Departure/Enroute RAIM

A chart change notice (and a similar Jeppesen briefing bulletin) were
sent to all subscribers in the past few weeks setting forth the new Type
A or B requirements for RNAV OPDs, SIDs, and RNAV routes.

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. And, if the aircraft can get into the low flight
levels and use a Q Route, then a predictive RAIM check must be made.

This is all dependent upon whether any of the GPS birds are inoperative,
the determination of which places a significant new burden on the light
aircraft IFR pilot using IFR GPS.

AOPA just issued a bulletin on the subject, which I feel really glosses
over the issues raised by all of this.

http://www.aopa.org/whatsnew/newsite...50901rnav.html

These requirements became effective yesterday.

Does anyone know how to do a predictive RAIM check with a 129 box? What
is required for using an RNAV ODP, a perdictive RAIM check or an actual
terminal RAIM check at departure time? How is a terminal RAIM check
accomplished (as opposed to an approach RAIM check, which is easy to do,
but perhaps overly restrictive).

Anyone understand this stuff? I know I am confused.

I suppose most non-commercial operators will be able to just press on
and just fly the ODP. No doubt it will be just as safe post-Sept 1st as
it was before. But, eventually some inspector, designee, or CFI-I doing
an ICC is going to make an applicant do a rug dance over this new stuff.