Elevator Bellcrank/Lever Remove/Install Access References
Idler lever at the front main bulkhead. Pilots’ seats. Refer to Section 25-10.
Bellcrank at the vertical stabilizer rear web. Rudder. Refer to Section 27-20.
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Section 27-38
Flight Controls - Elevator Trim
1. General
The DA 40 has an elevator with a trim tab. The trim tab is mechanically operated. This lets you trim the airplane for different speeds and center-of-gravity positions.
A handwheel on the center console controls the elevator trim. An indicator tells the pilot the trim setting. A flexible cable moves the trim tab.
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AIRCRAFT
Handwheel
Right Cover Plate
Left Cover Plate
Flexible Cable
Frame Assembly
Right Frame TRIM HANDWHEEL ASSEMBLY Lock Nut
Plain Washer
Spring Washers
Lock Washer
Trim Gear Assembly Spring Washers Trim Indicator Mark
Plastic Friction Washers
Plastic Friction Washers
Distance Bush
Gear Segment with
Internal Teeth
Ball Stud
Bushes
Left Frame HANDWHEEL AND TRIM INDICATOR INSTALLATION Pivot Bolt
Figure 1: Elevator Trim Mechanism in the Cockpit
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2. Description
The trim installation has 3 main parts:
) A handwheel assembly with a trim indicator.
) A flexible cable which connects the handwheel to the trim tab.
) The trim tab actuator assembly.
Figure 1 shows the elevator trim mechanism in the cockpit. Figure 2 shows the trim tab actuator assembly.
A. Trim Handwheel Assembly
A handwheel assembly on the center console controls the elevator trim system. The assembly has a metal mounting frame. The frame attaches to the rear of the engine control assembly and the top of the control bulkhead.
A long bolt through the mounting frame carries the handwheel. The bolt also holds friction disks, plain washers and spring washers against the handwheel. Two jam-nuts let you adjust the friction.
A small gear wheel attaches to the handwheel. The small gear wheel engages with a large gear segment with internal teeth. The gear segment has a pivot bolt at the bottom of the mounting frame. A ball-stud attaches the eye-end of a long flexible cable to the gear segment. An extension to the mounting frame to the rear makes the anchor point for the outer sheath of the cable.
The gear segment is also the trim indicator. The top face of the segment has a white line across it mid way between the front and back. The top face can be seen through a slot in the cover plate. The sides of the cover plate have markings to show the trim position.
B. Flexible Cable
A long flexible cable connects the trim handwheel assembly to the trim tab. The cable goes through holes in the front and rear main bulkheads, the baggage frame and each of the ring frames. It goes up the front face of the front web of the vertical stabilizer and through a slot near the top. It goes through a large hole at the top of the rear web of the vertical stabilizer to the trim tab actuator assembly.
The cable has an inner core with threaded end fittings. Spherical end fittings at each end connect to the gear segment and trim tab actuator assembly.
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