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Air carrier X making approach into len, mexico, receives a TCASII alert to descend and believes he may have had an near midair collision. Pilot learned later ATC had cleared air carrier Y for approach at same altitude closely behind his flight.
| Attributes | |
| ACN | 403336 |
| Time | |
| Date | 199805 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bjx |
| State Reference | FO |
| Altitude | msl bound lower : 14000 msl bound upper : 11000 |
| Aircraft 1 | |
| Controlling Facilities | tracon : len |
| Operator | common carrier : air carrier |
| Make Model Name | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| ASRS Report | 403336 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure non adherence : clearance |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Location: bjx VOR overhead NAVAID descending to 11000 ft from 14000 ft. Turned into the holding pattern to lose altitude and to course realign. Once at 11000 ft and heading inbound to the VOR, we received a TCASII alert followed by descend message. We descended and commenced the VOR DME 13 approach without further incident. The tower had also cleared an air carrier Y for the same approach at the same altitude right behind us.
Original NASA ASRS Text
Title: ACR X MAKING APCH INTO LEN, MEXICO, RECEIVES A TCASII ALERT TO DSND AND BELIEVES HE MAY HAVE HAD AN NMAC. PLT LEARNED LATER ATC HAD CLRED ACR Y FOR APCH AT SAME ALT CLOSELY BEHIND HIS FLT.
Narrative: LOCATION: BJX VOR OVERHEAD NAVAID DSNDING TO 11000 FT FROM 14000 FT. TURNED INTO THE HOLDING PATTERN TO LOSE ALT AND TO COURSE REALIGN. ONCE AT 11000 FT AND HDG INBOUND TO THE VOR, WE RECEIVED A TCASII ALERT FOLLOWED BY DSND MESSAGE. WE DSNDED AND COMMENCED THE VOR DME 13 APCH WITHOUT FURTHER INCIDENT. THE TWR HAD ALSO CLRED AN ACR Y FOR THE SAME APCH AT THE SAME ALT RIGHT BEHIND US.
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.