Narrative:

During taxi out; first officer copied and read back clearance as direct pitox; maintain 3000 ft. After takeoff on runway 17; on first contact with las americas departure we were given clearance to 15000 ft. At approximately 1500 ft first officer began a left turn to pitox. At 2700 ft departure told us we were cleared to pitox at 3000 ft. First officer began a quick leveloff; but departure then reclred us direct to pta to maintain 15000 ft. He also informed us that tower had cleared us via the pitox departure to maintain 3000 ft. There was no further radio discussion of the situation. After reviewing the SID pages; it appears that the only departure procedures routed through pitox are from runway 35. Additionally; none of the sids are actually named 'pitox departure;' and the FMS database contains no sids by that name. Apparently ATC was expecting us to fly a different procedure from what we flew; but in our opinion we were following the clearance received (and read back). I have had numerous communication problems and difficulties with the sdq tower controllers; as they are often quite difficult to understand; and their xmissions are frequently choppy (probably due to a bad microphone connection or a short; but it seems like they just don't hold the button down long enough). I would very much like to know what the pitox departure from runway 17 consists of; and why it is not depicted either on the pages or in the FMS database.

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Original NASA ASRS Text

Title: DEPARTING MDSD; B757-200 FLT CREW RECEIVES CONFUSING CLRNC WHICH RESULTS IN DISAGREEMENTS WITH ATC REGARDING THEIR RTE OF FLT AND ALT.

Narrative: DURING TAXI OUT; FO COPIED AND READ BACK CLRNC AS DIRECT PITOX; MAINTAIN 3000 FT. AFTER TKOF ON RWY 17; ON FIRST CONTACT WITH LAS AMERICAS DEP WE WERE GIVEN CLRNC TO 15000 FT. AT APPROX 1500 FT FO BEGAN A L TURN TO PITOX. AT 2700 FT DEP TOLD US WE WERE CLRED TO PITOX AT 3000 FT. FO BEGAN A QUICK LEVELOFF; BUT DEP THEN RECLRED US DIRECT TO PTA TO MAINTAIN 15000 FT. HE ALSO INFORMED US THAT TWR HAD CLRED US VIA THE PITOX DEP TO MAINTAIN 3000 FT. THERE WAS NO FURTHER RADIO DISCUSSION OF THE SIT. AFTER REVIEWING THE SID PAGES; IT APPEARS THAT THE ONLY DEP PROCS ROUTED THROUGH PITOX ARE FROM RWY 35. ADDITIONALLY; NONE OF THE SIDS ARE ACTUALLY NAMED 'PITOX DEP;' AND THE FMS DATABASE CONTAINS NO SIDS BY THAT NAME. APPARENTLY ATC WAS EXPECTING US TO FLY A DIFFERENT PROC FROM WHAT WE FLEW; BUT IN OUR OPINION WE WERE FOLLOWING THE CLRNC RECEIVED (AND READ BACK). I HAVE HAD NUMEROUS COM PROBS AND DIFFICULTIES WITH THE SDQ TWR CTLRS; AS THEY ARE OFTEN QUITE DIFFICULT TO UNDERSTAND; AND THEIR XMISSIONS ARE FREQUENTLY CHOPPY (PROBABLY DUE TO A BAD MIKE CONNECTION OR A SHORT; BUT IT SEEMS LIKE THEY JUST DON'T HOLD THE BUTTON DOWN LONG ENOUGH). I WOULD VERY MUCH LIKE TO KNOW WHAT THE PITOX DEP FROM RWY 17 CONSISTS OF; AND WHY IT IS NOT DEPICTED EITHER ON THE PAGES OR IN THE FMS DATABASE.

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.