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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.
Clamp blocks hold the outer core to the mounting frame at the front and a bracket from the horizontal
stabilizer at the back.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 4
20 Sep 2007 27-38-00 Doc # 6.02.01
Rev. 5
TrimTab
Left Actuating lever
Right Actuating lever
Flexible Operating Cable Outer
Flexible Operating Cable Inner
Friction Damper
Elevator Stop
Trim Actuator Mounting Bracket
Friction Clamp Block
Figure 2: Trim Tab Actuator Assembly
AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-38-00 Page 5
20 Sep 2007
C. Trim Tab Actuator Assembly
The trim tab is a one-piece GFRP molding. The tab has 2 integral levers. Two cranked actuating levers
attach to the integral levers. The left cranked actuating lever connects to the long flexible cable. The
right actuating lever connects to a friction damper.
The friction damper has a clamp-block with a hole for a rod. The rod connects to the right actuating
lever on the trim tab. You can adjust the friction of the rod in the clamp block.
3. Operation
When you move the top of the trim handwheel forward, these things happen:
) The small gear wheel moves the top of the gear segment forward.
) The gear segment pulls the inner core of the flexible cable forward.
) The inner core of the flexible cable pulls the left cranked actuating lever forward.
) The left cranked actuating lever pulls the trim tab lever forward to move the tab up.
) The up movement of the trim tab pushes the elevator down in flight giving nose-down trim.
When you move the top of the handwheel aft, the gear segment moves aft, the cable moves aft and the
trim tab moves down. This pushes the elevator up and gives nose-up trim.
In each case, the pilot can see the trim position from the white mark on the gear segment.
4. Emergency Operation
In the event of failure of the trim control system between the handwheel and the trim actuator lever, the
friction damper will prevent trim tab flutter.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 6
20 Sep 2007 27-38-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-38-00 Page 101
20 Sep 2007
Trouble-Shooting
1. General
The table below lists the defects you could have in the elevator trim 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
Too much play in the trim
system.
Worn bearings or joints. Replace the defective items.
Trim handwheel stiff to move. Flexible cable damaged.
Trim damper incorrectly
adjusted.
Replace the flexible cable.
Adjust the trim damper.
AIRCRAFT
Flight Controls DA 40 Series
AMM
Page 102
20 Sep 2007 27-38-00 Doc # 6.02.01
Rev. 5
Intentionally left blank
AIRCRAFT
DA 40 Series
AMM
Flight Controls
Doc # 6.02.01
Rev. 5 27-38-00 Page 201
　
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