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15 Cards in this Set
- Front
- Back
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Briefly describe the flight control system for the DA42.
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There are 2 central control sticks for ailerons and elevator control. The ailerons and elevator are operated via steel push rods.
The rudder is operated with cables connecting the rudder to the rudder pedals. The flaps are electrically operated with 2 sections on each wing. |
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How are the ailerons constructed?
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Using the GFRP / and CFRP sandwich method.
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Where is the aerodynamic balance located and what is it's purpose?
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It is located on the outboard bottom of the aileron. It's purpose is to aid in raising of the aileron during a turn.
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How are the flaps constructed?
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Using the GFRP / and CFRP sandwich method. Outer end of the inboard flap has a tongue that engages in a slot in the inner end of the outboard flap.
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Why are the flaps connected?
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It's a fail safe method that prevents a slip flap condition; where one flap is down, and the other is not.
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What do two lights on the flap position indicator mean?
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It means the flaps are in transition between those two phases.
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How many motors operate the flaps?
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Only one motor moves the push rods for all the flaps.
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Describe the variable elevator stop.
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It's an electronically operated linear actuator that limits the movement of the elevator from 15 degrees to 13 degrees.
It deploys when both engines exceed 20% power and the flaps are in LDG position. |
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Are their any warnings regarding the variable elevator stop?
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A caution annunciation on the G1000 is provided to inform the pilot in case a malfunction occurs. It illuminates when the stop should be in place but is not; or should be retracted but is not.
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What is the purpose of the variable elector stop?
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It's used to help stop the pilot from pitching the plane up too much on a go-around.
Pitching up too much on a go-around could stall the plane, scrape the tail, or render the plane uncontrollable (especially with one engine). |
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What type(s) of elevator trim exist on the DA42?
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There is a mechanical and an electrical trim.
The mechanical trim uses a cable from the trim wheel to the actuating level at the rear of the elevator. The electrical trim uses a servo underneath the co-pilots that connects to the trim wheel via a chain gear. |
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What happens to the trim if the autopilot fails?
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Since the electrical trim uses the autopilot servo, if the autopilot fails, you will loose electrical trim functionality.
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How many actuating levers are on the elevator trim? Describe the functionality.
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There are 2 actuators for the elevator trim. When looking at the plane from the rear:
The left actuator connects to a long flexible cable that adjusted by the pilot using the control wheel. The right actuator has a friction dampener that prevents fluttering in case of mechanical failure of the trim cable. |
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Describe how the rudder works.
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When either pilot steps on a rudder petal, it's pulls the control cable connected to the rudder via a system of cables and pulleys.
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Is it possible to break the rudder using the rudder petals?
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No, the cables would break before the rudder.
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