Commercial Fixed Wing
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Commercial
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem
Environment - Non Weather Related; Aircraft
Operating to BOS; we experienced a radar altimeter anomaly in cruise at FL350. This occurred approximately 20nm east of HRRSH intersection while navigating from HRRSH direct to BUF. Twice; in quick succession; both radar altimeters scanned up and down; along with an aural '500' call from the GPWS system. There was no traffic in proximity to our aircraft on TCAS at this time.In 15 years I've not seen this occur before; and I suspect it to be possible 5G interference and should be looked into further.
Air carrier First Officer reported radio altimeter anomalies in cruise flight at FL350; citing possible 5G interference.