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Military X descent through occupied altitude had less than standard separation from air carrier Y. System error.
| Attributes | |
| ACN | 293627 |
| Time | |
| Date | 199501 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : eni |
| State Reference | CA |
| Altitude | msl bound lower : 33000 msl bound upper : 33000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | other |
| Make Model Name | Military |
| Operating Under FAR Part | other : other |
| Flight Phase | descent 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 |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller non radar : 3 controller radar : 1 |
| ASRS Report | 293627 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : non radar |
| Qualification | controller : radar |
| Experience | controller non radar : 5 controller radar : 2 |
| ASRS Report | 293689 |
| Events | |
| Anomaly | non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 18600 vertical : 1300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was trying to descend military X while holding at eni so he could land at travis. Sbound air carrier Y at FL330, northbound air carrier at FL350, military was at FL350. I descended military X to FL310 and turned him 40 degrees right. I then sent military X to FL290 and turned air carrier Y 30 degrees right. I gave military X immediate and expedite a couple of times, did not descend as fast as I thought and Y didn't turn as fast as I thought it would. Supplemental information from acn 293689: military aircraft was holding at eni descending for suu. Call sign military Y his holding pattern appeared 'wide' to the east. Air carrier Y was sbound at FL330. X issued clearance to FL290, expedite from the radar controller. Turns were issued to both aircraft. However, none of these actions were sufficient to prevent a loss of separation.
Original NASA ASRS Text
Title: MIL X DSCNT THROUGH OCCUPIED ALT HAD LTSS FROM ACR Y. SYS ERROR.
Narrative: I WAS TRYING TO DSND MIL X WHILE HOLDING AT ENI SO HE COULD LAND AT TRAVIS. SBOUND ACR Y AT FL330, NBOUND ACR AT FL350, MIL WAS AT FL350. I DSNDED MIL X TO FL310 AND TURNED HIM 40 DEGS R. I THEN SENT MIL X TO FL290 AND TURNED ACR Y 30 DEGS R. I GAVE MIL X IMMEDIATE AND EXPEDITE A COUPLE OF TIMES, DID NOT DSND AS FAST AS I THOUGHT AND Y DIDN'T TURN AS FAST AS I THOUGHT IT WOULD. SUPPLEMENTAL INFO FROM ACN 293689: MIL ACFT WAS HOLDING AT ENI DSNDING FOR SUU. CALL SIGN MIL Y HIS HOLDING PATTERN APPEARED 'WIDE' TO THE E. ACR Y WAS SBOUND AT FL330. X ISSUED CLRNC TO FL290, EXPEDITE FROM THE RADAR CTLR. TURNS WERE ISSUED TO BOTH ACFT. HOWEVER, NONE OF THESE ACTIONS WERE SUFFICIENT TO PREVENT A 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.