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Air carrier X descent through occupied altitude had less than standard separation from cpr Y. System error.
| Attributes | |
| ACN | 252337 |
| Time | |
| Date | 199309 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : roa |
| State Reference | VA |
| Altitude | msl bound lower : 19000 msl bound upper : 19600 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdc |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 1 |
| ASRS Report | 252337 |
| 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 | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21000 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I went 2 sectors away to montebello and asked them to quick look my sector so I could answer the aircraft. I was at sector 60 about 10-15 seconds until my pvd was again operational. I returned to my sector with a handoff flashing to me very close to the boundary. The override lit up and it was L30 asking me to take the handoff. I took the handoff on air carrier X descending to FL200 while still refamiliarizing myself with the sector and making sure my equipment was still set up correctly. Air carrier X checked on frequency, I knew he landed gso and I descended him. I knew within 3-4 seconds that he had to stop at FL200. I reclred him to FL200 for traffic at FL190, cpr Y. At this time air carrier X data block showed him leaving FL201.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM CPR Y. SYS ERROR.
Narrative: I WENT 2 SECTORS AWAY TO MONTEBELLO AND ASKED THEM TO QUICK LOOK MY SECTOR SO I COULD ANSWER THE ACFT. I WAS AT SECTOR 60 ABOUT 10-15 SECONDS UNTIL MY PVD WAS AGAIN OPERATIONAL. I RETURNED TO MY SECTOR WITH A HDOF FLASHING TO ME VERY CLOSE TO THE BOUNDARY. THE OVERRIDE LIT UP AND IT WAS L30 ASKING ME TO TAKE THE HDOF. I TOOK THE HDOF ON ACR X DSNDING TO FL200 WHILE STILL REFAMILIARIZING MYSELF WITH THE SECTOR AND MAKING SURE MY EQUIP WAS STILL SET UP CORRECTLY. ACR X CHKED ON FREQ, I KNEW HE LANDED GSO AND I DSNDED HIM. I KNEW WITHIN 3-4 SECONDS THAT HE HAD TO STOP AT FL200. I RECLRED HIM TO FL200 FOR TFC AT FL190, CPR Y. AT THIS TIME ACR X DATA BLOCK SHOWED HIM LEAVING FL201.
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.