Narrative:

I have flown through las 4 times in 2 days and have seen all the memos regarding the las SID's. I have noticed a lack of standardized clrncs given by las ATC which could contribute to the altdevs. In the last 2 days, I have received the following clrncs by the departure controller prior to reaching the 7000 ft crossing fix: climb to FL190 with restrs, climb to FL190 without restrs, after passing XXX climb to FL190, and on our last flight, climb to FL190. There seems to be no consistency in what you can expect from ATC. I firmly believe this is contributing to the problem. There are many things we are dealing with during this time, such as verifying the aircraft is staying on the SID, TCASII traffic from arrs overhead, and the fact that the arrival and departure procedures seem to change here every yr. Maybe if ATC could change their procedures to wait until after the aircraft passed the crossing fix before giving an altitude clearance or limit the number of ways they phrase the clearance it might help the situation. I do not know what the perfect solution is and I realize we are ultimately responsible, but I also believe ATC is contributing to what can be a confusing environment.

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Original NASA ASRS Text

Title: B737-300 CAPT QUESTIONS NUMEROUS LAS ARR AND DEP SID CHANGES WITH L30'S APPARENT INCONSISTENCIES OF PHRASEOLOGY USAGE IN APPLYING THE NEW PROCS.

Narrative: I HAVE FLOWN THROUGH LAS 4 TIMES IN 2 DAYS AND HAVE SEEN ALL THE MEMOS REGARDING THE LAS SID'S. I HAVE NOTICED A LACK OF STANDARDIZED CLRNCS GIVEN BY LAS ATC WHICH COULD CONTRIBUTE TO THE ALTDEVS. IN THE LAST 2 DAYS, I HAVE RECEIVED THE FOLLOWING CLRNCS BY THE DEP CTLR PRIOR TO REACHING THE 7000 FT XING FIX: CLB TO FL190 WITH RESTRS, CLB TO FL190 WITHOUT RESTRS, AFTER PASSING XXX CLB TO FL190, AND ON OUR LAST FLT, CLB TO FL190. THERE SEEMS TO BE NO CONSISTENCY IN WHAT YOU CAN EXPECT FROM ATC. I FIRMLY BELIEVE THIS IS CONTRIBUTING TO THE PROB. THERE ARE MANY THINGS WE ARE DEALING WITH DURING THIS TIME, SUCH AS VERIFYING THE ACFT IS STAYING ON THE SID, TCASII TFC FROM ARRS OVERHEAD, AND THE FACT THAT THE ARR AND DEP PROCS SEEM TO CHANGE HERE EVERY YR. MAYBE IF ATC COULD CHANGE THEIR PROCS TO WAIT UNTIL AFTER THE ACFT PASSED THE XING FIX BEFORE GIVING AN ALT CLRNC OR LIMIT THE NUMBER OF WAYS THEY PHRASE THE CLRNC IT MIGHT HELP THE SIT. I DO NOT KNOW WHAT THE PERFECT SOLUTION IS AND I REALIZE WE ARE ULTIMATELY RESPONSIBLE, BUT I ALSO BELIEVE ATC IS CONTRIBUTING TO WHAT CAN BE A CONFUSING ENVIRONMENT.

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.