Narrative:

While working local control 1 and local control 2 combined at las tower; I received notification from las vegas TRACON L30 that the mead and daggot sectors are combined. I passed this information on to other personnel in the tower (las) and was told that it had already been done. I then inquired to the daggot sector on why they re-coordination the sectors being combined. The reply was that an aircraft had come over on the wrong departure frequency. The next aircraft that checked in with the tower was on the wrong frequency. I then coordination with the appropriate sector to inform them of the correct frequency. Within 2 or 3 mins another aircraft checked in with the tower on the wrong frequency. This is not the first time that this has happened in las vegas. The management at las vegas tower has been informed; but has failed to follow up on the other incidents. It is my belief that las vegas TRACON (L30) is intentionally issuing the incorrect tower frequency. This is a safety issue that should be investigated and addressed immediately. Unnecessary frequency changes during a critical phase of flight are dangerous.

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Original NASA ASRS Text

Title: LAS TWR CTLR VOICED CONCERN REGARDING POSSIBLE INTENTIONAL WRONG TWR FREQ ASSIGNMENTS BY L30 CTLRS; ALLEGING SAFETY CONCERNS.

Narrative: WHILE WORKING LCL CTL 1 AND LCL CTL 2 COMBINED AT LAS TWR; I RECEIVED NOTIFICATION FROM LAS VEGAS TRACON L30 THAT THE MEAD AND DAGGOT SECTORS ARE COMBINED. I PASSED THIS INFO ON TO OTHER PERSONNEL IN THE TWR (LAS) AND WAS TOLD THAT IT HAD ALREADY BEEN DONE. I THEN INQUIRED TO THE DAGGOT SECTOR ON WHY THEY RE-COORD THE SECTORS BEING COMBINED. THE REPLY WAS THAT AN ACFT HAD COME OVER ON THE WRONG DEP FREQ. THE NEXT ACFT THAT CHKED IN WITH THE TWR WAS ON THE WRONG FREQ. I THEN COORD WITH THE APPROPRIATE SECTOR TO INFORM THEM OF THE CORRECT FREQ. WITHIN 2 OR 3 MINS ANOTHER ACFT CHKED IN WITH THE TWR ON THE WRONG FREQ. THIS IS NOT THE FIRST TIME THAT THIS HAS HAPPENED IN LAS VEGAS. THE MGMNT AT LAS VEGAS TWR HAS BEEN INFORMED; BUT HAS FAILED TO FOLLOW UP ON THE OTHER INCIDENTS. IT IS MY BELIEF THAT LAS VEGAS TRACON (L30) IS INTENTIONALLY ISSUING THE INCORRECT TWR FREQ. THIS IS A SAFETY ISSUE THAT SHOULD BE INVESTIGATED AND ADDRESSED IMMEDIATELY. UNNECESSARY FREQ CHANGES DURING A CRITICAL PHASE OF FLT ARE DANGEROUS.

Data retrieved from NASA's ASRS site as of January 2009 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.