Heavy Transport
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 200.68; Flight Crew Total 11974.58; Flight Crew Type 2899.70
Distraction; Situational Awareness; Time Pressure
Aircraft Equipment Problem Less Severe
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew FLC complied w / Automation / Advisory; Flight Crew Overcame Equipment Problem
Aircraft; Environment - Non Weather Related
On downwind descent to 5;000 feet into TLV on the GEFEN1C RNAV Arrival; RNAV RNP accuracy degraded below the required 1.0 NM; showing possible 1.5 NM error.  Got a number of EICAS Messages including GPS-R inop and ADS-B updating; Unable RNP; etc.  Pilot Monitoring called ATC and requested radar vectors to final on ILS26 and ATC complied.  Simultaneously; an [aircraft] also reported nav issues and requested vectors.  We had been briefed by the other Relief Pilot that this might happen because he had had the same thing happen; plus a map shift; last week when he flew to TLV; so we were prepared for the eventuality and Pilot Flying intercepted the ILS26 and landed with no further complications.  The aircraft automatically wrote up the EICAS messages and we debriefed with the maintenance guys after arrival.  The repeated EICAS messages at low altitude were a distraction.
Heavy transport aircraft First Officer reported GPS failures on the approach at this foreign international airport.