Narrative:

On departure from ZZZ airport at approximately XY10, I had a near near midair collision while flying. We had a patient on board ('lifeguard' status) and the WX was VFR (clear, visibility greater than 10 mi). After taking off straight out runway 31, I remember hearing tower give another aircraft (who'd apparently taken off runway 26) my position, and he replied that he had me in sight. I can't remember if tower advised me of his position -- I don't think so. About 2 min later my flight nurse (in the back) called traffic at our 8 or 9 O'clock position. I saw a twin about 1/4 mi away climbing and turning (gradually) into me from my left. Expecting that this was the guy who 'had me in sight' I held course in a slight climb at roughly 2000 ft) and questioned tower about him. They advised me he'd switched to departure. So I started a descent before he crossed right over me approximately 200-300 ft above us. The time from when I first spotted him until he passed overhead was approximately 20 seconds. Callback conversation with reporter revealed the following information: reporter states patient was on board for an interfacility transfer but did not influence pilot's decision processes or contribute to incident.

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Original NASA ASRS Text

Title: SIGHTED TFC LOST IN ATA. NMAC.

Narrative: ON DEP FROM ZZZ ARPT AT APPROX XY10, I HAD A NEAR NMAC WHILE FLYING. WE HAD A PATIENT ON BOARD ('LIFEGUARD' STATUS) AND THE WX WAS VFR (CLR, VISIBILITY GREATER THAN 10 MI). AFTER TAKING OFF STRAIGHT OUT RWY 31, I REMEMBER HEARING TWR GIVE ANOTHER ACFT (WHO'D APPARENTLY TAKEN OFF RWY 26) MY POS, AND HE REPLIED THAT HE HAD ME IN SIGHT. I CAN'T REMEMBER IF TWR ADVISED ME OF HIS POS -- I DON'T THINK SO. ABOUT 2 MIN LATER MY FLT NURSE (IN THE BACK) CALLED TFC AT OUR 8 OR 9 O'CLOCK POS. I SAW A TWIN ABOUT 1/4 MI AWAY CLBING AND TURNING (GRADUALLY) INTO ME FROM MY L. EXPECTING THAT THIS WAS THE GUY WHO 'HAD ME IN SIGHT' I HELD COURSE IN A SLIGHT CLB AT ROUGHLY 2000 FT) AND QUESTIONED TWR ABOUT HIM. THEY ADVISED ME HE'D SWITCHED TO DEP. SO I STARTED A DSCNT BEFORE HE CROSSED RIGHT OVER ME APPROX 200-300 FT ABOVE US. THE TIME FROM WHEN I FIRST SPOTTED HIM UNTIL HE PASSED OVERHEAD WAS APPROX 20 SECONDS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES PATIENT WAS ON BOARD FOR AN INTERFACILITY TRANSFER BUT DID NOT INFLUENCE PLT'S DECISION PROCESSES OR CONTRIBUTE TO INCIDENT.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.