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Reporter contends that climbing VFR aircraft Y turned without notice into aircraft X, who was descending and being vectored around aircraft Y. Aircraft X received an RA and took evasive action to clear aircraft Y.
| Attributes | |
| ACN | 421161 |
| Time | |
| Date | 199811 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : jot |
| State Reference | IL |
| Altitude | agl bound lower : 13000 agl bound upper : 14000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 16 |
| ASRS Report | 421161 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 600 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
Aircraft X, descending to 11000 ft inbound to ord, was crossing near a VFR aircraft on squawk code XXXX, normally used by parachute jump aircraft. I gave aircraft X (nebound) 15 degrees left. Subsequently the VFR code YYYY (nebound) turned left 90 degrees or more (northwest) across the path of the descending aircraft X. Aircraft X announced RA, turned left and climbed to avoid. Aircraft Y (squawk code YYYY) declared stopping climb at 13000 ft. This is an ongoing daily problem at ZAU plano sector.
Original NASA ASRS Text
Title: RPTR CONTENDS THAT CLBING VFR ACFT Y TURNED WITHOUT NOTICE INTO ACFT X, WHO WAS DSNDING AND BEING VECTORED AROUND ACFT Y. ACFT X RECEIVED AN RA AND TOOK EVASIVE ACTION TO CLR ACFT Y.
Narrative: ACFT X, DSNDING TO 11000 FT INBOUND TO ORD, WAS XING NEAR A VFR ACFT ON SQUAWK CODE XXXX, NORMALLY USED BY PARACHUTE JUMP ACFT. I GAVE ACFT X (NEBOUND) 15 DEGS L. SUBSEQUENTLY THE VFR CODE YYYY (NEBOUND) TURNED L 90 DEGS OR MORE (NW) ACROSS THE PATH OF THE DSNDING ACFT X. ACFT X ANNOUNCED RA, TURNED L AND CLBED TO AVOID. ACFT Y (SQUAWK CODE YYYY) DECLARED STOPPING CLB AT 13000 FT. THIS IS AN ONGOING DAILY PROB AT ZAU PLANO SECTOR.
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.