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) The flap motor turns the reduction gear and spindle. This moves the push-rod towards the new set
position.
) The push-rod turns the idler lever around its axis.
) The idler lever moves the push-rods in the fuselage and the wings.
) The push-rods move the bellcranks in the left and right wing.
) The two short push-rods move the flaps.
When the flaps come to the set position:
) The cam on the flap actuator operates the related position and indication micro-switches.
) The logic circuit switches off the related transistors to de-energize the motor.
) The flap position indicator shows the new flap position.
4. Fail-Safe Operation
The flap control system has these safety properties:
) If the LDG position micro-switch fails closed the flap actuator push-rod will continue to travel for about
5 mm (0.2 in.) until it reaches an internal stop. This prevents damage to the flaps. The FLAP
circuit-breaker opens.
) If the UP position micro-switch fails closed, the actuator push-rod contacts the end of the actuator body
after about 5 mm (0.2 in.) of movement. This prevents damage to the flaps. The FLAP circuit-breaker
opens.
) If there is a mechanical failure in the controls to one flap, the torsion tube prevents asymmetric flap
movement.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 8
20 Sep 2007 27-50-00 Doc # 6.02.01
Rev. 5
Flaps
UP
T/O
LDG
UP LED
T/O LED
LDG LED
Flap Selector Switch Flap Position Indicator
FLAP CONTROL UNIT IN THE INSTRUMENT PANEL
(View Looking Forward)
MICRO-SWITCH BOARD
(View Looking Down)
UP Indication and
T/O Position Moving Down
Micro-Switch
UP Indication and
T/O Position Moving Down
Micro-Switch
LDG Indication and
T/O Position Moving Up
Micro-Switch
LDG Indication and
T/O Position Moving Up
Micro-Switch T/O Indication
Micro-Switch
UP Position
Micro-Switch
LDG Position
Micro-Switch
UP POSITION
T/O POSITION
LDG POSITION
Closed
Closed
Closed
Closed
Closed
Closed
Closed
Open
Open
Open Open
Open
Open
Open
Open
S1
S1
S1
S2
S2
S2
S4
S4
S4
S5
S5
S5
S3
S3
S3
Figure 4: Flap Electrical Control System
AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-50-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have in the flap control system. If you have the trouble detailed
in the Trouble column read across to the Possible Cause column. Then do the repair in the Repair column.
Trouble Possible Cause Repair
Flaps do not operate. Circuit breaker not set.
Airplane electrical system voltage
low.
Flap selector switch defective.
Set the flap circuit breaker.
Do a test of the airplane
electrical system voltage.
Replace the flap electronic
control unit.
Flap circuit-breaker will not
stay closed.
Short to ground in the wires to the
electrical control unit or the
micro-switches.
Short to ground in the electrical
control unit.
Short to ground in a micro-switch.
Short to ground in a wire between a
closed micro-switch and the control
unit.
Do an insulation test between
each wire and ground. Repair or
replace defective wires.
Replace the electrical control
unit.
Replace the micro-switch.
Do an insulation test between
each wire and ground. Repair or
replace defective wires.
Flap circuit-breaker opens
when flap selector switch
moved to any down
position.
Short to ground in a motor supply
wire.
Do an insulation test between
each wire and ground. Repair or
replace defective wires.
Flap circuit-breaker opens
when flap selector switch
moved to any up position.
Short to ground in a motor supply
wire.
Do an insulation test between
each wire and ground. Repair or
replace defective wires.
Flap circuit-breaker opens
when the flaps stop at the
chosen position.
Short to ground in the wires to the
electrical control unit from the related
indication micro-switch.
Do an insulation test between
each wire and ground. Repair or
replace defective wires.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Trouble Possible Cause Repair
Page 102
20 Sep 2007 27-50-00 Doc # 6.02.01
Rev. 5
Flap circuit-breaker opens
　
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