|37000 Feet||Browse and search NASA's
Aviation Safety Reporting System
|Local Time Of Day||1201 To 1800|
|Locale Reference||atc facility : ord|
|Altitude||msl bound lower : 11000|
msl bound upper : 11000
|Controlling Facilities||tracon : ord|
|Make Model Name||Any Unknown or Unlisted Aircraft Manufacturer|
|Flight Phase||cruise other|
|Route In Use||enroute : direct|
|Affiliation||government : faa|
|Function||controller : approach|
|Qualification||controller : radar|
|Experience||controller radar : 8|
|Function||flight crew : single pilot|
|Qualification||pilot : private|
|Anomaly||altitude deviation : excursion from assigned altitude|
conflict : airborne less severe
non adherence : clearance
|Independent Detector||aircraft equipment other aircraft equipment : unspecified|
|Resolutory Action||flight crew : took evasive action|
|Miss Distance||vertical : 500|
|Primary Problem||Flight Crew Human Performance|
|Air Traffic Incident||Pilot Deviation|
Traffic was issued 3 times to air carrier X on the VFR at 10500 ft. Verified altitude being worked by another position. On the 3RD traffic call, air carrier X advised he was descending back to 11000 ft after responding to RA. There was a clearance deviation by the aircraft of 600 ft. Communication was after the maneuver had been accomplished. There was no reason for the aircraft to climb. The traffic was at a verified altitude and in no way was a factor.
Original NASA ASRS Text
Title: ACR X TCASII RA WITH VFR ACFT 500 FT BELOW.
Narrative: TFC WAS ISSUED 3 TIMES TO ACR X ON THE VFR AT 10500 FT. VERIFIED ALT BEING WORKED BY ANOTHER POS. ON THE 3RD TFC CALL, ACR X ADVISED HE WAS DSNDING BACK TO 11000 FT AFTER RESPONDING TO RA. THERE WAS A CLRNC DEV BY THE ACFT OF 600 FT. COM WAS AFTER THE MANEUVER HAD BEEN ACCOMPLISHED. THERE WAS NO REASON FOR THE ACFT TO CLB. THE TFC WAS AT A VERIFIED ALT AND IN NO WAY WAS A FACTOR.
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.