GPS missed approach question

Ron Rosenfeld wrote:
On Sat, 10 Sep 2005 17:30:27 GMT, Tim wrote:



The new RNAV (RNP) criteria presume a complete loss of GPS for the
missed approach. If the airspace/obstacle environment will permit a
heading or track to a VOR missed approach in the event of loss of GPS,
then no backup is required. If the missed approach areas are too tight
then dual or triple IRUs are required.



Where is that requirement spelled out for Part 91 operators using GPS
(single-sensor)? I don't see it in AC90-100, but that does not deal with
missed approaches.


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

First, you can't use the new procedures at all unless you receive a
letter of authorization from your FSDO. That is a requirement of
"SAAAR." Part of that qualification requirement is to understand the
requirements of each RNAV (RNP) SAAAR SIAP. There is currently in
coordination such a "dual-thread" IAP for KSUN. The missed approach
reads in part, "RNP required." Implicit in that is the ability to
maintain RNP with loss of GPS. That can only be done with an IRU platform.