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Less than standard separation between 2 air carrier aircraft south of ilm in the positive control area.
| Attributes | |
| ACN | 125492 |
| Time | |
| Date | 198910 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : ilm |
| State Reference | NC |
| Altitude | msl bound lower : 35500 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other 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 | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 11000 flight time type : 900 |
| ASRS Report | 125492 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 0 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation Operational Error |
Narrative:
Schedule flight operating from miami, fl to raleigh-durham, nc. At a level cruising altitude of 37,000 aircraft was proceeding direct to wilmington (ilm) VOR. Approximately heading was 010 degree maintaining. A course of 014 degree. Aircraft was given a clearance to descend to FL310 and pilot's discretion to cross a point 35 NM southeast of ilm at FL270. In descent through FL355 aircraft was given the following 'air carrier X make an immediate turn to 060 degree, air carrier Y XXX? Make an immediate left turn to 220 degree!' then ATC advised, 'air carrier X come further right to 090 degree immediately!' an aircraft was observed at our 12 O'clock position, at approximately the same altitude. When both aircraft executed the directed turn, aircraft passed to our left at approximately 3 mi in a co-altitude condition. ATC controller when asked if we had the required separation said, 'I'm afraid not'.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION BETWEEN 2 ACR ACFT SOUTH OF ILM IN THE PCA.
Narrative: SCHEDULE FLT OPERATING FROM MIAMI, FL TO RALEIGH-DURHAM, NC. AT A LEVEL CRUISING ALT OF 37,000 ACFT WAS PROCEEDING DIRECT TO WILMINGTON (ILM) VOR. APPROX HDG WAS 010 DEG MAINTAINING. A COURSE OF 014 DEG. ACFT WAS GIVEN A CLRNC TO DSND TO FL310 AND PLT'S DISCRETION TO CROSS A POINT 35 NM SE OF ILM AT FL270. IN DSCNT THROUGH FL355 ACFT WAS GIVEN THE FOLLOWING 'ACR X MAKE AN IMMEDIATE TURN TO 060 DEG, ACR Y XXX? MAKE AN IMMEDIATE LEFT TURN TO 220 DEG!' THEN ATC ADVISED, 'ACR X COME FURTHER RIGHT TO 090 DEG IMMEDIATELY!' AN ACFT WAS OBSERVED AT OUR 12 O'CLOCK POSITION, AT APPROX THE SAME ALT. WHEN BOTH ACFT EXECUTED THE DIRECTED TURN, ACFT PASSED TO OUR LEFT AT APPROX 3 MI IN A CO-ALT CONDITION. ATC CTLR WHEN ASKED IF WE HAD THE REQUIRED SEPARATION SAID, 'I'M AFRAID NOT'.
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.