Honeywell SPZ-8000 - Radar Mode - Ground Mapping; Radar Mode - Weather; Standby

SPZ--8000 Digital Integrated Flight Control System
A28--1146--055
REV 2
B--9
PRIMUS
R
650 Weather Radar System
Standby
When standby is selected, the antenna is stowed in a tilt--up position
and is neither scanning nor transmitting. If two controllers are installed,
both must be selected to standby for the system to be in standby.
Standby should be selected any time the operator wants to keep
system power on without transmitting.
Radar Mode -- Weather
For purposes of weather avoidance, pilots are urged to familiarize
themselves with FAA Advisory Circular AC 00--24B (1--20--83), Subject:
THUNDERSTORMS.
To assist the pilot in categorizing storms as described in AC 00--24B,
the radar receiver gain is calibrated in the WX mode with the GAIN
control pushed in. The radar is not calibrated when variable gain is
being used, but calibration is restored if RCT or target alert is selected.
To better interpret the display, targets are displayed in various colors.
Each color represents a specific level of precipitation.
In the WX mode, the PRIMUS
R
650 Weather Radar System displays
five levels as black, green, yellow, red, and magenta (in increasing
order of intensity).
REACT (RCT) is used in WX mode to compensate for attenuation of
the radar signal as it passes through a storm. It does this by increasing
the gain of the receiver as weather is detected.
The RCT button selects and deselects the cyan field display that
indicates the receiver is at maximum gain and the reference levels are
at final values. Any returns detected beyond that point are displayed as
magenta. (Selecting RCT prevents variable gain from operating.)
Target alert can be selected in any WX range except 300 NM. The target
alert circuit monitors for red level or greater targets within 7.5_ of
aircraft heading.
Radar Mode -- Ground Mapping
When the ground mapping mode is selected, the TILT control is turned
down until the proper amount of terrain is displayed. The degree of
down--tilt depends upon the aircraft altitude and the selected range.