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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 AUTO/CAL mode.
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.
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)
FUNCTIONS
Criteria: S16646, LR
Applicable to: , , , , , , , , , , , , , ,
, , , , ,
The flight crew can use the following to operate the radar:
TILT
"Tilt" is the angle between the antenna radar and the horizon, irrespective of the aircraft's pitch and
bank angles. The antenna stabilizes by using IRS data.
A330/A340 FLIGHT CREW TRAINING MANUAL
SUPPLEMENTARY INFORMATION
USE OF RADAR
A330/A340 FLEET SI-070 P 3/6
FCTM 17 JUN 09
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 bellow aircraft path. Before envisaging a route change
in front of an ambiguous or unexpected weather display, the crew should confirm the
potential conflict 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.
A330/A340 FLIGHT CREW TRAINING MANUAL
SUPPLEMENTARY INFORMATION
USE OF RADAR
A330/A340 FLEET SI-070 P 4/6
FCTM 17 JUN 09
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)
OPERATIONAL RECOMMENDATIONS FOR WEATHER DETECTION
Criteria: LR
Applicable to: , , , , , , , , , , , ,
A330/A340 FLIGHT CREW TRAINING MANUAL
SUPPLEMENTARY INFORMATION
USE OF RADAR
A330/A340 FLEET SI-070 P 5/6
FCTM 17 JUN 09
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.
OPERATIONAL RECOMMENDATIONS FOR WEATHER DETECTION
Criteria: S16646, LR
Applicable to: , , , , , , , , , , , , , ,
, , , , ,
FLIGHT PHASE DETECTION AND MONITORING PROCEDURES COMMENTS
TAXI Clear on parking area, set ND to lowest range, TILT DOWN then UP;
Check appearance/disappearance of ground returns.
Reselect AUTO after scanning.
Tilt Antenna check
　
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