Planning A Path - Honeywell IntuVue RDR-7000 Pilot's Manual

PLANNING A PATH

Remember to plan a deviation path early. Simply skirting the red or
magenta portion of a cell is not enough. Wherever possible, plan an
avoidance path for all weather echoes which display beyond 100 nm
since this indicates they are quite dense. If a REACT field is shown,
plan to avoid that area since there may be weather there that the
radar cannot detect. Refer to the FAA Approved Airplane Flight
Manual and to the FAA Advisory Circulars referenced on page 5 for
detailed information on flying in the vicinity of and avoiding
thunderstorms and turbulence.
The most intense echoes indicate severe thunderstorms. Remember
that hail may fall several nm from the cloud, and hazardous
turbulence may extend as much as 20 nm from the cloud. Avoid the
most intense echoes by at least 20 nm, if possible. If the Hazard
Display features are installed, avoid areas with hail or lightning icons
by a similar distance. As echoes diminish in intensity, you can reduce
the distance by which you avoid them.
The lightning and hail icons provide additional clues as to whether
reflectivity indications are associated with convective developments
and provide an indication that the convection may be generating hail
and/or lightning. As with any weather radar system, the crew must
integrate all possible information including information from sources
other than weather radar such as forecast conditions, PIREPs,
ground-based weather systems and Air Traffic Control when making
deviation and penetration decisions.
Also, note that by definition Clear Air Turbulence is always possible in
areas of no displayed reflectivity.
PATH PLANNING CONSIDERATIONS

Where possible, any indicated reflectivity should be avoided.

Reflectivity may generally be penetrated if the crew is sure that the
reflectivity is associated with stratus (non-convective) rainfall.
Stratus rainfall is characterized by widespread, relatively
o
uniform reflectivity, with tops often below 25,000 feet, and with
little or no indication of turbulence.

Weather with tall vertical development (as can be determined
using the manual mode), indications of turbulence, lightning,
and/or hail should be considered convective and should be
avoided.
Principles of Weather Radar Use
48
IntuVueRDR-7000 Weather Radar Pilot's Guide
D201911000094
Rev 0, Feb 2020