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Potential conflict and loss of separation occurs as clearance for descent is through an occupied altitude.
| Attributes | |
| ACN | 136852 |
| Time | |
| Date | 199002 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : bsr |
| State Reference | CA |
| Altitude | msl bound lower : 25600 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa tower : mia |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 16000 flight time type : 1100 |
| ASRS Report | 136852 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : returned to intended course or assigned course other |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 600 |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Operational Error Pilot Deviation other |
Narrative:
We were approaching bsr VORTAC at FL260 when oakland center cleared us to descend to FL240. During our descent, at approximately FL256, center advised us of conflicting traffic at FL250 and they cleared to climb back to FL260.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT AND LOSS OF SEPARATION OCCURS AS CLRNC FOR DESCENT IS THROUGH AN OCCUPIED ALT.
Narrative: WE WERE APCHING BSR VORTAC AT FL260 WHEN OAKLAND CENTER CLRED US TO DSND TO FL240. DURING OUR DSCNT, AT APPROX FL256, CENTER ADVISED US OF CONFLICTING TFC AT FL250 AND THEY CLRED TO CLB BACK TO FL260.
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.