SUPPLEMENTARY INFORMATION
USE OF RADAR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
To help avoid weather, it is important to effectively manage the tilt, taking into account the flight phase and the ND range.
Usually, it is the appropriate tilt value that provides ground returns on the top of the ND.
In case of overscanning, a cell may not be detected or may be underestimated, when the radar beam scans the upper part of the cell. This occurs because, at high altitude, this cell may have ice particles, and therefore the reflection of these particles is weak.
Selecting AUTO ensures a proper tilt management along the flight.
Note: In cruise, MULTISCAN function provides a large view of the weather ahead, ie display of weather cells located on and below aircraft path. Before envisaging a route change in front of an ambiguous or unexpected weather display, the crew should confirm the potential conflicts with aircraft path, using temporarily manual tilt.
GAIN
Manual gain selection (+8) must be used when MULTISCAN selector is set to AUTO.
However, the gain may be tuned to detect the strongest part of a cell displayed in red on the ND. If the gain is slowly reduced, the red areas (level 3 return) will slowly become yellow areas (level 2 return), and the yellow areas will become green areas (level 1). The last part of the cell to turn yellow is the strongest area.
The gain must then be reset to +8.
MODE
The operation modes are WX, WX+T, TURB, MAP.
WX+T or TURB modes are used to locate the wet turbulence area. TURB mode detects wet
turbulence within 40 nm, and is not affected by the gain. TURB mode should be used to isolate turbulence from precipitation.
GCS
The Ground Clutter Suppression (GCS) operates in WX mode, and inhibits the ground echoes on the ND.
It is sometimes difficult to differentiate between weather and ground returns. A change in tilt rapidly changes the shape and color of ground returns and eventually makes them disappear. This is not the case for weather.
SUPPLEMENTARY INFORMATION
USE OF RADAR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
RCT
The React (RCT) function is used temporarily to help detect weather or buildups beyond of the weather already detected.
PWS
Refer to SI-010 WINDSHEAR on adverse weather.
OPERATIONAL RECOMMENDATIONS FOR WEATHER DETECTION
Criteria: SA
2 Applicable to: MSN 0045-2629
SUPPLEMENTARY INFORMATION
USE OF RADAR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
Note: It is difficult to differentiate between weather returns and ground returns: A change in TILT causes the shape and color of ground returns to change rapidly. These ground returns eventually disappear. This is not the case for weather returns. 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A318/A319/A320/A321 机组训练手册 FCTM Flight Crew Training Manual(182)
