TM106601_(7/01) 2-
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2.7.4 Antenna Checkout Aids
2.7.4.1 Tilt Check Procedure
(a) Rotate the Function Select Switch on the Radar Control Panel to STBY.
(b) Place the aircraft vertical gyro to zero degrees pitch and zero degrees roll.
(c) Set the TILT control on the Radar Control Panel to position the antenna at 0°. The antenna
elevation position should be 0°
±
1°.
(d) Set the TILT control to position the antenna to the 10° up. The antenna elevation position should
be +10°
±
3°.
(e) Set the TILT control to position the antenna at the 10° down reference mark. The antenna
elevation position should be -10°
±
3°.
2.7.4.2 Pitch Calibration Check Procedure
(a) With the Function Select Switch on the Radar Control Panel in STBY position, manually position
the antenna to zero degrees azimuth and insert the retaining pin into the 0° slot to lock the
antenna in azimuth.
(b) Adjust the TILT control on the Radar Control Panel to position the antenna exactly at zero
degrees in elevation.
Note
+
Do not make further adjustments to the TILT
control until pitch and roll calibration is
completed.
(c) Position the aircraft vertical gyro for 10° nose up and zero degrees bank. The antenna elevation
position should be 10° down. If not, adjust the PITCH gain potentiometer on the antenna drive
assembly for proper deflection.
(d) Position the aircraft vertical gyro for 10° nose down and zero degrees bank. The antenna
elevation position should be 10°
±
1.5° up.
(e) Momentarily (10 seconds maximum) rotate the function switch to the TEST position on the
radar indicator. The antenna should return to 0° elevation position. Return the function switch
to the STBY position.
