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Air carrier X descent through occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 314500 |
| Time | |
| Date | 199508 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : slt |
| State Reference | PA |
| Altitude | msl bound lower : 23000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob tower : lga |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| 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 : 10 |
| ASRS Report | 314500 |
| 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 non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18600 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Considerable chop occurring in higher altitudes, aircraft descending to lower altitude sectors that don't normally handle spacing these aircraft for ewr, ord, dtw. Adding aircraft approachs to 2 different airports with departure clearance from 1 airport occurring on center frequencys, 2 center frequencys, 1 split into north and south, cover this sector. Clearance was given to air carrier X at FL240 to FL200 that appeared to be past and clear of eastbound air carrier Y at FL230. No conflict alert activated, signifying any loss of separation.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: CONSIDERABLE CHOP OCCURRING IN HIGHER ALTS, ACFT DSNDING TO LOWER ALT SECTORS THAT DON'T NORMALLY HANDLE SPACING THESE ACFT FOR EWR, ORD, DTW. ADDING ACFT APCHS TO 2 DIFFERENT ARPTS WITH DEP CLRNC FROM 1 ARPT OCCURRING ON CTR FREQS, 2 CTR FREQS, 1 SPLIT INTO N AND S, COVER THIS SECTOR. CLRNC WAS GIVEN TO ACR X AT FL240 TO FL200 THAT APPEARED TO BE PAST AND CLR OF EBOUND ACR Y AT FL230. NO CONFLICT ALERT ACTIVATED, SIGNIFYING ANY LOSS OF SEPARATION.
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.