A BA4100 ON FINAL APCH AT 1000 FT MADE A GAR DUE TO THE LNDG GEAR WARNING HORN SOUNDING WITH 3 GREEN DOWN AND LOCK INDICATIONS CAUSED BY A LOOSE NOSE GEAR SENSOR CONNECTOR.

Narrative

ON DSCNT FOR LNDG ON RWY 31R INTO JFK; UPON SELECTING THE GEAR DOWN; WE GOT THE 3 GREEN LIGHTS ON THE TWIN INDICATION; BUT THEN THE GEAR HORN CAME ON. WE ALSO HAVE A STANDBY GEAR INDICATION; THAT SHOWED US THAT OUR NOSE GEAR WAS NOT DOWN AND LOCKED. WE IMMEDIATELY INITIATED A GAR. ATC ADVISED THAT WE COULD DO SLOW PASS OVER REPUBLIC; FARMINGDALE FOR THEM TO HAVE A LOOK AT OUR NOSE GEAR. WE DID THAT; AND ATC IN FARMINGDALE NOTED THAT THE NOSE GEAR APPEARED TO BE DOWN BUT SLIGHTLY BENT BACKWARDS ABOUT 2 DEGS. AFTER TALKING TO OUR MAINT DEPT; WE TRIED A FEW OTHER THINGS. WE GOT PERMISSION FROM ATC TO DO 2 LOW PASSES OVER JFK RWY 4L WHICH CLOSED WITH OUR MAINT PERSONNEL STANDING BY ON THE SIDE OF THE RWY; TO GIVE THEIR OPINION ON THE PROB AT HAND. ONE OF THE CHKLIST ITEM WAS TO BURN OFF FUEL AS MUCH AS POSSIBLE. WE HAD A LOT OF GAS. WE ELECTED TO FLY FOR 1 HR 45 MINS TO REACH A COMFORTABLE FUEL LEVEL FOR LNDG. ALL THAT TIME GAVE US TIME TO TRY A LOT OF DIFFERENT STRATEGIES. WE HAD TIME TO BRIEF THE PAX FOR AN OCCASIONAL NOSE GEAR COLLAPSE ON LNDG. WHEN OUR TIME CAME UP; WE WERE GIVEN RWY 4R; WITH CALM WIND. WE LANDED UNEVENTFULLY; THE NOSE GEAR DID REMAIN IN PLACE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE BA4100 HAS 2 SEPARATE LNDG GEAR POS AND WARNING SYS; A PRIMARY AND A SECONDARY. THE RPTR SAID THE LNDG GEAR PRIMARY SYS INDICATED 3 GREEN DOWN AND LOCKED; BUT THE SECONDARY INDICATED NOSE GEAR UNSAFE AND SOUNDED THE WARNING HORN. THE RPTR SAID THE PROB WAS A NOSE GEAR SENSOR CONNECTOR FOUND LOOSE.