Narrative:

Small transport cleared for visual approach to runway 12 at cys. Told to contact tower 5 mi northwest. Copilot called tower. Tower controller said to report 2 mi final for runway 12. When copilot called a 2 mi final, tower controller said to continue. Controller evidently cleared 2 construction vehicles to cross runway 12. Both vehicles moved very slowly. As we crossed the threshold, last vehicle was 3/4 across runway. Still not cleared to land, but expected clearance. While in landing attitude, and ground vehicle clear of runway edge, controller called us, but transmission was unintelligible. I landed the airplane without incident. During rollout, I asked tower controller if we were cleared to land, but controller transmission was still unintelligible. I believe the controller should have issued a go around command when a possible conflict existed, or I should have made a go around as a precaution when the landing clearance was not issued prior to crossing the threshold. (The radio equipment at the cys ATCT is old and very low output due to wattage loss. Pilots have to double the volume on their receivers to adequately hear ATC xmissions. Other xmissions -- ZDV and other aircraft -- come in loud and clear.)

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Original NASA ASRS Text

Title: SMT LANDED ON OCCUPIED RWY WITHOUT CLRNC. HAD LTSS FROM VEHICLE. SYS ERROR. PLTDEV.

Narrative: SMT CLRED FOR VISUAL APCH TO RWY 12 AT CYS. TOLD TO CONTACT TWR 5 MI NW. COPLT CALLED TWR. TWR CTLR SAID TO RPT 2 MI FINAL FOR RWY 12. WHEN COPLT CALLED A 2 MI FINAL, TWR CTLR SAID TO CONTINUE. CTLR EVIDENTLY CLRED 2 CONSTRUCTION VEHICLES TO CROSS RWY 12. BOTH VEHICLES MOVED VERY SLOWLY. AS WE CROSSED THE THRESHOLD, LAST VEHICLE WAS 3/4 ACROSS RWY. STILL NOT CLRED TO LAND, BUT EXPECTED CLRNC. WHILE IN LNDG ATTITUDE, AND GND VEHICLE CLR OF RWY EDGE, CTLR CALLED US, BUT XMISSION WAS UNINTELLIGIBLE. I LANDED THE AIRPLANE WITHOUT INCIDENT. DURING ROLLOUT, I ASKED TWR CTLR IF WE WERE CLRED TO LAND, BUT CTLR XMISSION WAS STILL UNINTELLIGIBLE. I BELIEVE THE CTLR SHOULD HAVE ISSUED A GAR COMMAND WHEN A POSSIBLE CONFLICT EXISTED, OR I SHOULD HAVE MADE A GAR AS A PRECAUTION WHEN THE LNDG CLRNC WAS NOT ISSUED PRIOR TO XING THE THRESHOLD. (THE RADIO EQUIP AT THE CYS ATCT IS OLD AND VERY LOW OUTPUT DUE TO WATTAGE LOSS. PLTS HAVE TO DOUBLE THE VOLUME ON THEIR RECEIVERS TO ADEQUATELY HEAR ATC XMISSIONS. OTHER XMISSIONS -- ZDV AND OTHER ACFT -- COME IN LOUD AND CLR.)

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.