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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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Operational error less than standard separation between air carrier X and air carrier Y on converging courses at 4000 ft.
| Attributes | |
| ACN | 365719 |
| Time | |
| Date | 199704 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ord |
| State Reference | IL |
| Altitude | msl bound lower : 3000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : ord |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | cruise other other |
| Route In Use | arrival other enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent : approach descent other |
| Route In Use | approach : straight in arrival other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller radar : 12 |
| ASRS Report | 365719 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 16800 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #2 was cleared for runway 27R ILS, simultaneous ILS, and on approximately 20 mi final. Aircraft #1 was detected to be still sebound, rather than eastbound on downwind runway 27R, approximately 4 mi northwest of aircraft #2. I instructed aircraft #1 to turn left heading 030 degrees and issued traffic. I then instructed aircraft #2 to descend immediately to 3000 ft. Aircraft #1 then responded he had traffic and instructed him to maintain visual separation.
Original NASA ASRS Text
Title: OPERROR LTSS BTWN ACR X AND ACR Y ON CONVERGING COURSES AT 4000 FT.
Narrative: ACFT #2 WAS CLRED FOR RWY 27R ILS, SIMULTANEOUS ILS, AND ON APPROX 20 MI FINAL. ACFT #1 WAS DETECTED TO BE STILL SEBOUND, RATHER THAN EBOUND ON DOWNWIND RWY 27R, APPROX 4 MI NW OF ACFT #2. I INSTRUCTED ACFT #1 TO TURN L HDG 030 DEGS AND ISSUED TFC. I THEN INSTRUCTED ACFT #2 TO DSND IMMEDIATELY TO 3000 FT. ACFT #1 THEN RESPONDED HE HAD TFC AND INSTRUCTED HIM TO MAINTAIN VISUAL 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.