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Old 11th January 2011 | 00:22
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singletracker
 
Joined: Jul 2009
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From: Denver CO
737NG GPWS ("reactive") windshear alerts?
Hey all...

Quick question about the 737NG's GPWS windshear alerts (not PWS).

The Boeing FCOM says this in the Warning Systems chapter:
Windshear warnings are accompanied by WINDSHEAR on the attitude indicators and voice aural alerts.
Windshear cautions are accompanied by a voice aural alert.
So am I to understand that, a windshear caution has no yellow WINDSHEAR caption on the PFD below the attitude sphere? In other words, just a "WINDSHEAR, WINDSHEAR" aural warning? Then why, during the GPWS test, do we see a flashing WINDSHEAR followed by WINDSHEAR?

Also, the FCOM has no information about what data the GPWC uses to issue the windshear alerts. I assume it's something to to with rate of change of groundspeed versus airspeed... does anyone know for sure?
Last edited by singletracker; 11th January 2011 at 05:12.
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