B737 Undifferentiated or Other Model
Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 199; Flight Crew Total 11770; Flight Crew Type 11770
Distraction
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem
Environment - Non Weather Related; Aircraft
Arriving into IAH on the DRLLR 5 Runway 26L. Descending on a downwind between 5;000 and 4;000 past ZOEEE; we received a RA flag on the Captain side two separate times. It stayed illuminated for approximately 5 second both times. In the turn to capture the localizer for 26L at approximately 2;500 ft. we got a RA flag on the First Officer side; again; for approx 5 seconds. No other indications or anomalies were noted.
While flying the downwind leg of the DRLLR 5 STAR into IAH (Runway 26L) after passing ZOEEE intersection and a descent clearance to 6;000 feet the Captain stated he was seeing an amber RA (Radio Altimeter ) flag flash on his PFD. I cross checked my PFD and didn't notice any flags. It happened to his Radio Altimeter a few times. While turning base leg abeam GRIEG intersection I noticed my RA (Radio Altimeter) flash amber. I only noticed it happen once with my RA. The flags only appeared for a few seconds each time. ATC was informed. We didn't notice any other issues with the Radio Altimeters for the remainder of the approach. NOTAMs regarding the new 5G and AMOC (Alternative Methods Of Compliance) were reviewed during the briefing as well as during the flight. It says that the B737 has AMOC but I am not exactly sure what that means to the pilot. What are our AMOC's and how do we use them?
B737 flight crew reported encountering possible 5G interference while inbound to IAH.