Narrative:

The RNAV GPS 28L approach at hayward; ca (hwd) has been notamed as not available since january 19th due to numerous aircraft (including mine) experiencing loss of GPS signal integrity during the approach - typically at approximately 3 nm from the runway threshold. This issue has been intermittent but continues. Yesterday; I was flying the localizer DME 28L approach into hayward using the localizer in navigation#1&2 driving the localizer CDI on the G1000NXI installed in the aircraft. As I was in the step down from rishe to the MDA (descending from 1;560 feet rishe to the 500 feet MDA); in low visibility (2SM RA) my GPS lost position and I encountered a series of aural warnings (taws system not available); flags and error messages on the pfd. With the aircraft based at hwd; I have experienced these warnings before; although an unwanted distraction at this phase in the approach! Clearly with the navigation source set to the i-hwd localizer & DME readout; this did not impact safely flying/navigating the approach. For visiting aircraft similarly equipped; there is no warning that GPS signal integrity and reception *may* be compromised during arrivals into hwd. The only NOTAM relevant is the amendment 1B advising the na condition of the RNAV GPS 28L approach - namely this one:!fdc 9/5227 hwd IAP hayward executive; hayward; ca.RNAV (GPS) runway 28L; amdt 1B...procedure na. Perhaps there should be a NOTAM posted advising of the possibility of GPS signal loss in this area - approximately 3 nm on final 28L and with a diameter of approximately 1 nm? With the recent government shutdown; I understand the challenges associated with resolving this issue but it seems that both FAA and FCC should treat this as an urgent matter to resolve.

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Original NASA ASRS Text

Title: TBM-910 Pilot reported GPS signal interruption on several occasions while on approach to HWD airport.

Narrative: The RNAV GPS 28L approach at Hayward; CA (HWD) has been NOTAMed as Not Available since January 19th due to numerous aircraft (including mine) experiencing loss of GPS signal integrity during the approach - typically at approximately 3 nm from the runway threshold. This issue has been intermittent but continues. Yesterday; I was flying the LOC DME 28L approach into Hayward using the Localizer in NAV#1&2 driving the LOC CDI on the G1000NXI installed in the aircraft. As I was in the step down from RISHE to the MDA (descending from 1;560 feet RISHE to the 500 feet MDA); in low visibility (2SM RA) my GPS lost position and I encountered a series of aural warnings (TAWS SYSTEM NOT AVAILABLE); flags and error messages on the PFD. With the aircraft based at HWD; I have experienced these warnings before; although an unwanted distraction at this phase in the approach! Clearly with the NAV source set to the I-HWD localizer & DME readout; this did NOT impact safely flying/navigating the approach. For visiting aircraft similarly equipped; there is no warning that GPS signal integrity and reception *may* be compromised during arrivals into HWD. The only NOTAM relevant is the Amendment 1B advising the NA condition of the RNAV GPS 28L approach - namely this one:!FDC 9/5227 HWD IAP HAYWARD EXECUTIVE; Hayward; CA.RNAV (GPS) RWY 28L; AMDT 1B...PROCEDURE NA. Perhaps there should be a NOTAM posted advising of the possibility of GPS signal loss in this area - approximately 3 nm on final 28L and with a diameter of approximately 1 nm? With the recent government shutdown; I understand the challenges associated with resolving this issue but it seems that both FAA and FCC should treat this as an urgent matter to resolve.

Data retrieved from NASA's ASRS site 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.