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Near midair collision between a gulfstream V descending back to altitude from which previously cleared by ARTCC controller, and an unknown aircraft passing over at 500 ft according to TCASII.
| Attributes | |
| ACN | 515051 |
| Time | |
| Date | 200106 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : vhp.vortac |
| State Reference | IN |
| Altitude | msl bound lower : 26000 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc artcc : zla.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Gulfstream V |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 120 flight time total : 5000 flight time type : 500 |
| ASRS Report | 515051 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : nmac non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa |
| Resolutory Action | controller : separated traffic controller : issued new clearance none taken : detected after the fact |
| Miss Distance | horizontal : 0 vertical : 500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error other |
Narrative:
ZID instructed gv to climb from FL260 to FL280. During the initial part of the climb, the controller instructed us to return to FL260. At this time the TCASII activated as an RA. We initiated the descent to FL260. Another aircraft passed over during our descent to FL260. The controller said nothing of the incident. The rest of the flight continued without incident.
Original NASA ASRS Text
Title: NMAC BTWN A GULFSTREAM V DSNDING BACK TO ALT FROM WHICH PREVIOUSLY CLRED BY ARTCC CTLR, AND AN UNKNOWN ACFT PASSING OVER AT 500 FT ACCORDING TO TCASII.
Narrative: ZID INSTRUCTED GV TO CLB FROM FL260 TO FL280. DURING THE INITIAL PART OF THE CLB, THE CTLR INSTRUCTED US TO RETURN TO FL260. AT THIS TIME THE TCASII ACTIVATED AS AN RA. WE INITIATED THE DSCNT TO FL260. ANOTHER ACFT PASSED OVER DURING OUR DSCNT TO FL260. THE CTLR SAID NOTHING OF THE INCIDENT. THE REST OF THE FLT CONTINUED WITHOUT INCIDENT.
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.