Tracking those section and subsections makes my head ache, but 1-1-19 is
clearly labeled "Doppler Radar" in my 2004 FAR/AIM. In any event, a section
titled "Receiver Autonomous Integrity Monitoring," in subsection (3), tells
the reader that if a RAIM/status annunciation occurs prior to the final
approach waypoint, the approach should not be completed since GPS may no
longer provide the required accuracy." Subsection (4) says: "If the receiver
does not sequence into the approach mode or a RAIM failure/status
annunciation occurs prior to the FAWP the pilot should not descend to MDA
but should proceed to the missed approach waypoint (MAWP) via the FAWP,
perform a missed approach, and contact ATC as soon as practicable."

With the exception of telling us how to pronounce fiver and niner and how to
report altitudes, the AIM is not big on pilot phraseology, as you know. ATCH
tells controllers exactly what to say, with little wiggle room, but pilots
have no similar publication to refer to...and I suspect that that situation
will not change.

Bob Gardner
"Roy Smith" wrote in message
...
In article ,
"Bob Gardner" wrote:

Look to the AIM, not the manual. 1-1-20(j)(3) makes it clear.

Thanks for the reference (although, it looks like it's really 1-1-19,
not 1-1-20, at least in the version I've got). While that does clear
things up a bit, it still leaves one with a bit of head-scratching to do.

The immediate action is clear; continue to fly the approach track, but
do not descend to the MDA, and execute the missed when you reach the
MAWP.

But what then? It says I should contact ATC as soon as practical, but
what do I tell them? Presumably, I start with the obvious, "New York,
3875T, missed approach", but what do I want to do after that? If I just
get vectors back for another shot, is it likely that the condition which
caused the RAIM alert will have resolved itself by then?

Is there a standard phrasology for telling the controller you had a RAIM
alert? It seems like there should be some compact way to say, "I had a
problem with my GPS equipment, but don't worry, it'll fix itself in a
little while".