TM106601_(7/01) 2-
10
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2.7.3 Antenna Stabilization Check
Note
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The following tests require accurate
positioning of the vertical gyro in both pitch
and roll. If a tilt table is not available, the gyro
may be positioned by reference to the flight
director or artificial horizon, or some other
method of accurately tilting the gyro in the
aircraft. See Figure 2.7-1 for location of
antenna checkout aids. This calibration
procedure should be performed after any
period of gyro or antenna maintenance.
Note
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When the RDR-1600 weather radar system is
being calibrated to the aircraft’s gyros, the
antenna scan, in the azimuth axis, must be
stopped, but the stabilization must be enabled.
When the RDR-1600 weather radar system is in
Standby mode, the antenna will stop scanning.
When the RT-1601 is configured as a NC-104B-
1005, stabilization will be allowed in the Standby
mode (Stab Disable pin from the DA-1203A - Pin
A is high). Whereas, when the RT-1601 is
configured as a NC-104B-1004, stabilization will
not be allowed in the Standby mode (Stab Disable
pin from the DA-1203A - Pin A is grounded).
This creates a problem if calibrated to the gyros
when the RT-1601 is configured as a NC-104B-
1004. If the unit is in Standby mode, the antenna
is not scanning, but the stabilization is off. If the
unit is turned to Test mode the stabilization is
enabled, but the antenna is scanning.
To calibrate the gyros when the RT-1601 is
configured as a NC-104B-1004, the following
steps shall be performed. Disconnect the Stab
Disable pin from the DA-1203A (Pin A). Place
the unit in Standby mode, and then follow the
instructions listed below. Reconnect the Stab
Disable pin to the DA-1203A (Pin A) when
finished.
