Originally Posted by
FlapsOne
Don't think EGPWS does that!
FlapsOne Perhaps I could have clarified my post; ‘during take-off’ is from rotation onwards. The following description is from the Honeywell EGPWS pilots guide.
“Mode 7 is designed to provide alerts if the aircraft encounters windshear. Two alerting envelopes provide either a Windshear Caution alert or a Windshear Warning alert each with distinctive aural and visual indications to the flight crew.
EGPWS windshear is provided for certain (not all) aircraft types and is a function of certain additionally required input signals and enabled internal detection algorithms. These are established during the initial installation and addressed in the appropriate Airplane Flight Manual (AFM) or EGPWS Airplane Flight Manual Supplement (AFMS).
Mode 7 Windshear alerting is active under the following conditions:
• During takeoff; from rotation until an altitude of 1500 feet AGL is reached,
• During approach; From an altitude of 1500 feet down to 10 feet AGL,
• During a missed approach; until an altitude of 1500 feet AGL is reached.”
EGPWS does not provide predictive windshear warning (PWS), which as you state is normally a radar function.