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Feathering is only possible at propeller speeds above 1300 RPM.
CAUTION
If the engine is shut down below an RPM of 1300 the propeller pitch remains below the start lock position. In this case the speed must be increased to increase the propeller RPM.
Unfeathering:
To unfeather the propeller, the associated engine master switch must be set to ON. This will open the electric valve at the pressure accumulator. The pressure stored in the accumulator will move the propeller blades into a low pitch position. As soon as the propeller starts turning and the gearbox oil operates, the accumulator will be refilled.
Ground operation:
CAUTION
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
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本文链接地址：钻石40系列飞机维护手册 DA 40 SERIES AIRPLANE MAINTENANCE MANUAL 4(21)
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