C172 pilot experiences a loss of GPS reception during a VMC RNAV 31 lpv approach to hio and continue...

Narrative:

While operating under visual flight rules and using the RNAV (GPS) 31 lpv guidance for reference; all GPS reception was lost. On about a 2 mile final there was an aural annunciation that stated: 'terrain system not available.' that was accompanied by a 'ter north/a' on the pfd and 'no GPS position' on the mfd. The aircraft was equipped with synthetic vision and that reverted back to the blue/brown attitude indicator. Since I was in VMC and VFR; I continued the landing visually and taxied to the ramp. Once on the ramp I pulled up the 'alerts' window on the G1000 pfd. There were multiple messages including 'GPS navigation lost - loss of GPS navigation. Insufficient satellites;' 'abort apr - loss of GPS navigation.' 'abort approach.' 'AHRS1 GPS - AHRS1 not receiving any GPS information.' the pilot of another aircraft which was equipped with a garmin glass panel said that he experienced the same failure while taxing to the ramp. My concern is the fact that this was a waas approach on a robust system with redundant GPS receivers in a brand new aircraft. If I had been in IMC; I would have been above the MDA prior to the vdp. The missed approach segment is GPS based so I would have been unable to execute the published missed approach. The fact that a failure like this occurred; while hopefully very rare; exposes some potential problems with widely utilized and heavily relied upon GPS navigation for critical phases of flight.

Original NASA ASRS Text

Title: C172 pilot experiences a loss of GPS reception during a VMC RNAV 31 LPV approach to HIO and continues to a landing. Had the weather been IMC the missed approach procedure would have required an operational GPS.

Narrative: While operating under visual flight rules and using the RNAV (GPS) 31 LPV guidance for reference; all GPS reception was lost. On about a 2 mile final there was an aural annunciation that stated: 'Terrain System Not Available.' That was accompanied by a 'TER N/A' on the PFD and 'NO GPS POSITION' on the MFD. The aircraft was equipped with Synthetic Vision and that reverted back to the Blue/Brown attitude indicator. Since I was in VMC and VFR; I continued the landing visually and taxied to the ramp. Once on the ramp I pulled up the 'Alerts' window on the G1000 PFD. There were multiple messages including 'GPS NAV LOST - Loss of GPS navigation. Insufficient satellites;' 'ABORT APR - Loss of GPS navigation.' 'Abort approach.' 'AHRS1 GPS - AHRS1 not receiving any GPS information.' The pilot of another aircraft which was equipped with a Garmin glass panel said that he experienced the same failure while taxing to the ramp. My concern is the fact that this was a WAAS approach on a robust system with redundant GPS receivers in a brand new aircraft. If I had been in IMC; I would have been above the MDA prior to the VDP. The missed approach segment is GPS based so I would have been unable to execute the published missed approach. The fact that a failure like this occurred; while hopefully very rare; exposes some potential problems with widely utilized and heavily relied upon GPS navigation for critical phases of flight.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1111145
Time
Date	201308
Local Time Of Day	1201-1800
Place
Locale Reference	HIO.Airport
State Reference	OR
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Skyhawk 172/Cutlass 172
Operating Under FAR Part	Part 91
Flight Phase	Final Approach
Route In Use	Visual Approach
Flight Plan	None
Component
Aircraft Component	GPS & Other Satellite Navigation
Person 1
Function	Pilot Flying Single Pilot
Qualification	Flight Crew Instrument Flight Crew Commercial Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 1100 Flight Crew Type 310
Events
Anomaly	Aircraft Equipment Problem Less Severe

C172 pilot experiences a loss of GPS reception during a VMC RNAV 31 lpv approach to hio and continues to a landing. Had the weather been IMC the missed approach procedure would have required an operational GPS.