TBM 900 / TBM 930
Flight Crew Commercial; Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 35; Flight Crew Total 1915; Flight Crew Type 270
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Other / Unknown
Flight Crew Overcame Equipment Problem
Airspace Structure; Chart Or Publication; Procedure
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.
TBM-910 Pilot reported GPS signal interruption on several occasions while on approach to HWD airport.