 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
ZAU controller conducting OJT; experienced operational error between FL180 and FL200; when flight crew was slow to comply with descent clearance.
| Attributes | |
| ACN | 802074 |
| Time | |
| Date | 200808 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zau.artcc |
| State Reference | IL |
| Altitude | msl bound lower : 18000 msl bound upper : 20000 |
| Environment | |
| Weather Elements | Thunderstorm |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Route In Use | arrival : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 11 controller time certified in position1 : 5 |
| ASRS Report | 802074 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 21840 vertical : 6 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Running a 10 mi in trail; 250 KTS problem for ord. I was training a developmental and discussing when and how to maintain spacing with speeds. The trainee started to issue speeds; then started to vector at the end of the problem. About 2-3 mins after the controller started vectoring at the end of the problem; then C90 slowed us to 210 KTS and 10 mi in trail so the controller started to daisy chain the ord inbounds when they 'lost the picture.' I then stepped in and tried to straighten out the problem. The E145 was given a descent clearance to FL190. The E145 was given a descent clearance to FL190 from FL220 approximately 15-20 mi before the loss of separation. When I turned the B737 to the south and the E145 north; the E145 was just leaving FL198 (approximately descent rate was 600 FPM). I then asked E145 to increase vertical rate and descended him to FL180.
Original NASA ASRS Text
Title: ZAU CTLR CONDUCTING OJT; EXPERIENCED OPERROR BETWEEN FL180 AND FL200; WHEN FLT CREW WAS SLOW TO COMPLY WITH DESCENT CLRNC.
Narrative: RUNNING A 10 MI IN TRAIL; 250 KTS PROB FOR ORD. I WAS TRAINING A DEVELOPMENTAL AND DISCUSSING WHEN AND HOW TO MAINTAIN SPACING WITH SPDS. THE TRAINEE STARTED TO ISSUE SPDS; THEN STARTED TO VECTOR AT THE END OF THE PROB. ABOUT 2-3 MINS AFTER THE CTLR STARTED VECTORING AT THE END OF THE PROB; THEN C90 SLOWED US TO 210 KTS AND 10 MI IN TRAIL SO THE CTLR STARTED TO DAISY CHAIN THE ORD INBOUNDS WHEN THEY 'LOST THE PICTURE.' I THEN STEPPED IN AND TRIED TO STRAIGHTEN OUT THE PROB. THE E145 WAS GIVEN A DSCNT CLRNC TO FL190. THE E145 WAS GIVEN A DSCNT CLRNC TO FL190 FROM FL220 APPROX 15-20 MI BEFORE THE LOSS OF SEPARATION. WHEN I TURNED THE B737 TO THE S AND THE E145 N; THE E145 WAS JUST LEAVING FL198 (APPROX DSCNT RATE WAS 600 FPM). I THEN ASKED E145 TO INCREASE VERT RATE AND DSNDED HIM TO FL180.
Data retrieved from NASA's ASRS site as of May 2009 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.