Narrative:

On the afternoon of aug/xx/94, at dane county airport, madison, wi, myself and 3 passenger boarded aztec to depart for des moines, ia, around XX30 pm. My partner in the airplane had flown it into madison on jul/xx/94. We had been using our #1 navigation communication for all our radio work, which is a KX165 and our #2 navigation communication for mostly navigation and DME, which is a KX125. The reason for this is the numbers on the face of the KX125 are hard to read at an angle. In preparing for departure, I tuned into ATIS and then into clearance. Delivery on #1 communication, but did not notice that ground control was dialed into #2 communication and the transmitter switch was on #2 also. I took for granted that I was transmitting and receiving on #1 when I actually was transmitting on #2 and receiving on #1, both receivers were on. After getting clearance delivery and ground communication I taxied to runway 31 and tuned tower into #1 communication and called tower and assumed the clearance I heard was for me as I had visually checked for traffic and could see none. Ground control came back on and told me to call tower, but I had already taxied on runway and began departure. Then I heard tower tell a plane to make a 360 degree turn. Making a slight bank and looking back, I saw a cessna on final for runway 31. I checked my radio to verify the frequency and it was then I saw that my transmitter switch was on #2 communication and I rectified one of my mistakes. I was given a phone number to call when I arrived at my destination, which I did and explained my confusing and mistake. A hot cockpit and being anxious to get some air moving on my passenger, and being accustomed to using the #1 communication led to my oversight of the transmitter switches. It will be added to my checklist.

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Original NASA ASRS Text

Title: UNAUTH TKOF.

Narrative: ON THE AFTERNOON OF AUG/XX/94, AT DANE COUNTY ARPT, MADISON, WI, MYSELF AND 3 PAX BOARDED AZTEC TO DEPART FOR DES MOINES, IA, AROUND XX30 PM. MY PARTNER IN THE AIRPLANE HAD FLOWN IT INTO MADISON ON JUL/XX/94. WE HAD BEEN USING OUR #1 NAV COM FOR ALL OUR RADIO WORK, WHICH IS A KX165 AND OUR #2 NAV COM FOR MOSTLY NAV AND DME, WHICH IS A KX125. THE REASON FOR THIS IS THE NUMBERS ON THE FACE OF THE KX125 ARE HARD TO READ AT AN ANGLE. IN PREPARING FOR DEP, I TUNED INTO ATIS AND THEN INTO CLRNC. DELIVERY ON #1 COM, BUT DID NOT NOTICE THAT GND CTL WAS DIALED INTO #2 COM AND THE XMITTER SWITCH WAS ON #2 ALSO. I TOOK FOR GRANTED THAT I WAS TRANSMITTING AND RECEIVING ON #1 WHEN I ACTUALLY WAS TRANSMITTING ON #2 AND RECEIVING ON #1, BOTH RECEIVERS WERE ON. AFTER GETTING CLRNC DELIVERY AND GND COM I TAXIED TO RWY 31 AND TUNED TWR INTO #1 COM AND CALLED TWR AND ASSUMED THE CLRNC I HEARD WAS FOR ME AS I HAD VISUALLY CHKED FOR TFC AND COULD SEE NONE. GND CTL CAME BACK ON AND TOLD ME TO CALL TWR, BUT I HAD ALREADY TAXIED ON RWY AND BEGAN DEP. THEN I HEARD TWR TELL A PLANE TO MAKE A 360 DEG TURN. MAKING A SLIGHT BANK AND LOOKING BACK, I SAW A CESSNA ON FINAL FOR RWY 31. I CHKED MY RADIO TO VERIFY THE FREQ AND IT WAS THEN I SAW THAT MY XMITTER SWITCH WAS ON #2 COM AND I RECTIFIED ONE OF MY MISTAKES. I WAS GIVEN A PHONE NUMBER TO CALL WHEN I ARRIVED AT MY DEST, WHICH I DID AND EXPLAINED MY CONFUSING AND MISTAKE. A HOT COCKPIT AND BEING ANXIOUS TO GET SOME AIR MOVING ON MY PAX, AND BEING ACCUSTOMED TO USING THE #1 COM LED TO MY OVERSIGHT OF THE XMITTER SWITCHES. IT WILL BE ADDED TO MY CHKLIST.

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.