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ARTCC controller handling a DC9 in cruise at FL330 and a B737 climbing to FL350. The B737 near the top of climb slowed his climb rate and separation was lost between the 2 aircraft.
| Attributes | |
| ACN | 420758 |
| Time | |
| Date | 199811 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fkn |
| State Reference | VA |
| Altitude | msl bound lower : 33000 msl bound upper : 34100 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : pit |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller military : 5 controller non radar : 2 controller radar : 10 |
| ASRS Report | 420758 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : unable other |
| Consequence | Other |
| Miss Distance | horizontal : 9000 vertical : 1100 |
| Supplementary | |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier X climbing to FL350 at 1300 FPM. Air carrier Y level FL330. As distance (head-on) decreased below 12 mi, air carrier X climb rate fell below 1000 FPM. Time, speed, distance failed me. I did not assign a climb rate to air carrier X. I believe the aircraft was preparing to level at FL350. Prevention, assign climb rates, issue crossing restrs, and turn the aircraft 'harder.'
Original NASA ASRS Text
Title: ARTCC CTLR HANDLING A DC9 IN CRUISE AT FL330 AND A B737 CLBING TO FL350. THE B737 NEAR THE TOP OF CLB SLOWED HIS CLB RATE AND SEPARATION WAS LOST BTWN THE 2 ACFT.
Narrative: ACR X CLBING TO FL350 AT 1300 FPM. ACR Y LEVEL FL330. AS DISTANCE (HEAD-ON) DECREASED BELOW 12 MI, ACR X CLB RATE FELL BELOW 1000 FPM. TIME, SPD, DISTANCE FAILED ME. I DID NOT ASSIGN A CLB RATE TO ACR X. I BELIEVE THE ACFT WAS PREPARING TO LEVEL AT FL350. PREVENTION, ASSIGN CLB RATES, ISSUE XING RESTRS, AND TURN THE ACFT 'HARDER.'
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.