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C90 controller described near loss of separation when ZAU slowed leading departure aircraft without coordination in shared airspace.
| Attributes | |
| ACN | 714165 |
| Time | |
| Date | 200610 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : ord.airport |
| State Reference | IL |
| Altitude | msl bound lower : 10000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau.artcc tracon : c90.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | Regional Jet 700 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude climbout : initial |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zau.artcc tracon : c90.tracon |
| Operator | general aviation : personal |
| Make Model Name | Citation III VI VII |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : initial climbout : intermediate altitude |
| Route In Use | departure : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : approach |
| Qualification | controller : radar |
| Experience | controller non radar : 6 controller radar : 20 controller supervisory : 5 |
| ASRS Report | 714165 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Events | |
| Anomaly | other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | FAA |
| Primary Problem | FAA |
| Air Traffic Incident | Inter Facility Coordination Failure |
| Situations | |
| ATC Facility | procedure or policy : c90.tracon procedure or policy : zau.artcc |
Narrative:
C90 shares airspace for sbound departures. Sector 2 was following my aircraft with a C650 routed over eon (fix). Both were in trail; climbing to 13000 ft. I was then following the C650 with a CRJ7. Once we got the required space (7 mi); we tell both aircraft to build speed above 250 KTS. After sector #2 shipped the accelerating C650 to ZAU; I instructed the CRJ7 to increase speed and contact ZAU. Without advising me first; ZAU slowed the C650 to 250 KTS and let him level at 13000 ft. This created a conflict with the quickly accelerating CRJ7. A separate corridor needs to be developed for sbound out of south satellite airspace. The shared airspace we have now is extremely unsafe. ZAU needs to coordination unexpected instructions to the ord departure controller. Telling a jet to slow to 250 KTS with another jet 7 mi behind and accelerating is completely unsafe.
Original NASA ASRS Text
Title: C90 CTLR DESCRIBED NEAR LOSS OF SEPARATION WHEN ZAU SLOWED LEADING DEP ACFT WITHOUT COORD IN SHARED AIRSPACE.
Narrative: C90 SHARES AIRSPACE FOR SBOUND DEPS. SECTOR 2 WAS FOLLOWING MY ACFT WITH A C650 ROUTED OVER EON (FIX). BOTH WERE IN TRAIL; CLBING TO 13000 FT. I WAS THEN FOLLOWING THE C650 WITH A CRJ7. ONCE WE GOT THE REQUIRED SPACE (7 MI); WE TELL BOTH ACFT TO BUILD SPD ABOVE 250 KTS. AFTER SECTOR #2 SHIPPED THE ACCELERATING C650 TO ZAU; I INSTRUCTED THE CRJ7 TO INCREASE SPD AND CONTACT ZAU. WITHOUT ADVISING ME FIRST; ZAU SLOWED THE C650 TO 250 KTS AND LET HIM LEVEL AT 13000 FT. THIS CREATED A CONFLICT WITH THE QUICKLY ACCELERATING CRJ7. A SEPARATE CORRIDOR NEEDS TO BE DEVELOPED FOR SBOUND OUT OF S SATELLITE AIRSPACE. THE SHARED AIRSPACE WE HAVE NOW IS EXTREMELY UNSAFE. ZAU NEEDS TO COORD UNEXPECTED INSTRUCTIONS TO THE ORD DEP CTLR. TELLING A JET TO SLOW TO 250 KTS WITH ANOTHER JET 7 MI BEHIND AND ACCELERATING IS COMPLETELY UNSAFE.
Data retrieved from NASA's ASRS site as of January 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.