A YAW DAMPER COUPLER, FOR USE ON BOEING 737 CIVIL AIRCRAFT. THE YAW DAMPER COUPLER PROVIDES RUDDER DEFLECTION COMMANDS TO COMPENSATE FOR MOVEMENT ABOUT THE YAW AXIS. THE YAW DAMPER COUPLER IS A RACK ASSEMBLY CONTAINING SOLID STATE SUBASSEMBLIES FOR YAW COMPUTATION, BITE AND POWER SUPPLY AND A RATE SENSOR WITH YAW BITE PANEL SUB ASSEMBLY. THE FRONT PANEL OF THE COUPLER CONTAINS TWO LIGHTS (FAIL,PASS), A GO PUSHBUTTON, A LAMP TEST PUSHBUTTON, A 2-POSITION BITE TOGGLE SWITCH, AND A SEVEN SEGMENT BITE TEST NUMBER DISPLAY. BITE IS ARMED WITH A TOGGLE SWITCH. THE GO PUSHBUTTON IS USED TO START EACH OF THE EIGHT BITE TESTS.

CLASSIFICATION HAS BEEN DETERMINED IN ACCORDANCE WITH THE FOLLOWING:- GENERAL INTERPRETATIVE RULES (GIR)S GIR 1 HAS BEEN USED TO CLASSIFY THIS PRODUCT BY THE TERMS OF HEADING 9014 - DIRECTION FINDING COMPASSES; OTHER NAVIGATIONAL INSTRUMENTS AND APPLIANCES GIR 6 HAS BEEN USED TO CLASSIFY THE GOODS TO SUBHEADING LEVEL 901490 - PARTS AND ACCESSORIES ALSO CLASSIFIED IN ACCORDANCE WITH NOTE 2(b) TO CHAPTER 90 HARMONIZED SYSTEM EXPLANATORY NOTES (HSEN) (II) (C) (7) TO HEADING 9014 ECJ C173/08 REFERS