ground at high RPM should be avoided as far as possible, as the blades could suffer stone damage. For this reason a suitable site for engine runs should be selected, where there are no loose stones or similar items.
WARNING
Never move the propeller by hand.
7.9.3 OPERATING CONTROLS
Power lever
Engine performance is controlled by a power lever for each engine. Both power levers are situated on the large center console. 'Front' and 'rear' are defined in relation to the direction of flight.
Each power lever is used to set the desired engine power LOAD (%)
Lever forward (MAX) = Full power
Lever to rear (IDLE) = Idle
A separate ECU for each engine controls manifold pressure, injected fuel quantity and propeller speed according to the desired engine power preselected with the power lever. If the power lever is in a low power position - as for a landing approach - while the landing ' gear is retracted, an aural warning alerts the pilot to the retracted landing gear. If installed
' a CHECK GEAR caution is indicated on the PFD additionally.
A propeller governor, which is controlled by the ECU, is flanged onto the front of each engine. The propeller governor oil circuit is supplied with oil by the gearbox oil pump (also see Section 7.9.2 - PROPELLER). A loss of oil pressure leads to a feathering of the propeller blades, thus allowing continuation of the flight according to 3.9.3 - DEFECTIVE PROPELLER RPM REGULATING SYSTEM.
CAUTION
Following governor failure the RPM should be adjusted using the power lever. Every effort should be made not to exceed 2300 RPM.
Page 7 - 28 Rev. 5 15-Nov-2007 Doc. No. 7.01.05-E
CAUTION
The power lever should be moved slowly, in order to avoid over-speeding and excessively rapid RPM changes. The light wooden propeller blades produce more rapid RPM changes than metal blades.
WARNING
It is possible that the propeller blades remain in the position of highest pitch in case of a malfunction of the engine control unit. In this case the reduced engine performance should be taken into consideration.
ELECT. MASTER
The electric master switch has two positions:
OFF disconnecting battery power
ON connecting battery power to the power distribution system
ENGINE MASTER
Each engine can only be cranked with its ENGINE MASTER switched to ON. When activated, the ENGINE MASTER provides the power supply for the preheat system, the unfeathering accumulator valve and the engine itself. To shut down the engine the appropriate ENGINE MASTER is switched to OFF.
START
Turning START key switch to the left starts the LH engine. Turning it to the right side starts the RH engine.
ECU SWAP
There are two ECU SWAP switches, one for each engine. For normal operation both switches are set to AUTOMATIC. Each engine is controlled by its ECU A. In case of a failure of the active engine control unit (ECU) there should be an automatic switch-over to the appropriate 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.
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