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 TM 55-1510-218-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
AVIONICS FLIGHT CHECKS (CONT)
NOTE
The pitch and roll output levels from the
vertical gyro are governed by the 115 volt,
400 Hz excitation and, the linearity of the
gyro, plus the ability of the gyro to follow
the motion of the aircraft. The accuracy con-
tributed by the antenna is its ability to re-
spond to the gyro outputs. As a result of
these factors, the stabilization system accu-
racy can vary up to 10% of the pitch or roll
angle of the aircraft.
(1) Fly to an altitude above
10,000 feet.
(2) MODE switches - WX.
(3) RANGE switches - 120 or
60.
(4) STAB Off switch - Push
on.
(5) While flying level (0
pitch, 0 roll), adjust
TILT control to obtain a
video pattern throughout
the upper range marks.
Note TILT control set-
ting. If the inner ring of
video is not parallel to the
range mark, the error is
caused by mechanical dis-
placement of the antenna
about the roll axis of the
aircraft. Use TILT control
to determine exact error.
Correct on ground, if nec-
4-40
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