Narrative:

On 04/fri/02, I was landing to a full stop on runway 05 at laf (purdue university airport) after a series of touch and go's. The pattern and frequency was extremely congested and the tower transmission were sometimes garbled and hard to hear. After landing on runway 05, I heard another garbled instruction. I believe I heard my instruction was to make a turn onto runway 10-28 and them to exit on charlie 1, contact ground on 'point niner.' I turned onto the runway and thought I was to turn onto charlie 1. After I missed the bravo intersection tower had informed me that I had missed my turnoff off the runway and to contact ground on 121.9. Upon exiting off runway 10-28 I contact ground and I was asked to call the tower once inside the FBO. During my conversation with the tower I was informed that tower was having maintenance trouble with their radio xmissions and was going to 'pull the tapes' to help their point of needing funding for tower radio repairs. I was also informed that the mis-communication regarding which exit point off the runway was going to be considered an 'incursion.' I am a 1700 hour flight instructor who has been teaching out of the laf airport daily for the last two yrs. Laf is also considered a 'training airport' because of the high volume of training flts that take place. Because of this truism, there are frequent mis-communications with student pilots and student controllers. I believe that having tower radios that should have been transmitting properly and less congestion in the delta surface area could have prevented this 'incursion.'

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Original NASA ASRS Text

Title: RWY INCURSION WHEN A LONE CFI IN HIS SMA ACFT MISSES A TURN OFF ON AN ACTIVE RWY DURING AN ATC FAC XMISSION PROB AT LAF, IN.

Narrative: ON 04/FRI/02, I WAS LNDG TO A FULL STOP ON RWY 05 AT LAF (PURDUE UNIVERSITY ARPT) AFTER A SERIES OF TOUCH AND GO'S. THE PATTERN AND FREQUENCY WAS EXTREMELY CONGESTED AND THE TWR TRANSMISSION WERE SOMETIMES GARBLED AND HARD TO HEAR. AFTER LNDG ON RWY 05, I HEARD ANOTHER GARBLED INSTRUCTION. I BELIEVE I HEARD MY INSTRUCTION WAS TO MAKE A TURN ONTO RWY 10-28 AND THEM TO EXIT ON CHARLIE 1, CONTACT GND ON 'POINT NINER.' I TURNED ONTO THE RWY AND THOUGHT I WAS TO TURN ONTO CHARLIE 1. AFTER I MISSED THE BRAVO INTERSECTION TWR HAD INFORMED ME THAT I HAD MISSED MY TURNOFF OFF THE RWY AND TO CONTACT GND ON 121.9. UPON EXITING OFF RWY 10-28 I CONTACT GND AND I WAS ASKED TO CALL THE TWR ONCE INSIDE THE FBO. DURING MY CONVERSATION WITH THE TWR I WAS INFORMED THAT TWR WAS HAVING MAINT TROUBLE WITH THEIR RADIO XMISSIONS AND WAS GOING TO 'PULL THE TAPES' TO HELP THEIR POINT OF NEEDING FUNDING FOR TWR RADIO REPAIRS. I WAS ALSO INFORMED THAT THE MIS-COM REGARDING WHICH EXIT POINT OFF THE RWY WAS GOING TO BE CONSIDERED AN 'INCURSION.' I AM A 1700 HR FLT INSTRUCTOR WHO HAS BEEN TEACHING OUT OF THE LAF ARPT DAILY FOR THE LAST TWO YRS. LAF IS ALSO CONSIDERED A 'TRAINING ARPT' BECAUSE OF THE HIGH VOLUME OF TRAINING FLTS THAT TAKE PLACE. BECAUSE OF THIS TRUISM, THERE ARE FREQUENT MIS-COMS WITH STUDENT PLTS AND STUDENT CTLRS. I BELIEVE THAT HAVING TWR RADIOS THAT SHOULD HAVE BEEN XMITTING PROPERLY AND LESS CONGESTION IN THE DELTA SURFACE AREA COULD HAVE PREVENTED THIS 'INCURSION.'

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.