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− The elevator moves down.
− The actuator will continue to move until:
− You release the switch.
− The actuator extends fully.
If you push the rear part of the rocker switch with no load on the control column, the elevator will
move up.
The pilot can set the elevator trim so that the spring load balances the aerodynamic load on the
elevator.
The trim position indicator shows the position of the trim actuator.
DA20-C1 AMM
Flight Controls
Doc # DA201-C1
Rev. 0 27-31-00 Page 101
19 Dec 1997
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.
Complaint Possible Cause Repair
Trim system does not operate. Circuit breaker not set. Set the trim circuit breaker.
Do a test for correct trim
system operation. If the
circuit breaker opens:
− Do a short-circuit test.
− Do an electric actuator
friction test.
Trim electric actuator defective. Replace the trim electric
actuator.
Bearings defective. Replace the defective
bearings.
Open circuit in the electrical
control system.
Do a test for continuity in each
wire of the control system.
Repair/replace defective
items.
Trim switch defective. Replace the trim switch.
Elevator trim moves too slowly.
(Usual time for full travel 11
seconds)
Not enough actuator power.
Trim electric actuator defective.
Do a test for the correct
electrical power at the
actuator.
Replace the trim electric
actuator.
No (or incorrect) position
indication.
Elevator trim position indicator
out of adjustment.
Elevator trim position indicator
defective.
Trim electric actuator defective.
Adjust elevator trim position
indicator.
Replace the elevator trim
position indicator.
Replace the trim electric
actuator.
Loss of stick-centering. Trim electric actuator
disconnected.
Spring-mount assembly
defective.
Reconnect the trim electric
actuator.
Replace the spring-mount
assembly.
Flight Controls
DA20-C1 AMM
Page 102
19 Dec 1997 27-31-00 Doc # DA201-C1
Rev. 0
Intentionally left blank
DA20-C1 AMM
Flight Controls
Doc # DA201-C1
Rev. 0 27-31-00 Page 201
19 Dec 1997
MAINTENANCE PRACTICES
1. General
These maintenance practices tell you how to remove and install the elevator trim actuator. Refer to
Chapter 55-20 for data on how to remove and install the elevator.
2. Remove/Install The Elevator Trim Actuator
Refer to Figure 1.
A. Remove The Elevator Trim Actuator
Detail Steps/Work Items Key Items
(1) Disconnect the airplane battery. Refer to Chapter 24-31
(2) Remove the rudder. Refer to Chapter 55-40
WARNING: WHEN YOU DO WORK ON THE AIRPLANE CONTROLS, YOU
MUST MAKE SURE THE AREA AROUND THE
CONTROLS/CONTROL SURFACES ARE CLEAR OF
PERSONNEL/EQUIPMENT. IF YOU DO NOT DO THIS, INJURY TO
PERSONNEL AND DAMAGE TO CONTROL SURFACES CAN
OCCUR.
(3) Disconnect the bottom of the elevator
vertical control rod at the elevator bellcrank.
− Remove the nut bolt and two washers.
− Move the control rod clear of the fork
assembly.
(4) Get access through the hole in the vertical
stabilizer and cut the Tye-wrap that holds the
electrical harness of the elevator trim
actuator.
− Disconnect the electrical harness
connector.
(5) Remove the nut, bolt and three washers that
attach the elevator trim actuator to the lower
mounting bracket.
Flight Controls
DA20-C1 AMM
Page 202
19 Dec 1997 27-31-00 Doc # DA201-C1
Rev. 0
Detail Steps/Work Items Key Items
(6) Cut the locking wire from the bolt that
attaches the fork assembly to the elevator
trim actuator.
− Remove the bolt and washer.
− Remove the fork assembly.
(7) Carefully move the elevator trim actuator
down until it clears the upper mounting
bracket.
− Remove the elevator trim actuator.
B. Install The Elevator Trim Actuator
Detail Steps/Work Items Key Items
(1) Put the fork assembly in the correct position. Refer to Figure 1
(2) Carefully put the elevator trim actuator in the
upper mounting bracket.
− Make sure you align the actuator rod in
the inner fork assembly.
− Install the bolt and washer.
− Lock the bolt with wire.
　
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