Cosmo
I'll be the first to admit I'm not one for what goes on beyond the front of the box in most cases, I just simply comply with E-GPWS protocols set forth in my SOPS. I read the same excerpt that safetypee has kindly posted as I fly with a Honeywell product as well. Other areas of the manual available on my companies website also allude to GPS being a component used in E-GPWS.
Am I understanding you correctly to say GPS has no input to E-GPWS? Specifically mode 4.
Under GPWS I would agree regarding the RADALT but I've been taught (perhaps improperly, perhaps oversimplified) that E-GPWS is based in part off a data base that compares position against a data base and ADC input and warns you of the terrain ahead, sometimes a fair distance ahead. This being something a RADALT has no way of doing accurately.
Please school me up if I'm wrong.
Last edited by West Coast; 23rd September 2013 at 07:41.