TM 55-1510-221-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
G. AVIONICS FLIGHT CHECKS (CONT)
screen. Complete test patterns may be seen only on
80 mile range or higher.
g.
Function switch - ON.
h.
TILT control - Move up or down to observe targets
above or below aircraft. Echo display will change in
shape and location only. Weather targets will not
change shape or location. Ground targets will not
change shape or location. Ground targets are selected
as a function of tilt.
i.
Antenna stabilization check.
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.
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