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controls.
Examine the system isolate
the problem. Replace the
defective part.
Elevator controls stiff/catch. Bearing's defective. Replace the defective eye
end.
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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 Chapter 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
AIPLANE CONTROLS. THIS CAN CAUSE DEATH OR INJURY TO
PERSONS.
2. Elevator Control System Test For Correct Range Of Movement
A. Equipment
Items Quantity Part Number
Protractor 1 Commercial.
B. Elevator Control Test Procedure
Detail Steps/Work Items Key Items
(1) Make a copy of the Control Adjustment
Report.
− Use it to record the measurements.
Refer to Chapter 06-00.
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Detail Steps/Work Items Key Items
(2) Make sure the control stick is centered.
− Install the control stick lock.
Note: Use a protractor to make all measurements at the elevator control surface.
Make the measurement from the top surface of the horizontal stabilizer to the
top surface of the elevator.
(3) Measure the angle between the top surface
of the horizontal stabilizer and the top
surface of the elevator.
− Record the measurement.
The elevator must align with the horizontal
stabilizer.
(4) Remove the control stick lock.
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.
(5) Move the control stick fully forward and hold
it against the stop.
(6) Measure the angle between the top surface
of the horizontal stabilizer and the top
surface of the elevator.
− Record the measurement.
The elevator must be between 14° - 16°
down.
(7) Move the control stick fully aft and hold it
against the stop.
(8) Measure the angle between the top surface
of the horizontal stabilizer and the top
surface of the elevator.
− Record the measurement.
The elevator must be between
24° - 26° up.
DA20-C1 AMM
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Rev. 0 27-30-00 Page 203
19 Dec 1997
3. Elevator Control System Adjustments.
If you cannot get the correct range of movement of the elevator control system, use this procedure
to adjust the system. Gust travel refers to the amount of travel remaining at the control surface with
the control stick held against the cockpit stop.
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 PERSONNEL.
A. Equipment
Items Quantity Part Number
Protractor 1 Commercial.
Elevator leveller 1 ??
Clamp 1 Commercial.
B. Elevator Adjustment Procedure
Detail Steps/Work Items Key Items
(1) Remove these items for access:
− Pilots seats.
− Center fuselage access panels
− Rudder.
Refer to Chapters:
− 25-10
− 52-40
− 55-40
(2) Make sure the control stick is centered.
− Install the control stick lock.
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Page 204
19 Dec 1997 27-30-00 Doc # DA201-C1
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Detail Steps/Work Items Key Items
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.
(3) Do a check of the two elevator control rods
that attach between the torque tube
assembly and the bellcrank at the bottom of
the vertical stabilizer.
　
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