BendixKing IN-862A System RDR-2100 - Manual (Page 19)

AUTOMATIC RANGE LIMITING (ARL)
The RDR 2100 contains Automatic Range Limiting (ARL) circuitry which
causes the display to depict areas that the radar cannot penetrate due to
signal attenuation. Typically, the ARL display will show blue areas on the
far side of a series of severe weather systems. This cautions the pilot to
avoid flight into the blue areas due to the uncertainty of weather condi-
tions.
Note: Radar shadows are shown in blue when ARL is active. NEVER
FLY INTO ARL BLUE RETURN AREAS.
Effective Date: 9/98 RDR 2100 Pilot's Guide: Rev 1
15
Theory of Operation
RDR 2100 PG 3/12/07 3:45 PM Page 15