What was found
AFTER DROPPING OFF CREW AT HOSPITAL, PILOT WAS REPOSITIONING TO BASE FOR FUEL. 1 MINUTE OUT FROM LANDING AT BASE, MASTER CAUTION LIGHT AND DOOR SEGMENT LIGHT CAME ON. 2 SECONDS LATER THERE WAS A LOAD BANG, AND A/C YAWED LT AND THERE WAS SEVERE VIBRATION. AFTER PILOT ENSURED STILL HAD TAIL ROTOR AUTHORITY AND FULL CONTROL OF A/C, PILOT DECLARED EMERGENCY WITH DISPATCH AND DIVERTED TO LOCAL AIRPORT WHERE PILOT MADE EMERGENCY LANDING. PILOT INSPECTION OF A/C SHOWED LT CARGO DOOR MISSING AND DAMAGE TO MAIN AND TAIL ROTOR BLADES. A/C INSPECTED BY MX AND FOUND UPPER DOOR TRACK BENT OUT AT PINS (WHERE EMERGENCY RELEASE PINS ENGAGE). DOOR HAD SLID BACK APPROX 2.5 IN FROM LOCKED POSITION BEFORE DEPARTING AIRFRAME.