Therefore, when a threatening thunderstorm gets below the radar beam (i.e. radar returns are weakening), the image of the thunderstorm stored in the database is displayed until the aircraft passes the thunderstorm.
The Over-Flight Protection operates above 22 000 ft. The 6000 ft clearance below the aircraft is a maximum. When the aircraft flies at 26 000 ft, the clearance is 4 000 ft (26 000 ft minus 22 000 ft).
instead the bottom part.
6.1.5.5.5. Regional Weather Reflectivity Compensation
The reflectivity of a cell varies according to the region where the cell develops
(refer to Appendix G – Aviation meteorology reminders / G.2.5 – Oceanic Cell). A
regional weather reflectivity compensation adjusts the gain and tilt for a more accurate representation of a cell in a given region. The regional weather reflectivity compensation activates when the aircraft is over a specific type of region. The weather radar detects the type of the flown region thanks to an internal data base. The internal data base includes oceanic, equatorial and polar regions. Based on the aircraft position, the Multiscan radar provides an optimum tilt adapted to the flown region.
6.1.6. REACTIVE WIND SHEAR INDICATIONS
WIND SHEAR, WIND SHEAR,
WIND SHEAR
The red WIND SHEAR indication on PFD
flashes.
Figure 6-28: Reactive Wind Shear
warning on PFD
6.1.7. WEATHER RADAR INDICATIONS
The weather radar display on ND is available in ROSE and ARC modes.
The weather radar displays weather information on ND according to the reflectivity of targets (i.e. green, yellow or red, refer to 6.1.1.4 – Gain).
Instead of WXR MSG (rounded in dash red on Figure 6-29), indications from the weather radar about the operating modes or failures are displayed.
6.1.7.1 – Weather Radar Messages provides the list of these indications.
6.1.7.1. WEATHER RADAR MESSAGES
Message Cause Effect Message Cause Effect
WXR DU4 DU overheating Image lost MAN XX.X Manual tilt Manual mode
WXR R/T WXR transceiver failure
W/S failure Image not lost
WXR ANT WXR antenna failure WXR ATT Attitude stabilization failure
WXR CTL WXR control unit failure Autotilt failure
WXR RNG Discrepancy between EFIS CP range selection and DMC range WXR STAB Loss of antenna stabilization
WXT TEST Test mode Test image
MAN GAIN Manual gain Manual mode PWS SCAN6 Weather radar OFF PWS mode
Note: Shaded cells above apply to Honeywell radar only.
6.1.7.2. WIND SHEAR INDICATIONS
Predictive Wind Shear Caution Predictive Wind Shear Warning
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