June 17, 2009

GPS RAIM PREDICTIONS REQUIRED

The FAA will require GPS RAIM predictions starting July 1 as part of your preflight planning by pilots filing RNAV 1 routes (Q and T), RNAV 1 STARs, and RNAV 1 DPs. Instead of just doing a RAIM prediction for your approach, you’ll also need to predict that you’ll continue to have RAIM for every leg of the flight, including your alternate if it’s GPS.

FAA document AC 90-100 states: “The pilot should confirm the availability of RAIM with the latest GPS NOTAMs. If no GPS satellites are scheduled to be out-of-service, then the aircraft can depart without further action. If, however, any GPS satellites are scheduled to be out-of-service, then the availability of GPS integrity (RAIM) must be confirmed for the intended flight (route and time). In the event of a predicted, continuous loss of RAIM of more than five minutes for any part of the intended flight, the flight should be delayed, canceled, or re-routed where RAIM requirements can be met."

Jan Hoynacki, Executive Director
USPA

Posted by Jan at June 17, 2009 08:34 PM