Originally Posted by
Square Bear
... a further question...Is this TFC a standard fit, or a Boeing "add on"? Asking as I have had never heard of TFC in the Boeing until reading it here....well aware of the VSD and also aware of the various modes of the EGPWS, but TCF??.
As far as I'm aware, it's not an 'add on', but a 'standard' part of the 'E' (ie Enhanced) bit of Honeywell's EGPWS. If you have EGPWS with the Terrain Alerting Display option enabled, you have TCF.