 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Air carrier X descent through occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 283092 |
| Time | |
| Date | 199409 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : phl |
| State Reference | PA |
| Altitude | msl bound lower : 4500 msl bound upper : 4500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : phl tower : buf |
| 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 : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| 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 : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 5 |
| ASRS Report | 283092 |
| 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 : 9600 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working final vector at phl. I turned air carrier X turbojet northbound with descent to 3000 ft from 6000 ft. Shortly thereafter, I turned another air carrier Y turbojet sbound with descent to 5000 ft. Having thought I issued a turn to the northbound X to intercept the localizer and with different descent clrncs I believed separation was insured. The intercept heading was not issued, however, realizing my mistake, I turned the sbound Y immediately to a 150 degree heading, and issued the northbound X a 250 degree heading in an attempt to remedy the situation. Traffic was issued at 4 mi to both aircraft.
Original NASA ASRS Text
Title: ACR X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: I WAS WORKING FINAL VECTOR AT PHL. I TURNED ACR X TURBOJET NBOUND WITH DSCNT TO 3000 FT FROM 6000 FT. SHORTLY THEREAFTER, I TURNED ANOTHER ACR Y TURBOJET SBOUND WITH DSCNT TO 5000 FT. HAVING THOUGHT I ISSUED A TURN TO THE NBOUND X TO INTERCEPT THE LOC AND WITH DIFFERENT DSCNT CLRNCS I BELIEVED SEPARATION WAS INSURED. THE INTERCEPT HDG WAS NOT ISSUED, HOWEVER, REALIZING MY MISTAKE, I TURNED THE SBOUND Y IMMEDIATELY TO A 150 DEG HDG, AND ISSUED THE NBOUND X A 250 DEG HDG IN AN ATTEMPT TO REMEDY THE SIT. TFC WAS ISSUED AT 4 MI TO BOTH ACFT.
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.