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 TM 55-1510-218-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
(10) If the terrain band shifts
in step 8 to the left
around the second range
marks, decrease tilt 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 degrees below
that noted in step 5.
(11) If the differences between
steps 10 and 5 or steps 9
and 5 are greater than two
degrees, recalibrate roll
stabilization circuitry to
the gyro using the follow-
ing procedure:
(a) Reset the TILT con-
trol under the flight
conditions of step 5
with stab on. Then
roll the aircraft 20
right.
(b) If the pattern shifts to
the right around the
second range mark.
slowly adjust the
ROLL TRIM potenti-
ometer until the ter-
rain band is displayed
throughout the third
range marks. Usually
a clockwise adjust-
ment is required.
4-42
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