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Reported loss of separation between an air carrier B727 climbing to FL310 and an air carrier B737 climbing to FL290.
| Attributes | |
| ACN | 389851 |
| Time | |
| Date | 199712 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : uca |
| State Reference | NY |
| Altitude | msl bound lower : 28600 msl bound upper : 28600 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zbw |
| Operator | common carrier : air carrier |
| Make Model Name | B727 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : direct enroute airway : zbw |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 11 |
| ASRS Report | 389851 |
| 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 |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 100 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 was FL280 climbing to FL310 direct to syr. Aircraft #2 was leaving FL210 and issued climb to FL290 based on observed climb rates and aircraft characteristics. Aircraft #2 was turned 15 degrees left to jhw and to provide lateral separation for continued climb to FL350 eventually. Due to radar position equipment limitations, the amended route had to be updated at the RA position. In the approximately 1 1/2 mins it took to update the flight plan and return to observing the radar scope the updated data blocks reflected that aircraft #1 was at FL285 and aircraft #2 was at FL274. In an attempt to maintain separation, aircraft #2 was issued FL280. The next screen update indicated aircraft #1 at FL286 and aircraft #2 at FL284. The subsequent update indicated aircraft #1 at FL287 and aircraft #2 at FL286. Aircraft #2 reported a TCASII alert shortly thereafter.
Original NASA ASRS Text
Title: RPTED LOSS OF SEPARATION BTWN AN ACR B727 CLBING TO FL310 AND AN ACR B737 CLBING TO FL290.
Narrative: ACFT #1 WAS FL280 CLBING TO FL310 DIRECT TO SYR. ACFT #2 WAS LEAVING FL210 AND ISSUED CLB TO FL290 BASED ON OBSERVED CLB RATES AND ACFT CHARACTERISTICS. ACFT #2 WAS TURNED 15 DEGS L TO JHW AND TO PROVIDE LATERAL SEPARATION FOR CONTINUED CLB TO FL350 EVENTUALLY. DUE TO RADAR POS EQUIP LIMITATIONS, THE AMENDED RTE HAD TO BE UPDATED AT THE RA POS. IN THE APPROX 1 1/2 MINS IT TOOK TO UPDATE THE FLT PLAN AND RETURN TO OBSERVING THE RADAR SCOPE THE UPDATED DATA BLOCKS REFLECTED THAT ACFT #1 WAS AT FL285 AND ACFT #2 WAS AT FL274. IN AN ATTEMPT TO MAINTAIN SEPARATION, ACFT #2 WAS ISSUED FL280. THE NEXT SCREEN UPDATE INDICATED ACFT #1 AT FL286 AND ACFT #2 AT FL284. THE SUBSEQUENT UPDATE INDICATED ACFT #1 AT FL287 AND ACFT #2 AT FL286. ACFT #2 RPTED A TCASII ALERT SHORTLY THEREAFTER.
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.