THRUSH AIRCRAFT, INC – MODEL S2R-R1340
AIRCRAFT MAINTENANCE MANUAL
7-4
Effective: 01/01/08
accordance with the limits show in table
7-3 after repaint or repair.
Failure to stay within control
surfaces static balance limits
could lead to control surface
flutter, which could lead to
loss of aircraft, life, and/or
property.
AILERON CONTROL SYSTEM
CONTROL STICK
Ref. Figure 7-1
The control stick is attached to the torque
tube with bushings and bearings so it
can move fore and aft relative to the
torque tube. The torque tube is attached
to the cockpit floor through bearings so
that it can rotate about the aircraft
longitudinal axis. The control stick fork
thus moves with two degrees of freedom.
A series of push rods, push tubes and
bell cranks form solid connections
between the control stick and the
ailerons. The control stick activates the
elevators through push tubes, a bell
crank, an idler and the elevator horn.
The control stick forks and torque tube
may be removed for replacement of
bearings and bushings.
Control Stick, Fork and Torque Tube
Removal
Remove the external side skins at the
cockpit and the control stick dust cover
base assembly. Use the following
procedure to replace the bearings.
A. Disconnect the aileron push rods
and elevator push tube.
B. Remove the attaching hardware
securing the control stick fork to the
torque tube.
C. Withdraw controls stick and fork from
aircraft.
D. Remove the bolts securing the
torque tube to the pillow blocks. (See
Figure 7-1)
E.
Remove the torque-tube from
aircraft.
Control Stick, Fork and Torque Tube
Installation
A. Install bearings on the torque tube
and in the control stick forks as
required.
B. Install torque-tube in the pillow
blocks.
C. Tighten pillow block hardware per
torque values in Section 2.
D. Install control sticks fork on torque
tube and tighten hardware per torque
values in Section 2.
E. Check freedom of movement on
control stick and torque tube.
F. Lubricate bearings per Section 2 of
this manual.
G. Connect the elevator push-tube and
aileron push-rods and check for
proper operation of control system.
H. Replace control stick dust cover
base assembly and aircraft side
skins.
AILERON CONTROL LINKAGE
Ref. Figure 7-1
The aileron control is driven by a single
push rod from the control stick torque
tube to a vertical bell crank at the right
side of the fuselage. A short push rod
connects the bell crank to a vertical idler
in the left side of the fuselage. In each
wing, the inboard push tubes connect
between the bell crank and idler in the
fuselage to the aft side of a bell crank
near the inboard end of the aileron.
From the forward side of this bell crank,
the outboard push tube connects to the
forward arm of the drive bell crank
located at the aileron mid span. The
short arm of the drive bell crank is
connected to a push rod that drives the
aileron. The ailerons are also connected
WARNING!
