Narrative:

While working ground control, cessna called ready to taxi from one of the FBO's. I issued taxi instructions as 'taxi to runway 30L, intersection M,' without a specific route for the aircraft since he was on the ramp facing a 'preferred' taxi route that would not have allowed him to cross any of the active runways. I observed the aircraft turn on the ramp to a taxiway that would have allowed him to cross a runway. I immediately issued a taxi route and a restr to hold short of the first taxiway while he was still on the ramp. The aircraft did not acknowledge my transmission, nor the 8 attempts to contact him. He subsequently crossed the active runway with a tampico on final that had been cleared for a touch and go. Loss of separation occurred as the tampico crossed the threshold as the cessna was crossing at the departure end of the runway. Specific taxi route instructions would have been one of the possible remedies and or hold short instructions. The pilot in compliance with far 91.129 maintaining communication with ATC while in the class D and on the airport would have been the prime solution from my perspective. Once the aircraft had reached the intended runway of departure, he called the tower ready for departure. He did not hear the tower's reply (which was the 9TH ATC communication he missed). He called the tower again, and acknowledged the tower's instruction to contact ground control. It has the appearance the pilot possibly turned his radio back up after calling the tower the second time, as communications were fine on the tower and ground frequency after that.

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Original NASA ASRS Text

Title: CPS CTLR CHRONICLED LOSS OF SEPARATION DURING TAXI EVENT, DUE TO PLT ERROR.

Narrative: WHILE WORKING GND CTL, CESSNA CALLED READY TO TAXI FROM ONE OF THE FBO'S. I ISSUED TAXI INSTRUCTIONS AS 'TAXI TO RWY 30L, INTXN M,' WITHOUT A SPECIFIC RTE FOR THE ACFT SINCE HE WAS ON THE RAMP FACING A 'PREFERRED' TAXI RTE THAT WOULD NOT HAVE ALLOWED HIM TO CROSS ANY OF THE ACTIVE RWYS. I OBSERVED THE ACFT TURN ON THE RAMP TO A TXWY THAT WOULD HAVE ALLOWED HIM TO CROSS A RWY. I IMMEDIATELY ISSUED A TAXI RTE AND A RESTR TO HOLD SHORT OF THE FIRST TXWY WHILE HE WAS STILL ON THE RAMP. THE ACFT DID NOT ACKNOWLEDGE MY XMISSION, NOR THE 8 ATTEMPTS TO CONTACT HIM. HE SUBSEQUENTLY CROSSED THE ACTIVE RWY WITH A TAMPICO ON FINAL THAT HAD BEEN CLRED FOR A TOUCH AND GO. LOSS OF SEPARATION OCCURRED AS THE TAMPICO CROSSED THE THRESHOLD AS THE CESSNA WAS XING AT THE DEP END OF THE RWY. SPECIFIC TAXI RTE INSTRUCTIONS WOULD HAVE BEEN ONE OF THE POSSIBLE REMEDIES AND OR HOLD SHORT INSTRUCTIONS. THE PLT IN COMPLIANCE WITH FAR 91.129 MAINTAINING COM WITH ATC WHILE IN THE CLASS D AND ON THE ARPT WOULD HAVE BEEN THE PRIME SOLUTION FROM MY PERSPECTIVE. ONCE THE ACFT HAD REACHED THE INTENDED RWY OF DEP, HE CALLED THE TWR READY FOR DEP. HE DID NOT HEAR THE TWR'S REPLY (WHICH WAS THE 9TH ATC COM HE MISSED). HE CALLED THE TWR AGAIN, AND ACKNOWLEDGED THE TWR'S INSTRUCTION TO CONTACT GND CTL. IT HAS THE APPEARANCE THE PLT POSSIBLY TURNED HIS RADIO BACK UP AFTER CALLING THE TWR THE SECOND TIME, AS COMS WERE FINE ON THE TWR AND GND FREQ AFTER THAT.

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.