PLT OF SMT HELI EMS OP PENETRATED THE CZN PRIOR TO OBTAINING CLRNC.

Narrative

AS I WAS APCHING ZZZ FROM SE AT 1500 FT MSL; AND WAITING FOR THE ATIS TO BECOME UNDERSTANDABLE; BEFORE REQUESTING A TRANSITION PAST ZZZ TO HOSPITAL A. AS I ARRANGED TO MED PATCH FOR THE MEDICAL CREW; I WAS SURPRISED TO FIND MYSELF WITHIN 5 NM FOR ZZZ AND ADDITIONALLY SURPRISED TO FIND ZZZ RPTING IFR. UPON UNDERSTANDING THAT ZZZ WAS IFR; I REQUESTED A SPECIAL IFR CLRNC THROUGH THE CTL ZONE TO HOSPITAL. THE REST OF THE FLT WAS UNEVENTFUL. AFTERWARDS I FOUND THAT THE 115V MEDICAL INVERTOR RESTRICTS THE RECEPTION DISTANCE OF THE #2 COM! CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. RPTR STATED THAT THE FLT NEVER ENCOUNTERED IMC; BUT HAD TO REQUEST 'SPECIAL IFR' TO TRANSITION ZZZ THAT WAS RPTING IFR. THE PLT DID DIVERT FROM ORIGINAL DEST TO HOSPITAL A; WHERE PATIENT WAS TRANSPORTED BY AMBULANCE TO DEST HOSPITAL. THE DIVERSION WAS DUE TO WORSENING WX IN DIRECTION OF DEST HOSPITAL. ADDITIONALLY MEDICAL INVERTOR THAT INTERFERED WITH #2 COM RECEPTION WAS REPLACED 10 DAYS LATER WITH LOWER VOLTAGE INVERTOR. RPTR STATED THAT HE SHOULD HAVE ANTICIPATED THE ATA BETTER BUT WX AND #2 COM INTERFERENCE DISTRACTED HIM.