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 TM 55-1510-218-MTF
TROUBLESHOOTING
PROCEDURE
REFERENCE
essary, before further in-
flight calibration.
Push off the STAB OFF
(6)
button to restore stabiliza-
tion.
Pattern observed in step
(7)
5 should not change. If
the pattern shifts either
left or right around the
second range marks,
ground check Ieveling of
the gyro and accuracy of
the horizon indicator. USe
TILT control to find exact
error.
Roll the aircraft 20 right.
(8)
For perfect stabilization.
the terrain band should be
displayed throughout the
third range marks.
If the terrain band shifts
(9)
to the right around the
second range marks, in-
crease lilt angle using
TILT control until pattern
is displayed throughout
the third range marks.
Note new position of
TILT control. It should
not be more than two de-
grees above that noted in
step 5).
4-41
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