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mounting bracket on the left rear closing rib attaches the actuator to the structure.
The electric actuator has an electric motor. The motor has a reduction gear which turns a spindle. The
spindle operates a push-rod. The push-rod connects to an idler lever attached to the rear main
bulkhead.
A cam attached to the push-rod operates five micro-switches. The micro-switches are part of the flaps
electronic control circuit.
B. Push-rods and Bellcranks
The idler lever on the rear main bulkhead connects to two push-rods. The two push-rods connect to
the inboard ends of long push-rods at the wing root ribs. The long push-rods connect to the flap
bellcranks in the wings. A guide bearing holds each long rod at the root rib. Two short push-rods attach
to the flap horns.
C. Torsion Tube
A cranked torsion tube connects to the inboard end of each flap. The torsion tube has 2 parts. Bolts
attach the 2 parts of the torsion tube to each other in the fuselage.
A transfer lever attaches to the outboard end of each part of the torsion tube. The transfer lever has
2 transfer pins. The transfer pins engage with bushes in the root rib of the flap.
If there is a failure of the flap mechanical system, the torsion tube transfers movement from one flap
to the other flap. It makes sure that the flaps are synchronized.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 4
20 Sep 2007 27-50-00 Doc # 6.02.01
Rev. 5
Left Wing
Root Rib
Guide Rollers
Right Wing
Root Rib
Guide Rollers
Push Rod from
Fuselage
Push Rod from
Fuselage
Right Flap Rib
Left Flap Rib
Left Flap
Right Flap
Rigging
Pin Hole
Rigging
Pin Hole
Flap Idler Lever
in the Fuselage
Figure 2: Flap Controls in the Wing
AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-50-00 Page 5
20 Sep 2007
D. Flap Electrical Control
Figure 4 shows the flap electrical control system. The main bus or, if installed, the essential bus
supplies power for the flaps. A circuit-breaker protects the circuit (Lycoming version: 5 amps, TAE
version: 10 amps). See Chapter 92 for the wiring diagram.
The flap electrical control system uses solid-state electronics. It has an electronic control unit and a
switchboard. The electronic control unit is located on the instrument panel. The switch board attaches
to the flap actuator.
The electronic control unit has a 3-position selector switch and a flap position indicator. The selector
switch can be set to:
) UP (fully up). 0º ± 1º
) T/O (take-off). 20º ± 2º
) LDG (landing). 42º ± 1º
The flap position indicator has three light-emitting diodes. The top diode lights when the flaps are in the
UP position. The middle diode lights when the flaps are in the T/O position. The bottom diode lights
when the flaps are in the LDG position.
The switch board attaches to the body of the flap actuator. The switch board has 5 micro switches. It
also has a solid-state logic circuit board.
The logic circuits monitor the outputs from the selector switch and the micro-switches on the switch
board. They control 4 power transistors. Two of the power transistors can connect the power supply
to the flap motor. The other two can connect the motor to ground.
Two screws attach each micro-switch to the switch board. You can adjust the position of the switch
board with 3 worm-drive clamps. The micro-switches have these functions:
) Micro-switch 1 - UP position.
) Micro-switch 2 - UP indication and T/O position moving down.
) Micro-switch 3 - T/O indication.
) Micro-switch 4 - LDG position.
) Micro-switch 5 - LDG indication T/O position moving up.
Cable harnesses with multi-pin connectors connect the components.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 6
20 Sep 2007 27-50-00 Doc # 6.02.01
Rev. 5
Idler Lever
Actuator Motor
Bush
Mounting Bracket
Rear Closing Rib
Circuit Board
Base Plate
TYPICAL ATTACHMENT
OF MICRO-SWITCH
Micro-Switches
Worm-Drive Clamps
Cam
Micro-Switch Base Plate
Micro-Switch
Cam
Cam Adjusting Nuts
Actuator Control Rod
Actuator
Swivel
Block
Figure 3: Flap Actuator Installation
AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-50-00 Page 7
20 Sep 2007
3. Operation
If you operate the flap selector switch these things happen:
) The switch energizes the related logic circuit.
) The logic circuit switches on the related transistors to supply power/ground to the flap motor.
　
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