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A300 descending on UG437 into segy; had to stop descent to avoid near midair collision with opposite direction traffic.
| Attributes | |
| ACN | 704227 |
| Time | |
| Date | 200607 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : segu.airport |
| State Reference | FO |
| Altitude | msl single value : 33000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : segu.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : segu.artcc |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise : level |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 704227 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne critical non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Supplementary | |
| Problem Areas | Airspace Structure ATC Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
En route to gye on UG437 we received a clearance from gye to leave FL330 to FL240 at XA47Z. Copilot dialed in FL240 and I confirmed FL240. We were 2 mins north of orola intersection sbound. I glanced at TCAS with no aircraft within 40 NM. We were in the clear; high and needed to get down fast. I just left FL330 and began to nose aircraft over for a high rate of descent. Out of nowhere; directly in front of us; at FL320 northbound; on UG437 another aircraft's light came on. Had I not looked out and caught sight of his lights there would have been a midair collision. The other aircraft never showed up on TCAS. We complained to gye ATC; only to be reconfirmed to descend to FL240. I asked to speak to a gye supervisor and explained the seriousness of the situation only to be reclred a third time to FL240. I never got to speak to a supervisor.
Original NASA ASRS Text
Title: A300 DSNDING ON UG437 INTO SEGY; HAD TO STOP DSCNT TO AVOID NMAC WITH OPPOSITE DIRECTION TFC.
Narrative: ENRTE TO GYE ON UG437 WE RECEIVED A CLRNC FROM GYE TO LEAVE FL330 TO FL240 AT XA47Z. COPLT DIALED IN FL240 AND I CONFIRMED FL240. WE WERE 2 MINS N OF OROLA INTXN SBOUND. I GLANCED AT TCAS WITH NO ACFT WITHIN 40 NM. WE WERE IN THE CLR; HIGH AND NEEDED TO GET DOWN FAST. I JUST LEFT FL330 AND BEGAN TO NOSE ACFT OVER FOR A HIGH RATE OF DSCNT. OUT OF NOWHERE; DIRECTLY IN FRONT OF US; AT FL320 NBOUND; ON UG437 ANOTHER ACFT'S LIGHT CAME ON. HAD I NOT LOOKED OUT AND CAUGHT SIGHT OF HIS LIGHTS THERE WOULD HAVE BEEN A MIDAIR COLLISION. THE OTHER ACFT NEVER SHOWED UP ON TCAS. WE COMPLAINED TO GYE ATC; ONLY TO BE RECONFIRMED TO DSND TO FL240. I ASKED TO SPEAK TO A GYE SUPVR AND EXPLAINED THE SERIOUSNESS OF THE SITUATION ONLY TO BE RECLRED A THIRD TIME TO FL240. I NEVER GOT TO SPEAK TO A SUPVR.
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.