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Fgt X descended from assigned altitude and had less than standard separation from air carrier Y. Pilot deviation.
| Attributes | |
| ACN | 139126 |
| Time | |
| Date | 199003 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : las |
| State Reference | NV |
| Altitude | msl bound lower : 14000 msl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla tracon : las tower : bos |
| Operator | other |
| Make Model Name | Fighter |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 1 |
| ASRS Report | 139126 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 7 |
| ASRS Report | 139115 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance other anomaly other |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : unable |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 15000 vertical : 400 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
In 3/90 T lax ARTCC over the las VOR, 2 fgt X mistook a clearance for another aircraft and descended head-on into air carrier Y that just departed las. Prior to this incident the receivers on one side failed and the backups were not usable either. This resulted in basically no communication with aircraft. Supervisor was notified prior to incident. This situation could've been avoided if equipment was updated. Frequency failure is becoming a daily thing. Supplemental information from acn 139115: 2 fgt X's descended on a head-on collision course with air carrier Y. The underlying reason for this error was lack of communications. 5 mins prior to this error the radios went bad (main and backup). It was very difficult to relay xmissions. Apparently the fgt X pilot took a clearance that was not for him.
Original NASA ASRS Text
Title: FGT X DESCENDED FROM ASSIGNED ALT AND HAD LESS THAN STANDARD SEPARATION FROM ACR Y. PLT DEVIATION.
Narrative: IN 3/90 T LAX ARTCC OVER THE LAS VOR, 2 FGT X MISTOOK A CLRNC FOR ANOTHER ACFT AND DSNDED HEAD-ON INTO ACR Y THAT JUST DEPARTED LAS. PRIOR TO THIS INCIDENT THE RECEIVERS ON ONE SIDE FAILED AND THE BACKUPS WERE NOT USABLE EITHER. THIS RESULTED IN BASICALLY NO COM WITH ACFT. SUPVR WAS NOTIFIED PRIOR TO INCIDENT. THIS SITUATION COULD'VE BEEN AVOIDED IF EQUIP WAS UPDATED. FREQ FAILURE IS BECOMING A DAILY THING. SUPPLEMENTAL INFO FROM ACN 139115: 2 FGT X'S DSNDED ON A HEAD-ON COLLISION COURSE WITH ACR Y. THE UNDERLYING REASON FOR THIS ERROR WAS LACK OF COMS. 5 MINS PRIOR TO THIS ERROR THE RADIOS WENT BAD (MAIN AND BACKUP). IT WAS VERY DIFFICULT TO RELAY XMISSIONS. APPARENTLY THE FGT X PLT TOOK A CLRNC THAT WAS NOT FOR HIM.
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.