Commercial Fixed Wing
Flight Crew Commercial; Flight Crew Flight Instructor; Flight Crew Instrument; Flight Crew Multiengine
Flight Crew Last 90 Days 268; Flight Crew Total 1470; Flight Crew Type 345
Distraction
Aircraft Equipment Problem Critical; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Environment - Non Weather Related; Aircraft
While being vectored for the ILS 10L at PBI; we experienced a radar altitude indication of zero; first intermittently; then continuously. As a result; the airplane's EGPWS system sounded multiple alerts and alarms (TERRAIN; PULL UP; SINK RATE; DON'T SINK; and TOO LOW: GEAR) continuously during the vector to final and during the final approach itself. The error began at a location approximately 20 NM northwest of the PBI; immediately after turning to heading 210 on a left base for Runway 10L outside of WILBA Intersection; and continued through interception and descent until approximately 2 miles inside of ZISUR (final approach fix) at approximately 1;400 feet.During this time; the radio altimeter on the Captain's side read zero; first intermittently then continuously; while the First Officer's radio altimeter read correctly. The PIC reports that the issue has occurred previously; though not for such a long duration. The issue only occurs at PBI (never other airports); only for Runway 10L (never 28R); only on left base (never right); and only when being vectored out to or outside of WILBA (never while on a tighter visual approach). This suggests a cause that is local to the area north of the WILBA Intersection.Company maintenance; Chief Pilot; and ATC were advised of this and previous occurrences.The alarms represent a significant distraction during a critical phase of flight; and in IMC the conflicting RA data could be a threat to safety.
Air carrier First Officer reported aircraft problems possibly associated with 5G interference inbound to PBI.