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A320 crew receives two runway changes during arrival to MMMX. During vectors for runway 5R an altitude assignment from ATC appears visually low to the crew. After receiving a modification to the altitude a GPWS terrain warning is activated.
| Attributes | |
| ACN | 739145 |
| Time | |
| Date | 200705 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : mmmx.airport |
| State Reference | FO |
| Altitude | msl single value : 11000 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | descent : intermediate altitude |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 170 flight time total : 8000 flight time type : 170 |
| ASRS Report | 739145 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 240 flight time total : 11000 flight time type : 800 |
| ASRS Report | 739436 |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | aircraft equipment : gpws other flight crewa |
| Resolutory Action | controller : issued new clearance |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
During arrival to MMMX; ATC notified us of a runway change to runway 23 and to expect the kobec 1B arrival. Shortly thereafter; clearance to otu was given. Just prior to reaching otu; they changed the runway back to runway 5 and vectors were given toward smo along with a descent. We visually determined the vectors would take us too close to terrain. A modified clearance was obtained that was visually safe. During maneuvering a terrain caution was activated. We were in visual contact with the ground and we were then vectored to join final for runway 5R. A normal visual approach and landing was made.
Original NASA ASRS Text
Title: A320 CREW RECEIVES TWO RWY CHANGES DURING ARR TO MMMX. DURING VECTORS FOR RWY 5R AN ALT ASSIGNMENT FROM ATC APPEARS VISUALLY LOW TO THE CREW. AFTER RECEIVING A MODIFICATION TO THE ALT A GPWS TERRAIN WARNING IS ACTIVATED.
Narrative: DURING ARR TO MMMX; ATC NOTIFIED US OF A RWY CHANGE TO RWY 23 AND TO EXPECT THE KOBEC 1B ARR. SHORTLY THEREAFTER; CLRNC TO OTU WAS GIVEN. JUST PRIOR TO REACHING OTU; THEY CHANGED THE RWY BACK TO RWY 5 AND VECTORS WERE GIVEN TOWARD SMO ALONG WITH A DSCNT. WE VISUALLY DETERMINED THE VECTORS WOULD TAKE US TOO CLOSE TO TERRAIN. A MODIFIED CLRNC WAS OBTAINED THAT WAS VISUALLY SAFE. DURING MANEUVERING A TERRAIN CAUTION WAS ACTIVATED. WE WERE IN VISUAL CONTACT WITH THE GND AND WE WERE THEN VECTORED TO JOIN FINAL FOR RWY 5R. A NORMAL VISUAL APCH AND LNDG WAS MADE.
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.