Narrative:

Departing mateo on runway 5R arrival, we were given 160 degree heading for traffic and 190 KIAS to be maintained, realizing the overshooting vector while the localizer was captured and centered> a 050 degree vector was given to reintercept, then, a 350 degree heading. Speed, erratic vectors, and traffic accounted for a more than unusual approach to runway 05R. Aircraft was stabilized approximately 4.0 DME. Callback conversation with reporter revealed the following information: the reporter said he was the first officer and the captain was flying. He said the autoplt did not capture the localizer so was disconnected. The reporter could not be sure whether or not the problem was a false localizer. He said the radio aids in mexico seem to be characteristically weak, like for example, difficult to get a satisfactory identify. When not using smo 160 degree radial and the 9.2 DME for lead in information the pilot might have his #2 VHF navigation on the mex VOR to pick up the 248 degree lead in radial (and the DME arc if necessary). The captain's VHF navigation is selected to the ILS (imwx). The ADF would be on plaza (mw). The copilot has about 5000 hours total time and has been into mexico 1 other time and used the other runway. The instruments are partial advanced having an EFIS and ADI and the airplane is CAT III with the third IRS as a backup for fail active navigation system.

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Original NASA ASRS Text

Title: FLC HAS DIFFICULTY ALIGNING WITH THE LOC.

Narrative: DEPARTING MATEO ON RWY 5R ARR, WE WERE GIVEN 160 DEG HDG FOR TFC AND 190 KIAS TO BE MAINTAINED, REALIZING THE OVERSHOOTING VECTOR WHILE THE LOC WAS CAPTURED AND CTRED> A 050 DEG VECTOR WAS GIVEN TO REINTERCEPT, THEN, A 350 DEG HDG. SPD, ERRATIC VECTORS, AND TFC ACCOUNTED FOR A MORE THAN UNUSUAL APCH TO RWY 05R. ACFT WAS STABILIZED APPROX 4.0 DME. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID HE WAS THE FO AND THE CAPT WAS FLYING. HE SAID THE AUTOPLT DID NOT CAPTURE THE LOC SO WAS DISCONNECTED. THE RPTR COULD NOT BE SURE WHETHER OR NOT THE PROB WAS A FALSE LOC. HE SAID THE RADIO AIDS IN MEXICO SEEM TO BE CHARACTERISTICALLY WEAK, LIKE FOR EXAMPLE, DIFFICULT TO GET A SATISFACTORY IDENT. WHEN NOT USING SMO 160 DEG RADIAL AND THE 9.2 DME FOR LEAD IN INFO THE PLT MIGHT HAVE HIS #2 VHF NAV ON THE MEX VOR TO PICK UP THE 248 DEG LEAD IN RADIAL (AND THE DME ARC IF NECESSARY). THE CAPT'S VHF NAV IS SELECTED TO THE ILS (IMWX). THE ADF WOULD BE ON PLAZA (MW). THE COPLT HAS ABOUT 5000 HRS TOTAL TIME AND HAS BEEN INTO MEXICO 1 OTHER TIME AND USED THE OTHER RWY. THE INSTS ARE PARTIAL ADVANCED HAVING AN EFIS AND ADI AND THE AIRPLANE IS CAT III WITH THE THIRD IRS AS A BACKUP FOR FAIL ACTIVE NAV SYS.

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.