September 24, 2009
As of Sept. 28, pilots utilizing non-WAAS-equipped IFR GPS units under instrument flight rules (IFR) must perform a Receiver Autonomous Integrity Monitoring (RAIM) check as part of their preflight requirements prior to flying certain routes and procedures.
The routes and procedures affected include:
Loss of GPS RNAV instrument approach procedures are not affected by this change because IFR GPS units automatically perform a RAIM check before beginning an approach.
WAAS-equipped GPS receivers do not require a preflight RAIM check. However, pilots must still check WAAS notams to learn of any predicted outages. These notams are not included in a standard briefing and must be requested.
For more information, as well as a list of the units affected, see AOPA’s issue brief.
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