Regor. From FCOM 1.34.60 P2, with windshear switch to AUTO, ''Predictive windshear function is activated: windshear areas are detected by the antenna scanning below 2300 ft RA, even if the tranceiver 1-2 selector is set to OFF, and displayed on the ND if below 1500 ft. OFF: No predictive windshear function.''
In addition, to get predictions, the ATC must be ON or AUTO and 1 engine must be running.
There are 4 alert levels:
Warning (Approach) gives ''GO AROUND WINDSHEAR AHEAD'' from Pierre, W/S AHEAD in red on the PFD and the windshear icon on the ND.
Warning (Takeoff) gives ''WINDSHEAR AHEAD'' twice from Pierre, W/S AHEAD in red on the PFD and the windshear icon on the ND.
Caution gives ''MONITOR RADAR DISPLAY'' from Pierre, W/S AHEAD in amber on the PFD and the windshear icon on the ND.
An advisory only gives you the icon on the ND.
One tip from me is that with the wx radar off, you will see the scanner tilt display appear in blue at the bottom right of the ND when you put the PWs to AUTO. This serves as a reminder that it is on.
Hope this all helps. It has been interesting to research!
Cheers,
mcdhu
