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An ARTCC radar controller report on loss of separation between 2 opposite direction aircraft with clrncs to climb and descend through each other's altitude on an expedited basis, 20 mi west of tvt, oh.
| Attributes | |
| ACN | 487000 |
| Time | |
| Date | 200010 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : tvt.vortac |
| State Reference | OH |
| Altitude | msl bound lower : 28000 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 8 controller radar : 13 controller time certified in position1 : 10 |
| ASRS Report | 487000 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : required legal separation non adherence : published procedure other anomaly other |
| Independent Detector | atc equipment : conflict alert aircraft equipment : tcas other controllera |
| Resolutory Action | controller : issued new clearance none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 19800 vertical : 0 |
| Supplementary | |
| Problem Areas | Airspace Structure Flight Crew Human Performance ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
B757-200 at FL280 descending to FL270 with DC9Q head-on, level at FL280. B757-200 cleared to FL240 and told to expedite descent. DC9Q cleared to FL290 and told to expedite climb. B757-200 advised of an RA to climb. DC9Q advised of an RA. After looking at radar data, it appears both aircraft received an RA to climb. This led to much reduced separation than if they would've followed the controller's instructions.
Original NASA ASRS Text
Title: AN ARTCC RADAR CTLR RPT ON LOSS OF SEPARATION BTWN 2 OPPOSITE DIRECTION ACFT WITH CLRNCS TO CLB AND DSND THROUGH EACH OTHER'S ALT ON AN EXPEDITED BASIS, 20 MI W OF TVT, OH.
Narrative: B757-200 AT FL280 DSNDING TO FL270 WITH DC9Q HEAD-ON, LEVEL AT FL280. B757-200 CLRED TO FL240 AND TOLD TO EXPEDITE DSCNT. DC9Q CLRED TO FL290 AND TOLD TO EXPEDITE CLB. B757-200 ADVISED OF AN RA TO CLB. DC9Q ADVISED OF AN RA. AFTER LOOKING AT RADAR DATA, IT APPEARS BOTH ACFT RECEIVED AN RA TO CLB. THIS LED TO MUCH REDUCED SEPARATION THAN IF THEY WOULD'VE FOLLOWED THE CTLR'S INSTRUCTIONS.
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.