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Learjet 31 flight crew directed to descend by ATC due to possible incursion into the floor of the ord TCA.
| Attributes | |
| ACN | 445570 |
| Time | |
| Date | 199908 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : pwk.airport |
| State Reference | IL |
| Altitude | msl single value : 3500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : ugn.tower tower : pwk.tower tower : den.tower |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 31 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | cruise : level |
| Route In Use | enroute : on vectors |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : corporate |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : multi engine pilot : flight engineer |
| Experience | flight time last 90 days : 120 flight time total : 4300 flight time type : 70 |
| ASRS Report | 445570 |
| Person 2 | |
| Affiliation | company : corporate |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi |
| ASRS Report | 445561 |
| Events | |
| Anomaly | airspace violation : entry non adherence : published procedure non adherence : far |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : exited penetrated airspace |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Problem Areas | ATC Human Performance Airspace Structure Flight Crew Human Performance |
| Primary Problem | ATC Human Performance |
Narrative:
We were approximately 9-10 mi north of pwk en route to ugn. I was flying and had leveled the aircraft at 3500 ft MSL. We were advised almost immediately after leveling off to descend below 3000 ft to remain clear of the ord class B. (Advisory came from pwk tower.) the descent to 3000 ft was made immediately. We believed ourselves to be in compliance because the class B shelf is 3600 ft over northbrook VOR, where we thought we were. We were not able to positively identify northbrook as we had been vectored around traffic, then advised to go direct -- as such, it wasn't in the FMS or in navigation #1 or #2. For this short a trip, I believe it would be wise to leave all fixes in the FMS to aid in situational awareness.
Original NASA ASRS Text
Title: LEARJET 31 FLC DIRECTED TO DSND BY ATC DUE TO POSSIBLE INCURSION INTO THE FLOOR OF THE ORD TCA.
Narrative: WE WERE APPROX 9-10 MI N OF PWK ENRTE TO UGN. I WAS FLYING AND HAD LEVELED THE ACFT AT 3500 FT MSL. WE WERE ADVISED ALMOST IMMEDIATELY AFTER LEVELING OFF TO DSND BELOW 3000 FT TO REMAIN CLR OF THE ORD CLASS B. (ADVISORY CAME FROM PWK TWR.) THE DSCNT TO 3000 FT WAS MADE IMMEDIATELY. WE BELIEVED OURSELVES TO BE IN COMPLIANCE BECAUSE THE CLASS B SHELF IS 3600 FT OVER NORTHBROOK VOR, WHERE WE THOUGHT WE WERE. WE WERE NOT ABLE TO POSITIVELY IDENT NORTHBROOK AS WE HAD BEEN VECTORED AROUND TFC, THEN ADVISED TO GO DIRECT -- AS SUCH, IT WASN'T IN THE FMS OR IN NAV #1 OR #2. FOR THIS SHORT A TRIP, I BELIEVE IT WOULD BE WISE TO LEAVE ALL FIXES IN THE FMS TO AID IN SITUATIONAL AWARENESS.
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.