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Small transport was issued a descent, but maintained altitude and caused a confliction with another aircraft.
| Attributes | |
| ACN | 108954 |
| Time | |
| Date | 198904 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mdw |
| State Reference | IL |
| Altitude | msl bound lower : 4000 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : odr |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Recip Eng |
| Flight Phase | cruise other descent : approach |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Small Transport, Low Wing, 2 Turboprop Eng |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 90 flight time total : 3600 flight time type : 350 |
| ASRS Report | 108954 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : clearance |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 700 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On approach into mdw at 4000', being vectored, the controller then told me to maintain a lower altitude and to intercept the NDB runway 4R approach course. I rogered the clearance, but never reported leaving 4000'. The controller told me that I was 12 mi from cadon and cleared me for the approach. The approach plate for mdw specifies cross cadon at 4000', then descend. Unsure of my altitude, I stayed at 4000' until the controller started screaming that he wanted me down 'right now.' I was just outside of cadon. I was in conflict with an small transport. I dove the aircraft and the small transport climbed. We missed each other by a good distance. I then continued the approach from that point. I do think, if the controller wanted me down right then, he should have said so by stating, 'I need you out of 4000' now.' I should have verified the approach instructions, but the frequency was very busy. I should have read the fine print on the chart which said I could be outside of cadon at 2600' when authority/authorized by ATC.
Original NASA ASRS Text
Title: SMT WAS ISSUED A DESCENT, BUT MAINTAINED ALT AND CAUSED A CONFLICTION WITH ANOTHER ACFT.
Narrative: ON APCH INTO MDW AT 4000', BEING VECTORED, THE CTLR THEN TOLD ME TO MAINTAIN A LOWER ALT AND TO INTERCEPT THE NDB RWY 4R APCH COURSE. I ROGERED THE CLRNC, BUT NEVER RPTED LEAVING 4000'. THE CTLR TOLD ME THAT I WAS 12 MI FROM CADON AND CLRED ME FOR THE APCH. THE APCH PLATE FOR MDW SPECIFIES CROSS CADON AT 4000', THEN DSND. UNSURE OF MY ALT, I STAYED AT 4000' UNTIL THE CTLR STARTED SCREAMING THAT HE WANTED ME DOWN 'RIGHT NOW.' I WAS JUST OUTSIDE OF CADON. I WAS IN CONFLICT WITH AN SMT. I DOVE THE ACFT AND THE SMT CLBED. WE MISSED EACH OTHER BY A GOOD DISTANCE. I THEN CONTINUED THE APCH FROM THAT POINT. I DO THINK, IF THE CTLR WANTED ME DOWN RIGHT THEN, HE SHOULD HAVE SAID SO BY STATING, 'I NEED YOU OUT OF 4000' NOW.' I SHOULD HAVE VERIFIED THE APCH INSTRUCTIONS, BUT THE FREQ WAS VERY BUSY. I SHOULD HAVE READ THE FINE PRINT ON THE CHART WHICH SAID I COULD BE OUTSIDE OF CADON AT 2600' WHEN AUTH BY ATC.
Data retrieved from NASA's ASRS site as of August 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.