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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Air carrier was given descent through altitude occupied by another aircraft. Less than standard separation resulted.
| Attributes | |
| ACN | 120784 |
| Time | |
| Date | 198908 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : rzs |
| State Reference | CA |
| Altitude | msl bound lower : 7600 msl bound upper : 8000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla tower : san |
| Operator | common carrier : air carrier |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 20 |
| ASRS Report | 120784 |
| 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 | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | Other |
| Miss Distance | horizontal : 27900 vertical : 400 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Other aircraft was an small aircraft, en route at 8000' followed by an air carrier, above but landing, so had to get below. I issued a descent clearance to the air carrier thinking it would be below 7000' prior to catching up (within 5 mi) with the small aircraft. It didn't work. I issued a vector to effect separation laterally but it was too little too late.
Original NASA ASRS Text
Title: ACR WAS GIVEN DESCENT THROUGH ALT OCCUPIED BY ANOTHER ACFT. LESS THAN STANDARD SEPARATION RESULTED.
Narrative: OTHER ACFT WAS AN SMA, ENRTE AT 8000' FOLLOWED BY AN ACR, ABOVE BUT LNDG, SO HAD TO GET BELOW. I ISSUED A DSCNT CLRNC TO THE ACR THINKING IT WOULD BE BELOW 7000' PRIOR TO CATCHING UP (WITHIN 5 MI) WITH THE SMA. IT DIDN'T WORK. I ISSUED A VECTOR TO EFFECT SEPARATION LATERALLY BUT IT WAS TOO LITTLE TOO LATE.
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.