Airbus Industrie Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Flight Crew Last 90 Days 80; Flight Crew Total 962; Flight Crew Type 962
Confusion; Distraction; Situational Awareness; Troubleshooting; Workload
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Aircraft; Airport; Environment - Non Weather Related; Equipment / Tooling
While at TPA Gate the Captains Radar altimeter fluctuated from approximately -90 ft. to 400 ft. Multiple callouts were observed such as 'retard' and various altitudes. Further; the nav FMA went from armed to captured.The malfunction rectified itself and we safely departed. An information write-up was entered into the logbook and Maintenance checked the radar altimeter in ZZZ. No errors found.I've been flying an aircraft with a radar altimeter for years and never once have I seen a malfunction such as this until the 5G turn on. Coincidence? Probably not.
Air Carrier Captain reported a malfunctioning radio altimeter while parked at the TPA terminal. The Captain suspects this malfunction is related to 5G interference.