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PRIMUS
r
880
Digital
W
eather
Radar
System
A28-1146-102-00
Radar Facts
5-24
In prolonged turns, gyro precession can occur that is tracked by the
stabilization system and appears as undesirable ground targets on the
indicator. For example, a 1° precession error (which would probably not
be noticed on the gyro horizon) moves the antenna beam
approximately 10,500 feet at a point 100 NM from the aircraft, If ground
targets between 50 and 80 NM depending on aircraft altitude and the
actual setting of the tilt control.
10
5
15
20
AD-17723-R1@
GMAP
Roll Stabilization Inoperative
Figure 5-22