A CL65 REGIONAL JET CLBING THROUGH FL240 DECLARED AN EMER AND DIVERTED DUE TO A PAX DOOR WARNING CAUSED BY A DEFECTIVE DOOR SENSING SYS.

Narrative

WHILE CLBING THROUGH FL240; A PAX DOOR STOW CAUTION MESSAGE WAS NOTED AND THE QRH CHKLIST PROC WAS APPLIED. SHORTLY THEREAFTER; A PAX DOOR WARNING MESSAGE WAS NOTED AND THE QRH CHKLIST PROC WAS APPLIED. THIS RESULTED IN DECLARING AN EMER AND APPLYING EMER DSCNT CHKLIST PROCS. THE PAX WERE NOTIFIED AND THE FLT PROCEEDED BACK TO COS AND LANDED SAFELY WITHOUT INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE QRH ON DOOR WARNING REQUIRES EMER DSCNT AND DEPRESSURIZATION OF THE ACFT. THE RPTR SAID THE AIRPLANE HAS A CHRONIC HISTORY OF DOOR WARNING PROBS. THE WARNING NORMALLY SHOULD BE A PAX DOOR WARNING LIGHT THEN FOLLOWED BY THE MASTER CAUTION LIGHT. THE RPTR SAID THE ACTUAL WARNING VARIES -- ONE TIME A MASTER CAUTION LIGHT AND MAYBE A PAX DOOR WARNING AND OTHER TIMES BOTH WARNINGS IN ANY ORDER. THE RPTR STATED THE WARNING CANNOT BE IGNORED AS THE DOOR IS NOT A PLUG TYPE DOOR. THE RPTR SAID THE COMPANY IS WORKING WITH THE FAA AND THE MANUFACTURER TO GET A MORE RELIABLE SYS.