Narrative:

Approaching las from over gcn at FL310, we attempted to contact las operations to give our in-range call. We were 140 NM east of las, approaching top of descent. We were unable to complete our call without numerous tries, because at that location and altitude we could also hear phx (company) ramp control and aircraft on the ground at phx. I assume that our call to las was blocking the phx frequency, as well as them blocking us. I had to abandon the effort, make the cabin PA without gate information, call las operations back at a lower altitude, and then make another PA to inform the passenger about our arrival gate and unscheduled aircraft change. This required me to be off the ATC radio during the descent until almost reaching FL180. This increases the PF's workload, and reduces safety. This is a common occurrence when approaching las from the east, and the issue is particularly bad during a phx bank movement. I have recommended to our company that they look into getting a frequency for las operations that is different from any of the phx frequencys. I frankly don't expect them to take action, as I have written similar reports about this issue over many yrs, with no results.

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Original NASA ASRS Text

Title: A B757-200 PIC RPT ON A FREQ OVERLAP AND SIMULTANEOUS XMISSION PROBS BTWN COMPANY RAMP CTL AT PHX AND COMPANY OPS AT LAS, NV.

Narrative: APCHING LAS FROM OVER GCN AT FL310, WE ATTEMPTED TO CONTACT LAS OPS TO GIVE OUR IN-RANGE CALL. WE WERE 140 NM E OF LAS, APCHING TOP OF DSCNT. WE WERE UNABLE TO COMPLETE OUR CALL WITHOUT NUMEROUS TRIES, BECAUSE AT THAT LOCATION AND ALT WE COULD ALSO HEAR PHX (COMPANY) RAMP CTL AND ACFT ON THE GND AT PHX. I ASSUME THAT OUR CALL TO LAS WAS BLOCKING THE PHX FREQ, AS WELL AS THEM BLOCKING US. I HAD TO ABANDON THE EFFORT, MAKE THE CABIN PA WITHOUT GATE INFO, CALL LAS OPS BACK AT A LOWER ALT, AND THEN MAKE ANOTHER PA TO INFORM THE PAX ABOUT OUR ARR GATE AND UNSCHEDULED ACFT CHANGE. THIS REQUIRED ME TO BE OFF THE ATC RADIO DURING THE DSCNT UNTIL ALMOST REACHING FL180. THIS INCREASES THE PF'S WORKLOAD, AND REDUCES SAFETY. THIS IS A COMMON OCCURRENCE WHEN APCHING LAS FROM THE E, AND THE ISSUE IS PARTICULARLY BAD DURING A PHX BANK MOVEMENT. I HAVE RECOMMENDED TO OUR COMPANY THAT THEY LOOK INTO GETTING A FREQ FOR LAS OPS THAT IS DIFFERENT FROM ANY OF THE PHX FREQS. I FRANKLY DON'T EXPECT THEM TO TAKE ACTION, AS I HAVE WRITTEN SIMILAR RPTS ABOUT THIS ISSUE OVER MANY YRS, WITH NO RESULTS.

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.