TM 55-1510-215-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
(5) While flying level (0°
K40
pitch, 0° roll), adjust TILT control to obtain
a video pattern throughout the upper
range marks. Note TILT control setting.
If the inner ring of video is not parallel to
the range mark, the error is caused by
mechanical displacement of the antenna
about the roll axis of the aircraft. Use TILT
control to determine exact error. Correct
on ground, if necessary, before further
in-flight calibration.
(6)
Push off the STAB OFF button to restore
stabilization.
(7)
Pattern observed in step (5) should not
change. If the pattern shifts either left or
right around the second range marks,
ground check leveling of the gyro and
accuracy of the horizon indicator. Use
TILT control to find exact error.
(8)
Roll the aircraft 20° right. For perfect
stabilization, the terrain band should be
displayed throughout the third range
marks.
2-65
