 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
ARTCC supervisor controller observes conflict at FL310 and descends one aircraft to FL280. During descent, controller recognizes conflict with aircraft at FL290 and stops descending traffic, climbing it back to FL310 and comes into conflict with beginning situation. Both aircraft react to TCASII.
| Attributes | |
| ACN | 411259 |
| Time | |
| Date | 199808 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ape |
| State Reference | OH |
| Altitude | msl bound lower : 29000 msl bound upper : 31000 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Challenger CL604 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar pilot : private |
| Experience | controller radar : 20 flight time total : 400 |
| ASRS Report | 411259 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 1600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Both aircraft head on at FL310. Aircraft #2 descended to FL280. Controller overlooked other traffic at FL290 and climbed aircraft #2 back to FL310. Controller overlooked the initial confliction of aircraft #1 and aircraft #2. Both aircraft reacted to TCASII RA's.
Original NASA ASRS Text
Title: ARTCC SUPVR CTLR OBSERVES CONFLICT AT FL310 AND DSNDS ONE ACFT TO FL280. DURING DSCNT, CTLR RECOGNIZES CONFLICT WITH ACFT AT FL290 AND STOPS DSNDING TFC, CLBING IT BACK TO FL310 AND COMES INTO CONFLICT WITH BEGINNING SIT. BOTH ACFT REACT TO TCASII.
Narrative: BOTH ACFT HEAD ON AT FL310. ACFT #2 DSNDED TO FL280. CTLR OVERLOOKED OTHER TFC AT FL290 AND CLBED ACFT #2 BACK TO FL310. CTLR OVERLOOKED THE INITIAL CONFLICTION OF ACFT #1 AND ACFT #2. BOTH ACFT REACTED TO TCASII RA'S.
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.