AVIONICS FLIGHT CHECKS (CONT)
(8) Data selector - Set to DIS/ TIME.
(9) Keys 7 and 9 - Depress simultaneously. Compare distance to TACAN station shown in the left-
hand display with the distance shown on the INS TACAN range display.
Mission control panel Check that TACAN UP- DATE annunciator light is illuminated.
Data selector -. Return INS to normal by setting to any position except WYPT or
Ground track angle and ground speed - Check as follows:
(1) Data selector - TK/GS.
(2) Left-hand display - Read correct ground track angle to the nearest tenth of a degree. Compare
with course deviation indicator.
(3) Right-hand display - Read correct ground speed to the nearest knot. Compare with airspeed
Heading and drift angle -Check as follows: