PurposeUSED IN CONJUNCTION WITH FUNCTIONAL TEST STANDS TO INTERFACE WITH X-Y PLOTTER, STRIP CHART, OSCILLOSCOPE, ETC WHERE VELOCITY/POSITION MEASUREMENTS ARE REQUIREDAirplane737, 747, 757, 777-200, 777-200ER, 777-200LR, 777-300, 777-300ER, 777-8, 777-9, 777FUsage CodeOVERHAUL 