Air carrier flight crew reported on arrival into DEN airspace receiving multiple GPS failure warnings. The crew reported these failures to ATC and were told several aircraft were experiencing similar problems.
Synopsis
Air carrier flight crew reported on arrival into DEN airspace receiving multiple GPS failure warnings. The crew reported these failures to ATC and were told several aircraft were experiencing similar problems.
Narrative
Aircraft X on arrival from ZZZ-DEN flying the ZZZZZ RNAV Arrival on XXR transition but then updated to a visual approach for Runway XXL. ATIS information warned of ADS-B and GPS issues around DEN airport. Approximately 10nm North of ZZZZZ1 at approx 15;000 feet got 'GPS Primary Lost' FMGC indications for both Captain and First Officer as well as loss of EFB location information. Shortly thereafter got NAV ADS-B FAULT Channel 1 and Channel 2 and NAV TCAS FAULT alert message. After about 30-45 seconds GPS PRIMARY was restored and alert messages cleared on their own. 30-45 seconds later the pattern repeated. Visual with the airfield I elected to disengage autoflight and auto thrust to fly manually. The alert message pattern continued for 3-4 cycles until Captain opted to select 'EMER CANCEL' on the alert message system to stop the distraction of multiple repeating alert messages. Multiple aircraft on DEN Approach radio frequencies reported similar issues in the general area. It was enough that DEN Approach Controller began broadcasting a warning to all aircraft on his frequency to expect ADS-B and GPS interference problems.After landing the Capt and I informed maintenance at the gate but did not submit a write-up. We agreed that with so many other aircraft in the area reporting the same issues on approach frequencies and the ATIS warning this was almost certainly an airspace/airport problem and not an aircraft system problem. As of this morning DEN ATIS reports 'GPS; TRANSPONDER; ADS-B ANOMALIES REPORTED IN THE DENVER AREA.' [Our location was] 10nm North of ZZZZZ1 on ZZZZZ RNAV Arrival.
Second reporter narrative
We were in descent to DEN on ZZZZZ RNAV arrival with expect visual approach to [Runway] XXR then reassigned to XXL visual and ATIS reporting guidance with NAV equipment in ADS B in airspace. On descent around 15;000 feet descending to 11;000 feet about 20 miles from airport slowing to 210 knots for ZZZZZ1 Intersection. We started to notice first anomaly of NAV GPS primary loss on both and in scratch pad. This was anomaly intermittently displayed through the entire remaining descent and approach. The next anomaly we received was GPS location lost on both our EFBs. The next anomaly was NAV ADS B fault and subset was both channels were failed. This was an intermittent problem reoccurring approximately 4 times the first 2 we did full alert messages and the last 2 using EMER Cancel where by the first cancel only canceled channel on the second canceling channel 2. Last anomaly was NAV TCAS invalid while established visually to the airport inside 8;000 feet established both on LOC and GS. We landed without further incident. ATIS reported the airspace anomalies but out fleet was certified as AMOC (Alternate Means of Compliance) and no one expected theses multiple anomalies. The outbound crew reported they too had similar events. We did not write up the defects as we felt was specific to airspace not aircraft and reported to Maintenance Control for system resets. I reported to fleet and they are aware.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.