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Each flap control horn is attached to the flap part with 3 screws.
The flaps are driven by an electric motor and have 3 settings:
-Cruise (UP), totally retracted
-Approach (APP), and
-Landing (LDG).
Doc. No. 7.01.05-E Rev. 5 15-Nov-2007 Page 7 - 5
The flaps are operated by means of a 3-position flap selector switch on the instrument panel. The positions of the switch correspond to the positions of the flaps, the Cruise position of the switch being at the top. If the switch is moved to another position, the flaps continue to travel automatically until they have reached the position selected on the switch. The UP and LDG positions are additionally protected by a limit switch to guard against over-running the end positions.
The electrical flap drive has an automatic circuit breaker which can also be operated manually.
Flap position indicator:
The current flap position is indicated by means of three lights beside the flap selector switch.
When the upper light (green) is illuminated, the flaps are in the Cruise position (UP);
when the center light (white) is illuminated, the flaps are in Approach position (APP);
when the lower light (white) is illuminated, the flaps are in Landing position (LDG).
When two lights are illuminated simultaneously, the flaps are between the two indicated positions. This is the case only when the flaps are in transition.
Elevator
Construction: GFRP sandwich.
Hinges: 5 hinges.
Operation: Steel pushrods;
Two of the bellcrank bearings are accessible for visual inspection next to the lower hinge of the rudder. The elevator horn and its bearing, as well as the connection to the pushrod, can be visually inspected at the upper end of the rudder.
Variable elevator stop:
The DA 42 is equipped with an electrically operated actuator that limits the elevator-up travel to 13° as soon as the power setting of both engines exceeds approximately 20 % (approach power setting) and the flap selector switch is set to LDG. This is 2.5° less than the 15.5° full deflection.
The linear actuator acts as a movable stop and is controlled by three switches, one for each power lever and one for the flap selector. When the power of one engine is reduced below approximately 20 %, or the flap selector is not in the LDG position, full elevator deflection is regained.
An amber annunciation (CAUTION) on the G1000 display is provided to inform the pilot in case a malfunction occurs. The annunciation illuminates when the variable stop should be in place and is actually not activated (power on condition) or should be retracted and actually limits the elevator travel (power off condition).
Rudder
Construction: GFRP sandwich.
Hinges: Upper hinge: One bolt.
Lower hinge: Bearing bracket including rudder stops, held by 4 screws to the rear web of the vertical stabilizer. The mating part on the rudder is a bracket which is attached to the rudder by 2 bolts. The bolts and nuts are accessible to visual inspection.
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