Air carrier pilot reported during departure from PHX airport the Captain's radio altimeter and various displays malfunctioned. Pilot cited possible 5G interference as contributing.
Synopsis
Air carrier pilot reported during departure from PHX airport the Captain's radio altimeter and various displays malfunctioned. Pilot cited possible 5G interference as contributing.
Narrative
We were taking off on Runway 25R in PHX. At approximately 200 ft.; the Captain's radio altimeter went to negative 6 ft.; the lateral flight director in the Captain's primary flight display disappeared; the amber PWS FAIL (Predictive Windshear) message appeared in both navigation displays; VNAV disengaged and was replaced with the Level Change mode; and the flight director in the HUD disappeared. The First Officer's instrument indicated normal values and did not seem to be affected. At approximately 5000 ft. the indications on the Captain's primary flight instrument returned to normal and stayed normal for the remainder of the flight. The guidance cue (large circle) in the HUD froze in pitch on the horizon line. The flare cue was displayed in the lower half of the guidance cue and the green flare message in the HAP on the First Officer's panel illuminated. These indications did not change throughout cruise and descent. After being established on the ILS; the HUD returned to normal indications. I talked to dispatch and maintenance a few times via the Crew Phone and asked if they would like me to return to PHX for troubleshooting since it is a maintenance base. Since the weather in ZZZ1 was good and the primary instruments were back to normal indications; dispatch and maintenance wanted me to fly to ZZZ1 if possible. I decided to continue since the instruments were working fine. My first thought; when it happened; was a 5G interference; especially since the radio altimeter showed a constant negative 6 ft. All the indications we had are included in the list of possible malfunctions in the 'Potential for 5G Interference of Radio Altimeters' bulletin we received. I am therefore convinced that our malfunctions were triggered by a 5G interference. A 5G interference with our radio altimeter which then caused several additional malfunctions. Retest the specific model of Radio Altimeter in this aircraft. Test the effects of someone in the airplane using a 5G device during take-off or approach.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.