Narrative:

I was on the ramp and called approach on my cellphone to obtain my IFR clearance. I was given my clearance; told to hold for release; and to call approach when I was at the departure runway on a frequency which was to work on the ground. I was told that if the frequency did not work; to call on my cellphone. I announced on the unicom frequency that I was taxiing to runway 9 behind an aircraft. When I reached the departure runway I tried to call approach on the frequency given; but I could not reach approach so I called on my cellphone. I received an immediate release with a void time.my error was in not changing the frequency on my com radio back to unicom. I made my announcement that I was taking runway 9 with a right turn out but because I had not returned the radio to the unicom frequency I did not hear other traffic departing on runway 3 nor did anyone else hear my transmission. There was an aircraft taking off from runway 3; and I was already airborne when I saw it. The aircraft was moving from my right to my left; and I had room to takeoff behind it but the clearance between our planes was not adequate. My error was in not assuring that I had the correct unicom frequency on my com radio. It is important that pilots always check the frequency that is tuned in especially in situations like this where changes were made to the tuned frequency.

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Original NASA ASRS Text

Title: Small aircraft Pilot departed from an uncontrolled field while on the incorrect UNICOM frequency. Pilot experienced a near miss with another departing aircraft on a crossing runway.

Narrative: I was on the ramp and called Approach on my cellphone to obtain my IFR clearance. I was given my clearance; told to hold for release; and to call Approach when I was at the departure runway on a frequency which was to work on the ground. I was told that if the frequency did not work; to call on my cellphone. I announced on the UNICOM frequency that I was taxiing to runway 9 behind an aircraft. When I reached the departure runway I tried to call approach on the frequency given; but I could not reach Approach so I called on my cellphone. I received an immediate release with a void time.My error was in not changing the frequency on my com radio back to UNICOM. I made my announcement that I was taking runway 9 with a right turn out but because I had not returned the radio to the UNICOM frequency I did not hear other traffic departing on runway 3 nor did anyone else hear my transmission. There was an aircraft taking off from runway 3; and I was already airborne when I saw it. The aircraft was moving from my right to my left; and I had room to takeoff behind it but the clearance between our planes was not adequate. My error was in not assuring that I had the correct UNICOM frequency on my com radio. It is important that pilots always check the frequency that is tuned in especially in situations like this where changes were made to the tuned frequency.

Data retrieved from NASA's ASRS site 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.