Narrative:

Landing/departing runway 13. Less than 10 aircraft on frequency. Numerous xmissions blocked/stepped on due to poor radio discipline by pilots. C172 1/2 mi north of field heading southwest directly at aircraft on 1 mi final, makes following transmission: 'tower, cessna, I'm on base, what's my sequence?' (first call). I issued turn instructions to avoid conflict and asked C172 his intentions (full stop, touch-and-go, etc). C172 said he already told me he was full stop. I told him the first call I received was his call from base. C172 said he called crossing the shoreline (8 mi east) and over standard VFR reporting point 3 mi east. I received neither call, as they were most likely blocked. C172 obviously received no acknowledgement, and entered class D airspace without establishing 2-WAY communications. At least 1 other aircraft on frequency at the time admitted to making initial call with volume turned down. Recommendations for correction: place greater emphasis on good radio discipline during early stages of flight training. Reinforce with pilots the requirement to establish and maintain 2-WAY communication before entering the airspace. Far too many xmissions are being stepped on by pilots who turn down their radio volume or are simply not listening.

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Original NASA ASRS Text

Title: PLT FLYING INTO TMB RPTS ON BASE LEG REQUESTING SEQUENCE. PLT STATES HIS INITIAL CALL WAS 8 MI AWAY. CTLR BELIEVES HIS XMISSION MAY HAVE BEEN BLOCKED.

Narrative: LNDG/DEPARTING RWY 13. LESS THAN 10 ACFT ON FREQ. NUMEROUS XMISSIONS BLOCKED/STEPPED ON DUE TO POOR RADIO DISCIPLINE BY PLTS. C172 1/2 MI N OF FIELD HDG SW DIRECTLY AT ACFT ON 1 MI FINAL, MAKES FOLLOWING XMISSION: 'TWR, CESSNA, I'M ON BASE, WHAT'S MY SEQUENCE?' (FIRST CALL). I ISSUED TURN INSTRUCTIONS TO AVOID CONFLICT AND ASKED C172 HIS INTENTIONS (FULL STOP, TOUCH-AND-GO, ETC). C172 SAID HE ALREADY TOLD ME HE WAS FULL STOP. I TOLD HIM THE FIRST CALL I RECEIVED WAS HIS CALL FROM BASE. C172 SAID HE CALLED XING THE SHORELINE (8 MI E) AND OVER STANDARD VFR RPTING POINT 3 MI E. I RECEIVED NEITHER CALL, AS THEY WERE MOST LIKELY BLOCKED. C172 OBVIOUSLY RECEIVED NO ACKNOWLEDGEMENT, AND ENTERED CLASS D AIRSPACE WITHOUT ESTABLISHING 2-WAY COMS. AT LEAST 1 OTHER ACFT ON FREQ AT THE TIME ADMITTED TO MAKING INITIAL CALL WITH VOLUME TURNED DOWN. RECOMMENDATIONS FOR CORRECTION: PLACE GREATER EMPHASIS ON GOOD RADIO DISCIPLINE DURING EARLY STAGES OF FLT TRAINING. REINFORCE WITH PLTS THE REQUIREMENT TO ESTABLISH AND MAINTAIN 2-WAY COM BEFORE ENTERING THE AIRSPACE. FAR TOO MANY XMISSIONS ARE BEING STEPPED ON BY PLTS WHO TURN DOWN THEIR RADIO VOLUME OR ARE SIMPLY NOT LISTENING.

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.