Note: Weather and ground returns are difficult to differentiate: a change in TILT rapidly changes the shape and color of ground returns and eventually cause them to disappear which is not the case for weather.
OPERATIONAL RECOMMENDATIONS FOR WEATHER DETECTION
Criteria: P7929, SA Applicable to: MSN 2907
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
(away from people)
TAKE OFF If weather is suspected, SLOWLY SCAN up to +15 °C, then reselect AUTO. Scanning along
departure path
IN FLIGHT Use TURB to ISOLATE Turbulence Poor ground
return over calm
sea / even ground
Note: 1. GAIN must be manually set to +8, when MULTISCAN selector is set to AUTO.
2. MULTISCAN AUTO mode provides an efficient ground clutter rejection. During operations in good or non-significant weather, no weather pattern will be displayed on ND's. In such situation, the crew ascertains correct radar operation, using temporarily MANUAL TILT.
3. The crew monitors weather radar display in AUTO, and confirms any ambiguous or unexpected weather display using manual tilt according to standard techniques.
SUPPLEMENTARY INFORMATION
USE OF RADAR
A318/A319/A320/A321
FLIGHT CREW TRAINING MANUAL
OTHER OPERATIONAL RECOMMENDATIONS
Applicable to: ALL
WEATHER AVOIDANCE
? When weather is suspected, scan for it by varying the radar tilt. If AUTOTILT or MULTISCAN function is available, reselect AUTO after scanning.
? Do not underestimate a thunderstorm, even if echo is weak (only wet parts are detected)
? Avoid all red + magenta cells by at least 20 nm
? Deviate upwind instead of downwind (less probability of turbulence or hail)
? Do not attempt to fly below a storm even visual (turbulence, shear, altimetry)
? Use TURB detection to isolate turbulence from precipitation
? There may be severe turbulence, up to 5 000 ft above a cell
? Storms with tops above 35 000 ft are hazardous
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