Diamond Aircraft DV 20 E 2022, Airplane Maintenance Manual

Page: 327 / 903

AIRCRAFT
DV 20 E AMM Flight Controls
Doc # 4.02.25
Rev. 2
27-00-00
Page 1
15 Mar 2022
CHAPTER 27
FLIGHT CONTROLS
1. General
This chapter describes about the operation and the adjustment of the flight controls. It also describes
about the assembly of the flight controls. Refer to the related section for the data on a specified
system.
This chapter describes how standard parts are used to make the flight controls for each system.
2. Description
The DV 20 E airplane has the usual flight controls. An elevator attached to the horizontal stabilizer
gives longitudinal control. Ailerons attached to the trailing edge of each wing give lateral control. The
rudder attached to the Vertical Stabilizer gives yaw control. Flaps attached to the trailing edge of each
wing give extra lift for landing and for take-off.
The DV 20 E airplane has a control stick for each pilot. The pilot can set the elevator trim with a control
switch in the control stick.
Each pilot has a rudder pedal assembly. The assembly attaches to the cockpit floor. The pilot can
adjust the position of the rudder pedals with a T-grip selector on the rudder pedal assembly.
The pilot moves each primary control through a system of control rods and bellcranks. Cables operate
the rudder. An electric actuator operates the flaps.
3. Control Rods
The control rods used in the DV 20 E airplane have standard end fittings. Also most rods use a
standard diameter tube. Only the length of the rods is special.
Figure 1 shows an example of a standard control rod. The rod has adjustable end fittings. Each end
fitting has an eye end with a threaded shaft. The eye end has a bearing. A lock nut on the threaded
shaft locks the eye end in position. You can turn the eye end to adjust the length of the rod.
A steel tube connects the end fittings. Threaded inserts are welded into position in the end of each
steel tube. A safety hole is drilled in each end of the steel tube. The safety hole shows you if the
installation of the eye end to the insert in the steel tube is correct. If you can push the safety wire
through the hole to the other side, the eye end installation is not correct. If you cannot push the safety
wire through the hole, the eye end installation is correct.