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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ARTCC radar controller gave an air carrier B737 a descent to FL240 then tried to stop the aircraft at FL260 due to traffic at FL250. The B737 saw the traffic on its TCASII, but was unable to stop the descent until FL255. Less than standard separation occurred due to the late clearance from controller.
| Attributes | |
| ACN | 320850 |
| Time | |
| Date | 199511 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : hvp |
| State Reference | WV |
| Altitude | msl bound lower : 25500 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid tower : ewr |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 200 flight time total : 6000 flight time type : 1000 |
| ASRS Report | 320850 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 4500 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
We were passing 25500 ft cleared to 24000 ft. Aircraft on TCASII at 25000 ft. The controller called to ask us to level at 26000 ft. We started immediate climb to 26000 ft. Controller kept asking us if we were level at 26000 ft. Controller appeared to have missed the other traffic when giving us 24000 ft as an altitude.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR GAVE AN ACR B737 A DSCNT TO FL240 THEN TRIED TO STOP THE ACFT AT FL260 DUE TO TFC AT FL250. THE B737 SAW THE TFC ON ITS TCASII, BUT WAS UNABLE TO STOP THE DSCNT UNTIL FL255. LTSS OCCURRED DUE TO THE LATE CLRNC FROM CTLR.
Narrative: WE WERE PASSING 25500 FT CLRED TO 24000 FT. ACFT ON TCASII AT 25000 FT. THE CTLR CALLED TO ASK US TO LEVEL AT 26000 FT. WE STARTED IMMEDIATE CLB TO 26000 FT. CTLR KEPT ASKING US IF WE WERE LEVEL AT 26000 FT. CTLR APPEARED TO HAVE MISSED THE OTHER TFC WHEN GIVING US 24000 FT AS AN ALT.
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.