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The bellcrank must be at 90° to the vertical
stabilizer lower rib.
WARNING: IF YOU DO AN ADJUSTMENT OF A CONTROL ROD, YOU MUST
MAKE SURE THAT THE CONTROL ROD IS STILL IN SAFETY. IF
YOU DO NOT DO THIS, THE CONTROL ROD CAN DISCONNECT.
THIS CAN CAUSE DEATH OR INJURY TO PERSONS.
(4) If necessary, adjust the length of the elevator
control rods.
− Release the bolts that hold the elevator
control rods to the torque tube assembly
and the bellcrank.
− Adjust the length of the control rods.
− Install the bolts that hold the elevator
control rods to the torque tube assembly
and the bellcrank..
Use a piece of safety lock wire to make
sure the elevator control rods that you
have adjusted are still safe.
Torque to 6.5 Nm (4.6 ft.lb).
(5) Do a check of the elevator control rod from
the bellcrank at the bottom of the vertical
stabilizer to the elevator.
The elevator must be in the neutral
position.
(6) If necessary, adjust the length of the elevator
control rod.
− Release the bolt that holds the elevator
control rod to the bellcrank at the bottom
of the vertical stabilizer.
− Adjust the length of the control rod.
− Install the bolt that holds the elevator
control rod to the bellcrank at the bottom
of the vertical stabilizer.
Use a piece of safety lock wire to make
sure the elevator control rods that you
have adjusted are still safe.
Torque to 6.5 Nm (4.6 ft.lb).
DA20-C1 AMM
Flight Controls
Doc # DA201-C1
Rev. 9 27-31-00 Page 1
29 Apr 2004
CHAPTER 27-31
FLIGHT CONTROLS - ELEVATOR TRIM
1. General
The DA20-C1 has an elevator with an electrically-operated trim system. This lets you trim the
airplane for different center of gravity positions. A switch on the center console controls the elevator
trim. An indicator tells the pilot the trim position. An electric actuator moves a spring system.
Alternatively, aircraft may be fitted with control stick mounted trim switches.
Control stick mounted trim switches are located on top of each Control Stick, aft of centre. The
switches are positioned so that they can be easily operated by thumb. Forward movement of either
switch gives nose down trimming and aft movement of the switch gives nose up trim. The trim
switches control electrical relays that supply electrical power to the electric pitch trim motor. If the
switches are operated in opposing directions at the same time the trim motor will not operate.
Operation of the trim switches in the same direction and at the same time will cause the trim motor
to operate in that direction.
Flight Controls
DA20-C1 AMM
Page 2
24 Mar 1999 27-31-00 Doc # DA201-C1
Rev. 1
Figure 1: Elevator Trim Controls
DA20-C1 AMM
Flight Controls
Doc # DA201-C1
Rev. 9 27-31-00 Page 3
29 Apr 2004
2. Description
Figure 1 shows the elevator trim control system. The trim control system has these parts:
− A 3-position rocker-switch is located in the center console or the switches are located on
each of the control sticks depending on aircraft configuration. The switch (s) is spring-loaded
to the middle (off) position.
− A trim indicator located on the instrument panel. The indicator has a vertical row of lightemitting
diodes.
− A spring-mount assembly which attaches to the vertical control rod for the elevator. The
spring-mount assembly has 2 springs. The vertical control rod goes through the bore of the
springs. The top of the top spring (and the bottom of the bottom spring) have mounts. Roll
pins attach the mounts to the vertical control rod. A spacer bush between the springs has a
groove for the fork assembly on the trim actuator.
− An electrical trim actuator. Two brackets attach the trim actuator to the aft face of the spar in
the vertical stabilizer. A snubber attaches to the output rod of the trim actuator. A fork
assembly on the snubber engages with the spring-mount on the vertical control rod for the
elevator.
The trim system used on the DA20-C1 is not adjustable.
Flight Controls
DA20-C1 AMM
Page 4
19 Dec 1997 27-31-00 Doc # DA201-C1
Rev. 0
3. Operation
If you push the front part of the rocker switch with no load on the control column, these things
happen:
− The actuator moves the fork assembly upwards.
− The fork assembly moves the spring-mount upwards. This compresses the top spring. It
also extends the bottom spring. This gives an upwards force on the rod.
− The vertical control rod will move upwards until the 2 springs are equally compressed.
　
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