Narrative:

On climbout from the medical center; which is within the class C; I contacted approach and advised them of my position and destination. The controller came back with radar contact; the current altimeter and cleared me on course. The heading that I was using was about 220 degrees; I was following the readout on the G430 as well as the G500. This heading took me to about 2-3 miles north of the departure ends of xxl and xxr. After I was cleared on course by approach I climbed to an indicated altitude of 2400 feet for the westbound heading. As I got within two miles of the departure end of xxr I saw what appeared to be a jet on takeoff roll on xxr. I was not advised of this by either approach control or the tower. As I continued I saw this business jet lift off and immediately began a left turn and climb out. I continued to monitor the flight path of this jet; still with no traffic advisory from either approach or tower. With the appearance that there was an impending traffic conflict I immediately began a descent. I was able to descend from 2400 down to about 2000 indicated before the jet passed directly overhead at what appeared to be less than 500 feet vertical separation. I did get an indication from the G430 and G500 of a traffic advisory. It is my opinion that the pilots of this jet never saw our helicopter and I don't know if they were given traffic advisories by the tower as I was still up on approach control frequency. I never had contact with approach control again until he released me to squawk VFR and change to advisory at the outer limits of his control area. This type of event has never happened to me before; usually approach control will hand me off to the tower if there is traffic in the pattern or traffic that will be taking off in my flight path direction. I believe we needed better communication between controlling authorities and the pilots.

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Original NASA ASRS Text

Title: An EMT helicopter; crossing the departure end of a major airport runway and in radar contact with Approach Control suffered Near Mid Air Collision with a business jet departing from that runway. Approach Control provided no traffic information to either aircraft.

Narrative: On climbout from the Medical Center; which is within the Class C; I contacted Approach and advised them of my position and destination. The Controller came back with radar contact; the current altimeter and cleared me on course. The heading that I was using was about 220 degrees; I was following the readout on the G430 as well as the G500. This heading took me to about 2-3 miles north of the departure ends of XXL and XXR. After I was cleared on course by approach I climbed to an indicated altitude of 2400 feet for the westbound heading. As I got within two miles of the departure end of XXR I saw what appeared to be a jet on takeoff roll on XXR. I was not advised of this by either Approach Control or the Tower. As I continued I saw this Business Jet lift off and immediately began a left turn and climb out. I continued to monitor the flight path of this jet; still with no traffic advisory from either approach or tower. With the appearance that there was an impending traffic conflict I immediately began a descent. I was able to descend from 2400 down to about 2000 indicated before the jet passed directly overhead at what appeared to be less than 500 feet vertical separation. I did get an indication from the G430 and G500 of a traffic advisory. It is my opinion that the pilots of this jet never saw our helicopter and I don't know if they were given traffic advisories by the tower as I was still up on approach control frequency. I never had contact with approach control again until he released me to squawk VFR and change to advisory at the outer limits of his control area. This type of event has never happened to me before; usually approach control will hand me off to the tower if there is traffic in the pattern or traffic that will be taking off in my flight path direction. I believe we needed better communication between controlling authorities and the pilots.

Data retrieved from NASA's ASRS site as of April 2012 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.