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PRIMUS
r
880 Digital Weather Radar System
A28--1146--102--03
REV 3
Operating Controls
3-8
The radar antenna is normally attitude stabilized. It automatically
compensates for roll and pitch maneuvers (refer to Section 5, Radar
Facts, for a description of stabilization). The STB OFF annunciator is
displayed on the screen.
6 TRB (Turbulence)
The TRB switch is used to select the turbulence detection mode of
operation. The TRB mode can only be selected if the FUNCTION
switch is in the WX position and the selected range is 50 miles or less.
The weather/turbulence mode is annunciated in the mode field with the
WX/T legend. Areas of moderate or greater turbulence are shown in
soft white. The turbulence threshold is five meters per second.
WARNINGS
1. TURBULENCE CAN ONLY BE DETECTED WITHIN AREAS OF
RAINFALL. THE PRIMUS
R
880 DIGIT AL WEATHER RADAR
SYSTEM CANNOT DETECT C LEAR AIR TURBULENCE.
2. UNDETECTED TURBULENCE CAN EXIST WITHIN ANY
STORM CELL. REFER TO SECTION 5, RADAR F ACTS, OF THIS
GUIDE FOR ADDITIONAL INFORMATION.
Selecting the 100--, 200--, or 300--mile range turns off turbulence
detection. The /T is deleted from the mode annunciation. Subsequently
selecting ranges of 50 miles or less re--engages turbulence detection.
A description of the turbulence detection capabilities and limitations is
given in Section 5 , Radar Facts, of this guide.
7 RANGE
The RANGE buttons are two momentary--contact buttons used to
select the operating range of the radar. The range selections are from
5 to 300 NM full scale. In FP mode, additional ranges of 500 and 1000
NM are available. The up arrow selects increasing ranges, and the
down arrow selects decreasing ranges. Each of the five range rings on
the display has an associated marker that annunciates its range.
8 AZ (Azimuth)
The AZ button is an alternate--action switch that enables and disables
the electronic azimuth marks. When enabled, azimuth marks at 30_
intervals are displayed. The azimuth marks are the same color as the
other alphanumerics.
9 SCT (Scan Sector)