An small transport and another small transport had an near midair collision after departing opl when the small transport pilot heard calls on the CTAF frequency but transmitted responses on another radio frequency.

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Attributes
ACN	808733
Time
Date	200810
Place
Locale Reference	airport : opl.airport
State Reference	CA
Altitude	msl single value : 900
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : lax.tower
Make Model Name	Small Transport Low Wing 2 Turboprop Eng
Flight Phase	climbout : initial
Flight Plan	IFR
Aircraft 2
Operator	general aviation : instructional
Make Model Name	Small Aircraft Low Wing 1 Eng Fixed Gear
Flight Phase	descent : approach
Flight Plan	VFR
Person 1
Qualification	pilot : atp
Experience	flight time last 90 days : 85 flight time total : 5025 flight time type : 350
ASRS Report	808733
Person 2
Affiliation	other
Function	flight crew : single pilot
Events
Anomaly	conflict : nmac non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Miss Distance	horizontal : 2 vertical : 400
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft Airport
Primary Problem	Flight Crew Human Performance

Narrative:

Departed VFR from opl runway 36 while the other small transport aircraft was on an upwind from runway 6. I made all appropriate radio calls and then on my climb out the other small transport aircraft asked my intentions; so I restated departure to the north. The other small transport had turned a left crosswind and then stated they were going to execute a turn back to the right to avoid me. At the same time I stated I was turning due west and remained at approximately 900 ft indicated. The radio calls seemed as if they partially blocked one another. I then contacted approach on my #1 radio and heard the other small transport talking to another aircraft in the pattern stating they never heard any calls from me. I called back to the piper and stated I had been making xmissions. They responded that was the first time they heard me. Apparently I wasn't transmitting on the #2 radio but actually on the #1 radio. A way to alleviate this scenario from happening again I will no longer transmit on the #2 radio; but instead remain on the #1 and just toggle between the #1 radio.

Original NASA ASRS Text

Title: AN SMT AND ANOTHER SMT HAD AN NMAC AFTER DEPARTING OPL WHEN THE SMT PLT HEARD CALLS ON THE CTAF FREQ BUT TRANSMITTED RESPONSES ON ANOTHER RADIO FREQ.

Narrative: DEPARTED VFR FROM OPL RWY 36 WHILE THE OTHER SMT ACFT WAS ON AN UPWIND FROM RWY 6. I MADE ALL APPROPRIATE RADIO CALLS AND THEN ON MY CLBOUT THE OTHER SMT ACFT ASKED MY INTENTIONS; SO I RESTATED DEP TO THE N. THE OTHER SMT HAD TURNED A L XWIND AND THEN STATED THEY WERE GOING TO EXECUTE A TURN BACK TO THE R TO AVOID ME. AT THE SAME TIME I STATED I WAS TURNING DUE W AND REMAINED AT APPROX 900 FT INDICATED. THE RADIO CALLS SEEMED AS IF THEY PARTIALLY BLOCKED ONE ANOTHER. I THEN CONTACTED APCH ON MY #1 RADIO AND HEARD THE OTHER SMT TALKING TO ANOTHER ACFT IN THE PATTERN STATING THEY NEVER HEARD ANY CALLS FROM ME. I CALLED BACK TO THE PIPER AND STATED I HAD BEEN MAKING XMISSIONS. THEY RESPONDED THAT WAS THE FIRST TIME THEY HEARD ME. APPARENTLY I WASN'T XMITTING ON THE #2 RADIO BUT ACTUALLY ON THE #1 RADIO. A WAY TO ALLEVIATE THIS SCENARIO FROM HAPPENING AGAIN I WILL NO LONGER XMIT ON THE #2 RADIO; BUT INSTEAD REMAIN ON THE #1 AND JUST TOGGLE BTWN THE #1 RADIO.

Data retrieved from NASA's ASRS site as of May 2009 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.