TM 55-1510-219-MTF
PROCEDURE TROUBLESHOOTING REFERENCE
d. Heading and drift angle -
Check as follows:
(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 right-hand 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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