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Action by controller to separate 2 aircraft at same altitude on converging courses was not in sufficient time to prevent loss of separation.
| Attributes | |
| ACN | 106376 |
| Time | |
| Date | 198902 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : lrp |
| State Reference | PA |
| Altitude | msl bound lower : 8000 msl bound upper : 9000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 1 |
| ASRS Report | 106376 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| 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 | controller : issued new clearance other |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 12000 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Approximately 60 mins after assuming the radar position at sector (26 lrp) I observed 2 aircraft, both level at 9000', on converging courses. 1 was northbound, the other eastbound. In an effort to maintain sep, the eastbound aircraft was turned to a northerly heading and the northbound aircraft, following coordination with an adjacent facility, was descended to 8000'. However, minimum sep was lost shortly thereafter. Although controllers are trained not to rely on the ca feature, it should be pointed out that the ca indicator did not activate until well after sep had been lost.
Original NASA ASRS Text
Title: ACTION BY CTLR TO SEPARATE 2 ACFT AT SAME ALT ON CONVERGING COURSES WAS NOT IN SUFFICIENT TIME TO PREVENT LOSS OF SEPARATION.
Narrative: APPROX 60 MINS AFTER ASSUMING THE RADAR POS AT SECTOR (26 LRP) I OBSERVED 2 ACFT, BOTH LEVEL AT 9000', ON CONVERGING COURSES. 1 WAS NBND, THE OTHER EBND. IN AN EFFORT TO MAINTAIN SEP, THE EBND ACFT WAS TURNED TO A NORTHERLY HDG AND THE NBOUND ACFT, FOLLOWING COORD WITH AN ADJACENT FAC, WAS DSNDED TO 8000'. HOWEVER, MINIMUM SEP WAS LOST SHORTLY THEREAFTER. ALTHOUGH CTLRS ARE TRAINED NOT TO RELY ON THE CA FEATURE, IT SHOULD BE POINTED OUT THAT THE CA INDICATOR DID NOT ACTIVATE UNTIL WELL AFTER SEP HAD BEEN LOST.
Data retrieved from NASA's ASRS site as of August 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.