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Unknown aircraft descended down through air carrier aircraft occupied altitude during high altitude cruise causing less than standard separation.
| Attributes | |
| ACN | 205205 |
| Time | |
| Date | 199203 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : crp |
| State Reference | TX |
| Altitude | msl bound lower : 20000 msl bound upper : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zhu |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct enroute airway : zhu |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | other other : other pilot : commercial pilot : atp |
| Experience | controller military : 13 controller non radar : 3 controller radar : 21 controller supervisory : 3 flight time last 90 days : 250 flight time total : 17000 flight time type : 13000 |
| ASRS Report | 205205 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 8700 flight time type : 5100 |
| ASRS Report | 205201 |
| Events | |
| Anomaly | non adherence : required legal separation non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | horizontal : 16500 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Another airplane descended through our altitude, head on. Had other aircraft on TCASII as it went through our altitude, opposite direction, and incurred into our airspace, missing us (on our right) by 2 3/4 mi (on TCASII). Had other aircraft in sight at all times. Not sure why this occurred, but ATC controller seemed surprised by the turn of events. Supplemental information from acn 205201: center asked that we make a turn opposite of traffic, which we did at once.
Original NASA ASRS Text
Title: UNKNOWN ACFT DSNDED DOWN THROUGH ACR ACFT OCCUPIED ALT DURING HIGH ALT CRUISE CAUSING LTSS.
Narrative: ANOTHER AIRPLANE DSNDED THROUGH OUR ALT, HEAD ON. HAD OTHER ACFT ON TCASII AS IT WENT THROUGH OUR ALT, OPPOSITE DIRECTION, AND INCURRED INTO OUR AIRSPACE, MISSING US (ON OUR R) BY 2 3/4 MI (ON TCASII). HAD OTHER ACFT IN SIGHT AT ALL TIMES. NOT SURE WHY THIS OCCURRED, BUT ATC CTLR SEEMED SURPRISED BY THE TURN OF EVENTS. SUPPLEMENTAL INFO FROM ACN 205201: CTR ASKED THAT WE MAKE A TURN OPPOSITE OF TFC, WHICH WE DID AT ONCE.
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.