Sighted traffic lost in air traffic area. Near midair collision.

Attributes
ACN	239256
Time
Date	199304
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz
State Reference	US
Altitude	msl bound lower : 2000 msl bound upper : 2000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : zzz
Operator	other
Make Model Name	Helicopter
Flight Phase	climbout : intermediate altitude
Route In Use	enroute : direct
Flight Plan	None
Aircraft 2
Operator	general aviation : personal
Make Model Name	Small Transport, Low Wing, 2 Recip Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : single pilot
Qualification	pilot : commercial pilot : cfi
Experience	flight time last 90 days : 50 flight time total : 3000 flight time type : 110
ASRS Report	239256
Person 2
Affiliation	Other
Function	observation : observer
Qualification	other other : other
Events
Anomaly	conflict : nmac non adherence : far
Independent Detector	other controllera other flight crewa other other : unspecified
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	horizontal : 50 vertical : 250
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

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.

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.