Departure/Enroute RAIM

On Fri, 02 Sep 2005 11:42:49 -0700, wrote:

That is correct, but few folks have WAAS 146 boxes and no biz jet or air
carrier has WAAS.

I'm not sure of the relevance of this comment to my statement.

1. The fact that most folk may not have WAAS 146 box still means that the
RAIM stuff is not applicable to the 146a boxes.

2. Not only do the biz jet or air carriers not have WAAS, but it is my
understanding that very few have GPS. Hence they would not be doing RAIM
to assure their RNP accuracy in any event.

3. The lack of intercontinental coverage is not really an issue for most
as the procedures are being enacted in US airspace, aren't they?




Ron Rosenfeld wrote:

On Fri, 02 Sep 2005 05:56:12 -0700, wrote:

The practical aspect for light aircraft equipped with either TSO 129 or
146 boxes is that a terminal RAIM check must not be accomplished before
using an RNAV ODP.

According to the AOPA article, RAIM check's need NOT be done for a TSO 146
box unless there is a WAAS outage.

"Of course, if you have the latest IFR GPS navigation system, a Wide Area
Augmentation System (WAAS) receiver, no RAIM checks are needed. Just make
sure no WAAS notams are published, and you're good to go."

Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)

Ron (EPM) (N5843Q, Mooney M20E) (CP, ASEL, ASES, IA)