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Less than standard separation between air carrier and corp aircraft. Pilot deviation or operational error.
| Attributes | |
| ACN | 100250 |
| Time | |
| Date | 198812 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : stl |
| State Reference | MO |
| Altitude | msl bound lower : 15000 msl bound upper : 15000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach descent other |
| Route In Use | arrival star : star enroute airway : v67 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 100250 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | other other : unspecified atc |
| Resolutory Action | controller : issued new clearance none taken : insufficient time none taken : unable |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 6000 vertical : 0 |
| Supplementary | |
| Primary Problem | Ambiguous |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
Air carrier X destination stl on brush 1 STAR cleared to descend to FL160, expect oddly at 100 and 250 KTS. Pilot read back correct. Traffic was corp Y sebnd destination bna, at 150. Mode C altitude read out showed air carrier X through 160 (15.7). I asked X to verify assigned altitude. Pilot answered oddly at 100, 250 KTS. I informed X that this was incorrect that his altitude was 160. By this time X was through 147 and approximately 4-6 NM west of aircraft Y, diverging. Pilot of X asked what I wanted him to do. I informed X that the traffic Y at 150 was no longer a factor, and to cross oddly at 100 250 KTS.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION BETWEEN ACR AND CORP ACFT. PLT DEVIATION OR OPERATIONAL ERROR.
Narrative: ACR X DEST STL ON BRUSH 1 STAR CLRED TO DSND TO FL160, EXPECT ODDLY AT 100 AND 250 KTS. PLT READ BACK CORRECT. TFC WAS CORP Y SEBND DEST BNA, AT 150. MODE C ALT READ OUT SHOWED ACR X THROUGH 160 (15.7). I ASKED X TO VERIFY ASSIGNED ALT. PLT ANSWERED ODDLY AT 100, 250 KTS. I INFORMED X THAT THIS WAS INCORRECT THAT HIS ALT WAS 160. BY THIS TIME X WAS THROUGH 147 AND APPROX 4-6 NM W OF ACFT Y, DIVERGING. PLT OF X ASKED WHAT I WANTED HIM TO DO. I INFORMED X THAT THE TFC Y AT 150 WAS NO LONGER A FACTOR, AND TO CROSS ODDLY AT 100 250 KTS.
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.