If you move the control stick aft:
) The torque tube assembly turns.
) The short and long push-rods move forward.
) The bellcrank pulls the vertical push-rod down
) The elevator moves up.
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AIRCRAFT
DA 40 Series
Elevator Actuating Lever Large Washer Collar Bush Distance Bush
Elevator Push Rod
Rigging Pin Hole
Elevator Bellcrank
Rigging Pin Hole Ring Frame 1 Ring Frame 2
Idler Lever Baggage Frame Elevator Push Rod Idler Lever To Bellcrank
Figure 2: Elevator Controls Installation in the Rear Fuselage
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Flight Controls
AMM
Trouble-Shooting
1. General
The table below lists the defects you could have in the elevator 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
Control vibration in the air. Too much backlash in the flight controls. Examine the system to isolate the problem. Replace the defective part.
Elevator controls stiff/catch. Bearings defective. Push-rod bent. Replace the defective eye-end. Replace the push-rod.
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Flight Controls
AMM
Maintenance Practices
1. General
These maintenance practices tell you how to do test procedures on the elevator control system. And they tell you how to adjust the elevator control system. Refer to Section 55-20 to remove/install the
elevator.
WARNING: WHEN YOU DO WORK ON THE AIRPLANE CONTROLS, YOU MUST MAKE SURE THE AREAS AROUND THE CONTROLS/CONTROL SURFACES ARE CLEAR OF PERSONS/EQUIPMENT. IF YOU DO NOT DO THIS, INJURY TO PERSONS AND DAMAGE TO CONTROL SURFACES CAN OCCUR.
WARNING: WHEN YOU COMPLETE WORK ON THE CONTROLS, MAKE SURE THAT YOU REMOVE ALL LOOSE ITEMS/TOOLS FROM THAT AREA. LOOSE ITEMS/TOOLS CAN PREVENT FULL MOVEMENT OF THE AIRPLANE CONTROLS. THIS CAN CAUSE DEATH OR INJURY TO PERSONS.
2. Elevator Control System Test for Correct Range of Movement
A. Equipment
Item Quantity Part Number
Rigging pin. 1 -
Ruler or deflection gauge. 1 Commercial.
Fuselage trestle. 1 Commercial.
B. Elevator Control Test Procedure
Note: If you use a deflection gauge, make sure that the airplane does not move in pitch during the procedure. It will cause errors in the test.
Detail Steps/Work Items Key Items/References
(1) Make a copy of the Control Surfaces Adjustment Report. Refer to Section 06-00. Use it to record the measurements.
(2) If you will use a deflection gauge, put a trestle under the rear fuselage. To prevent movement in pitch.
(3) Remove the left pilot’s seat. Refer to Section 25-10.
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DA 40 Series
(4) Install the rigging pin through the stick mounting block and the torque tube. Refer to Figure 1.
Note: Use a ruler or deflection gauge to make all measurements at the elevator control surface. Make the measurement between the top surface of the trailing edge of the horizontal stabilizer and the top surface of the elevator.
(5) Make sure that the elevator aligns with the horizontal stabilizer. At the stabilizer tips.
(6) Measure the distance between the top surface of the trailing edge of the horizontal stabilizer and the top surface of the elevator. Record the distance.
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