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Less than standard separation between 2 air carrier aircraft when both overshot turns to parallel ILS localizers. Operational error.
| Attributes | |
| ACN | 82179 |
| Time | |
| Date | 198802 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dtw |
| State Reference | MI |
| Altitude | msl bound lower : 4000 msl bound upper : 5000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dtw |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 25000 flight time type : 2800 |
| ASRS Report | 82179 |
| Person 2 | |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 800 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Approach clearance was: maintain 5000' MSL until dales intersection, 180 KTS until rev up, cleared ILS 3L at dtw. We overshot the localizer due to a late vectoring turn. We recaptured the runway 3L localizer 1 NM inside of the dales intersection and started a descent from 5000' MSL. At that time I saw another large transport directly below us and I estimated his altitude at 4000' MSL. He had overshot the runway 3R localizer and was lined up exactly on runway 3L. We stopped our descent immediately and were revectored for another approach. I'm glad I saw him and prefer not to think of the possibilities if we had been in the clouds.
Original NASA ASRS Text
Title: LESS THAN STANDARD SEPARATION BETWEEN 2 ACR ACFT WHEN BOTH OVERSHOT TURNS TO PARALLEL ILS LOCALIZERS. OPERATIONAL ERROR.
Narrative: APCH CLRNC WAS: MAINTAIN 5000' MSL UNTIL DALES INTXN, 180 KTS UNTIL REV UP, CLRED ILS 3L AT DTW. WE OVERSHOT THE LOC DUE TO A LATE VECTORING TURN. WE RECAPTURED THE RWY 3L LOC 1 NM INSIDE OF THE DALES INTXN AND STARTED A DSCNT FROM 5000' MSL. AT THAT TIME I SAW ANOTHER LGT DIRECTLY BELOW US AND I ESTIMATED HIS ALT AT 4000' MSL. HE HAD OVERSHOT THE RWY 3R LOC AND WAS LINED UP EXACTLY ON RWY 3L. WE STOPPED OUR DSCNT IMMEDIATELY AND WERE REVECTORED FOR ANOTHER APCH. I'M GLAD I SAW HIM AND PREFER NOT TO THINK OF THE POSSIBILITIES IF WE HAD BEEN IN THE CLOUDS.
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.