Flight Control Systems; Control Stick; Removal Of Bearings From Control Stick, Fork And Torque Tube - Thrush Aircraft S2R–T660 Maintenance Manual

Turbo thrush

Table of Contents

requirement. The following procedures should be followed when rigging control cables.

Rigging should be accomplished in a hangar. When necessary to rig aircraft in the open, it should be

accomplished during coolest part of the day with tail of the aircraft pointing toward sun. If aircraft is moved

into a hangar for rigging, allow 90 minutes for control cables to adjust to hangar temperature.

The ailerons, elevators, and rudder are all balanced control surfaces and their static balance must be

checked in accordance with the limits show in table 7-19 after repaint or repair.

CONTROL STICK

The control stick, which is supported by bushings and bearings, is attached to the torque tube located on top

of the cockpit floor. A series of push tubes, push rods and bellcranks from solid connections between the

control stick and the ailerons. The control stick activates the elevators through push tubes, bellcrank, idler

and elevator horns. The control stick forks and torque tube may be removed for replacement of bearings

and bushings.

REMOVAL OF BEARINGS FROM CONTROL STICK, FORK AND TORQUE TUBE

Remove the control stick dust cover base assembly and the side skins under the cockpit. Use the following

procedures to replace the bearings.

Disconnect the aileron push rods and elevator push tube.

Remove the attaching hardware securing the control stick fork to the torque tube.

Withdraw controls stick and fork from aircraft.

Remove the bolts securing the torque tube to the pillow blocks. (See Figure 7-1)

Remove the torque-tube from aircraft.

INSTALLATION OF BEARINGS IN THE CONTROL STICK FORK AND ON THE TORQUE TUBE

Install bearings on the torque tube and in the control stick forks as required.

Install torque-tube in the pillow blocks.

Tighten pillow block hardware per torque values in Section II.

Install control sticks fork on torque tube and tighten hardware per torque values in Section II.

Check freedom of movement on control stick and torque tube.

Lubricate bearings per Section II of this manual.

Connect the elevator push-tube and aileron push-rods and check for proper operation of

control system.

Replace control stick dust cover base assembly and aircraft side skins.

7 - 3

THRUSH AIRCRAFT INC - T660 TURBO THRUSH

AIRCRAFT MAINTENANCE MANUAL

*** WARNING ***

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.