TM 55-1510-220-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
(1) Data selector - HDG/DA.
(2) Left-hand display - Read true aircraft heading to the nearest tenth of a degree. Compare with
course deviation indicator.
(3) Right-hand display - Read aircraft drift angle to the nearest degree.
(4) Keys 3 and 9 - Depress simultaneously and hold.
(5) Left-hand display - Read magnetic heading to the nearest tenth of a degree. Compare with
course deviation indicator. (Drift angle will continue to be displayed in the righthand display.)
(6) Keys 3 and 9 - Release. Left-hand display will revert to displaying true heading.
e.
Cross track distance and track angle error - Check as follows:
(1) Data selector - XTK/ TKE.
(2) Left-hand display - Read cross track distance to the nearest nautical mile.
(3) Right-hand display - Read track angle error to the nearest degree.
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