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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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2 aircraft approaching head-on. 1 aircraft was descended without any restrictions and this resulted in less than standard separation with the other aircraft.
| Attributes | |
| ACN | 146492 |
| Time | |
| Date | 199005 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sle |
| State Reference | OR |
| Altitude | msl bound lower : 14200 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Route In Use | enroute airway : v23 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 2 |
| ASRS Report | 146492 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| Experience | controller military : 3 controller non radar : 1 controller radar : 1 |
| ASRS Report | 146493 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 200 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I had been on sector with a student for 2 hours and 5 mins of moderate to heavy traffic and had just been offered a break. A light transport was south on V23 14000' descending to 10000'. An small transport was nebnd descending direct wylee. Student recognized traffic situation and cleared the small transport to 15000'. I backed away from console to allow relieving controller access and was documenting a previous error when student cleared small transport to 12000'. I did not hear the clearance issued. I recognized situation when the aircraft were head-on with 3-4 mi between them and 600' vertical sep. I issued immediate descent clearance to light transport at which time pilot reported traffic in sight. C/a did not activate until well after sep had been lost. I would have liked a break sooner, but no one was available. I believe fatigue had set in and more staffing is necessary to allow less time on position.
Original NASA ASRS Text
Title: 2 ACFT APCHING HEAD-ON. 1 ACFT WAS DESCENDED WITHOUT ANY RESTRICTIONS AND THIS RESULTED IN LESS THAN STANDARD SEPARATION WITH THE OTHER ACFT.
Narrative: I HAD BEEN ON SECTOR WITH A STUDENT FOR 2 HRS AND 5 MINS OF MODERATE TO HEAVY TFC AND HAD JUST BEEN OFFERED A BREAK. A LTT WAS S ON V23 14000' DSNDING TO 10000'. AN SMT WAS NEBND DSNDING DIRECT WYLEE. STUDENT RECOGNIZED TFC SITUATION AND CLRED THE SMT TO 15000'. I BACKED AWAY FROM CONSOLE TO ALLOW RELIEVING CTLR ACCESS AND WAS DOCUMENTING A PREVIOUS ERROR WHEN STUDENT CLRED SMT TO 12000'. I DID NOT HEAR THE CLRNC ISSUED. I RECOGNIZED SITUATION WHEN THE ACFT WERE HEAD-ON WITH 3-4 MI BTWN THEM AND 600' VERT SEP. I ISSUED IMMEDIATE DSNT CLRNC TO LTT AT WHICH TIME PLT RPTED TFC IN SIGHT. C/A DID NOT ACTIVATE UNTIL WELL AFTER SEP HAD BEEN LOST. I WOULD HAVE LIKED A BREAK SOONER, BUT NO ONE WAS AVAILABLE. I BELIEVE FATIGUE HAD SET IN AND MORE STAFFING IS NECESSARY TO ALLOW LESS TIME ON POS.
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.