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 
　
中國航空網 m.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：getting to grips with surveillance(101)