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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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Altitude
TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
G. AVIONICS FLIGHT CHECKS (CONT)
(7) Verify  that  pattern  does  not
change. If the pattern shifts either
left or right, 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 will be displayed throughout
the third range marks.
(9) If the terrain band shifts to the right
around the second range marks,
increase  tilt  angle  using  TILT
control until pattern is displayed
throughout the third range marks.
Note new position of TILT control.
Tilt will not be more than two
degrees above that noted in step
(5).
(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. Verify that tilt is no
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
4-24

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