A BELL 206 AIR AMBULANCE IS DIVERTED FROM A DIRECT FLT TO A HOSPITAL WITH A CRITICALLY INJURED WORKMAN WHEN THE CHIP DETECTOR LIGHT ILLUMINATES. AMBULANCE SVC PROVIDED AFTER EMER IS DECLARED AND ACFT LANDS AT THE ARPT NEAR THE CITY SERVING THAT HOSPITAL.

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WHILE ON A PUBLIC RELATIONS FLT TO ZZZ1 HOSPITAL; I RECEIVED A DISPATCH TO LNDG ZONE 1. A MIDDLE-AGED WORKER HAD FALLEN 30 FT; LNDG ON HIS HEAD. HE SUFFERED SEVERE HEAD AND CHEST INJURIES. WE WERE ON THE GND APPROX 15 MINS WHILE THE CREW STABILIZED THE PATIENT. WE THEN DEPARTED FOR HOSPITAL IN ZZZ. THE CREW INDICATED THAT HIS BLOOD PRESSURE WAS WEAKENING AND THAT THE PATIENT'S SIT WAS CRUCIAL. THE APPROX FLT TIME TO HOSPITAL WAS 30 MINS. THE PATIENT HAD BEEN VIOLENT ON THE GND AND THEREFORE; THE CREW HAD SEDATED HIM WHILE ENRTE TO THE HOSPITAL. OUR FLT PATH TOOK US NEAR ZZZ. WHILE NEARING THE ARPT; AN ENG CHIP DETECTOR LIGHT ILLUMINATED. I CHKED TO SEE IF THE LIGHT WAS FAULTY BY ROTATING THE LIGHT FROM ON TO OFF SEVERAL TIMES; BUT THE LIGHT STAYED ON. SINCE LNDG IMMEDIATELY WOULD SURELY HAVE CAUSED A SIGNIFICANT DELAY IN TREATING THE PATIENT; POSSIBLY CAUSING DEATH; I ELECTED TO DECLARE AN EMER AND LAND AT THE ZZZ ARPT. I INFORMED THE TWR OF MY SIT AND ASKED THEM TO HAVE AN AMBULANCE STANDING BY TO IMMEDIATELY TRANSPORT THE PATIENT TO HOSPITAL. THE LNDG AND AMBULANCE PICK UP WENT OFF WITHOUT A HITCH AT APPROX XA50. THE PATIENT AND CREW WERE TRANSPORTED BY GND AMBULANCE TO HOSPITAL WHERE THE PATIENT WAS STABILIZED. I NOTIFIED MY PLT SUPVR AND MAINT IMMEDIATELY. MAINT SENT A TEAM FROM ZZZ2. THE ENG WAS CHKED; THE CHIP DETECTOR WAS REPLACED AND THE ACFT WAS FLOWN BACK TO ZZZ2 WITH NO FURTHER INCIDENT.