Medium Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Confusion; Distraction; Troubleshooting; Workload; Human-Machine Interface
Aircraft Equipment Problem Less Severe
Flight Crew Overcame Equipment Problem
Aircraft; Environment - Non Weather Related
Descending on the RYTHM4 to MSY through 6;000 feet; we got an audible warning of gear position disagreement along with gear position disagreement lights. The warning was intermittent.  We also noticed that the First Officer's Radio Altimeter was erratically indicating low altitudes below 1;000 feet; while Captain's Radio altimeter was blank as normal.  The intermittent false indications continued until the landing gear was lowered at 3;000 ft.  I made an electronic log book entry and contacted Maintenance.  Full diagnostics were completed on the aircraft with no faults recorded.  This sort of erroneous warning indications would be extremely distracting in a more challenging environment such as low visibility; icing conditions; etc.
Pilot reported during arrival to MSY the gear position disagreement lights illuminated and aural warning occurred and continued until landing gear was lowered. The First Officer's Radio Altimeter had erratic indications.