Narrative:

This occurrence happened while taxiing the cessna 340 XXX from the area where we hangar the aircraft on ramp C to the southeast ramp where we keep our offices. I taxied with a clearance off ramp C on taxiway C up to and held short of runway 31. I waited anxiously for about 6-8 mins while I watched 2 cessna 172's doing touch-and-goes from a flight school on our airport. I said to the tower 'this is twin cessna XXX, I will be a lifeguard flight out. I need to get to the southeast ramp.' during this time the first C-172 had landed and was parked on the other side of the runway on taxiway C, I supposed doing their after landing checklist. The ground controller replied 'taxi up behind the cessna, hold short. I replied 'XXX, thanks' and added about 50-60 percent power and briskly crossed the runway noticing the second C-172 on a right base about 1 1/2 mi from the airport. After crossing the cessna in front of me, taxied and all was quiet. I sat there for about 30 seconds and said 'XXX, may I taxi to the southeast ramp.' the controller responded 'XXX, taxi to the ramp.' after loading up, I filed for my lifeguard part 135 air taxi flight and myself and the flight nurse got in the aircraft and headed out for departure. On tower I was given a phone number and asked to call the tower when I got to my destination. About 1 1/2 hours later, I called and spoke with the tower chief on duty. He was not very happy. During our phone conversation I found out that when I heard 'taxi up behind the cessna, hold short' I replied 'XXX, thanks' and added a lot of power to scoot me across. During this time the controller (according to the tower chief) was exclaiming over the radio, hold short, hold short, because I was not using a head set and was working over the speaker in the ceiling of the aircraft and had all of that power added. With all of the noise I couldn't hear her desperate calls to me. When I arrived on the other side with the power at idle, I could then hear the radio and couldn't understand why she hadn't cleared me to the ramp. I was oblivious to the fact that there was a runway incursion. These were the problems as I see them: I should have been wearing my head set so I could hear the radio more clearly and I should not have been so anxious for my crossing clearance because I heard something different than was really said to me.

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Original NASA ASRS Text

Title: UNAUTH RWY XING. PLT USED OVERHEAD SPEAKERS AND COULD NOT HEAR OVER THE ENG NOISE.

Narrative: THIS OCCURRENCE HAPPENED WHILE TAXIING THE CESSNA 340 XXX FROM THE AREA WHERE WE HANGAR THE ACFT ON RAMP C TO THE SE RAMP WHERE WE KEEP OUR OFFICES. I TAXIED WITH A CLRNC OFF RAMP C ON TXWY C UP TO AND HELD SHORT OF RWY 31. I WAITED ANXIOUSLY FOR ABOUT 6-8 MINS WHILE I WATCHED 2 CESSNA 172'S DOING TOUCH-AND-GOES FROM A FLT SCHOOL ON OUR ARPT. I SAID TO THE TWR 'THIS IS TWIN CESSNA XXX, I WILL BE A LIFEGUARD FLT OUT. I NEED TO GET TO THE SE RAMP.' DURING THIS TIME THE FIRST C-172 HAD LANDED AND WAS PARKED ON THE OTHER SIDE OF THE RWY ON TXWY C, I SUPPOSED DOING THEIR AFTER LNDG CHKLIST. THE GND CTLR REPLIED 'TAXI UP BEHIND THE CESSNA, HOLD SHORT. I REPLIED 'XXX, THANKS' AND ADDED ABOUT 50-60 PERCENT PWR AND BRISKLY CROSSED THE RWY NOTICING THE SECOND C-172 ON A R BASE ABOUT 1 1/2 MI FROM THE ARPT. AFTER XING THE CESSNA IN FRONT OF ME, TAXIED AND ALL WAS QUIET. I SAT THERE FOR ABOUT 30 SECONDS AND SAID 'XXX, MAY I TAXI TO THE SE RAMP.' THE CTLR RESPONDED 'XXX, TAXI TO THE RAMP.' AFTER LOADING UP, I FILED FOR MY LIFEGUARD PART 135 AIR TAXI FLT AND MYSELF AND THE FLT NURSE GOT IN THE ACFT AND HEADED OUT FOR DEP. ON TWR I WAS GIVEN A PHONE NUMBER AND ASKED TO CALL THE TWR WHEN I GOT TO MY DEST. ABOUT 1 1/2 HRS LATER, I CALLED AND SPOKE WITH THE TWR CHIEF ON DUTY. HE WAS NOT VERY HAPPY. DURING OUR PHONE CONVERSATION I FOUND OUT THAT WHEN I HEARD 'TAXI UP BEHIND THE CESSNA, HOLD SHORT' I REPLIED 'XXX, THANKS' AND ADDED A LOT OF PWR TO SCOOT ME ACROSS. DURING THIS TIME THE CTLR (ACCORDING TO THE TWR CHIEF) WAS EXCLAIMING OVER THE RADIO, HOLD SHORT, HOLD SHORT, BECAUSE I WAS NOT USING A HEAD SET AND WAS WORKING OVER THE SPEAKER IN THE CEILING OF THE ACFT AND HAD ALL OF THAT PWR ADDED. WITH ALL OF THE NOISE I COULDN'T HEAR HER DESPERATE CALLS TO ME. WHEN I ARRIVED ON THE OTHER SIDE WITH THE PWR AT IDLE, I COULD THEN HEAR THE RADIO AND COULDN'T UNDERSTAND WHY SHE HADN'T CLRED ME TO THE RAMP. I WAS OBLIVIOUS TO THE FACT THAT THERE WAS A RWY INCURSION. THESE WERE THE PROBS AS I SEE THEM: I SHOULD HAVE BEEN WEARING MY HEAD SET SO I COULD HEAR THE RADIO MORE CLRLY AND I SHOULD NOT HAVE BEEN SO ANXIOUS FOR MY XING CLRNC BECAUSE I HEARD SOMETHING DIFFERENT THAN WAS REALLY SAID TO ME.

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.