Extra 300LT, Maintenance Manual

Page: 210 / 551

CHAPTER 27
PAGE 25 PAGE DATE: 21. March 2014
MAINTENANCE MANUAL EXTRA 300LT
27-30-00 ELEVATOR CONTROL
Refer to Figure 17. The two control sticks (1, 4) are con-
nected by a push-pull rod (3) inside the torque tube (2). The
control movements are transferred from the rear control
stick (2) to the elevator (11) by push-pull rods (3), bellcranks
(13, 14) and the elevator actuator arm (12). The bellcranks
have two sealed ball bearings. The elevator is mounted at five
points in spherical bearings pressed into aluminium hinge
arms. For lightning protection reasons each hinge arm is
grounded to the corresponding attachment bracket at the
elevator by bonding leads. The travel stops (15) are located
at the torque tube.
Mass balance weights (9) are mounted on the elevator tips
extending into the horizontal stabilizer when the elevator is
in neutral or downward position.An additional optional mass
balance weight (9a) can be installed on the elevator actuator
arm.
An access panel is located at the right side of the rear
fuselage.
Trim Tab
Pitch trim is done by means of the trim tab (10) on the right
elevator trailing edge which is mounted by two piano hinges.
It is operated by a trim servo (7) with rod (6), a trim lever (5)
and a bowden cable mechanism (8).
Refer to Chapter 20 for general information about handling
of control cables.
The elevator trim control switch is located on the control
stick and the trim position indicator on the rear instrument
panel.
The trim tab is not mass balanced.