WAAS GPS approach question.

On 04/20/06 15:24, wrote:
WAAS Approaches have vertical guidance but they
are not classified as "Precision"

Bill Hale


Are you sure about that? I thought the P in LPV stood for Precision?
Also, the LPV approaches have a DA rather than an MDA, which also
implies a precision approach, doesn't it?


--
Mark Hansen, PP-ASEL, Instrument Airplane
Cal Aggie Flying Farmers
Sacramento, CA

Officially, LPV refers to "Localizer Performance with Vertical
Guidance". Officially it's not precision, perhaps
not-so-non-precision. With horizontal and vertical accuracies in the
1-2m range, its arguably more accurate than a Cat III ILS. It does not
however,have the integrity of a Cat III. The LPV approach does indeed
have a decision altitude which currently is as low as 250ft HAT, and
the recent approval of 200' DA's will likely start showing up on
procedures next year.

Brad