TM 55-1510-221-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 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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