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True, but the point is now that DH is now measuring height, not
altitude. DH once upon a time referred to what was actually a decision altitude. and I may be missing something, but I don't see where the charts refer to altitudes as heights. You may be right about Part 91. If so, it probably is the sloppiness that Roy Smith referred to. On Fri, 8 Apr 2005 09:02:37 -0400, "Barry" wrote: It's above TDZE, but DA used to be called DH. There was no "DA" on approach charts until a few years back. The use of DH is not so much sloppiness as long term memory in a lot of cases. It's not as clear as it should be: - The AIM says that DA replaces DH for RNAV procedures with vertical guidance. - The FAA's Instrument Procedures Handbook says "DA is currently used on RNAV approach charts with vertical descent guidance. DA will replace DH for Category I precision IAPs. MDA and DA are referenced to MSL and measured with a barometric altimeter. CAT II and III approach DHs are referenced to AGL and measured with a radio altimeter." - The Terminal Procedures legend (front of the NACO approach chart books) and FAR Part 91 still use only DH as far as I can see. |
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