737 MAX Flight Crew Operations Manual
Flight Management, Navigation -
Navigation Systems Description
11.20.16
MN-FLT-OH-201
RDR-4000 IntuVue Radar
1B401, 1B402, 1B801 - 1B824
The IntuVue weather radar collects data from different scans and merges the
information into a total weather picture. Special software eliminates ground
clutter resulting in clutter-free viewing of significant weather out to 320 nm.
When operating in the automatic mode, multiple radar scans at pre-selected tilt
angles detect short, mid, and long range weather. Tilt and gain inputs are not
required. This results in weather detection at all ranges and in all phases of flight.
Additional processing ensures data from thunderstorm tops within 5,000 feet of
the airplane remain on the radar display until it no longer poses a danger, thus,
enabling flight around thunderstorms that may not be visible otherwise.
• MAP – The purpose of the MAP mode is to aid in identifying prominent
terrain features such as coastlines, lakes, an large built-up urban areas.
MAP mode provides an extended ground map picture by piecing
together individual scans and combining them in the memory for
display. Reflectivity data that is considered ground clutter (and removed
from the weather views) is the basis for the Ground Map. Data from the
terrain database is not used, providing a independent verification of
position. The Ground Map is generated automatically and
simultaneously with weather.
• AUTO - Automatic weather mode provides weather, turbulence, and
predictive windshear detection. The system processes the data to fill the
3D memory and extracts the selected data for display. When a predictive
windshear (PWS) event is detected, an icon is shown on the display.
Returns determined to be ground clutter are not shown. Weather targets
are color-coded by the intensity of the return. The flight path weather
that fills the 3D memory is the detected weather in front of the aircraft
out to 320 nm, and from ground level up to 60,000 feet mean sea level
(MSL). The radar designates weather along the flight path as “flight
path” weather. All other weather is designated as “secondary” weather,
and is displayed with black stripes through it.
March 1, 2021
