Commercial Fixed Wing
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Distraction
Aircraft Equipment Problem Less Severe; Ground Event / Encounter Ground Equipment Issue
Flight Crew Overcame Equipment Problem
Environment - Non Weather Related; Aircraft
Suspected 5G EventOn an Autopilot coupled ILS approach to 7L in Anchorage we intercepted the glide slope at 2;000 ft. about a mile and a half outside the final approach fix. Just after the intercept the glide slope indicator on the PFD (Primary Flight Display) began rapidly bouncing between 1/2 dot low to 1/2 dot high. The yoke correspondingly began oscillating in short rapid forward and aft movements. The aircraft flight path remained stable. My first thought was that there was a temporary ground interference with the glide slope antenna. The oscillations began diminishing as we crossed the final approach fix at 1;600 ft. when we got a NO LAND 3 EICAS Caution advisory. About five or six seconds later the Autopilot disengaged un-commanded. I cancelled the Autopilot wailer and completed the approach manually. The entire approach was accomplished in VFR conditions This event occurred at approximately XA:20Z.I didn't get a chance to read the 5G Interference bulletin until after we landed in Anchorage. When I did it occurred to me that our event may have been a 5G interference issue.
Air carrier pilot reported that during an autocoupled approach the glide slope indicator and yoke began oscillating; followed by an uncommanded disengage of the autopilot. Pilot completed the approach manually.