Nathan Young wrote:
On Fri, 10 Mar 2006 04:34:29 -0800, scott moore
wrote:



Question: When a WAAS and ILS approach co-exist for the same runway,
does the FAA make the WAAS approach so it is an exact overlay of the
ILS? It would be nice to run the WAAS approach on the GPS, and have
NAV2 tracking the ILS as a backup.

The FAA policy is to duplicate the ILS when possible, to include
glidepath angle, TCH, and intercept altitude. The goal is to have the
same fixes shared by the ILS and LAAS. Missed approach criteria is
different for LAAS than for ILS, so there are times that the missed
approach can't be duplicated because the ILS missed approach turns too
much or too soon.
See para 491b at the following link for particulars;
http://www.faa.gov/about/office_org/...19C%20CHG3.pdf

JPH