Narrative:

Reporter serving as PIC of cpr gulfstream giv on IFR flight plan from ewr to sus. Initial cruise altitude of FL430 to avoid reported turbulence at FL310-FL390 by all types. Initial descent clearance issued to FL350 accomplished at .80 mach and resulting in 1500 FPM descent rate. Further cleared to FL240 while in descent. Started to encounter continuous light chop and programmed FMS for .78 mach descent until 300 KTS true was intercepted. (This generally happens between FL300-FL280.) while we continued our descent, ATC asked our descent rate which was reported at 1200 FPM, as our descent rate decreased as our speed was decreasing. The controller requested a minimum of 2000 FPM until level at FL240. We acknowledged and complied with the clearance. At FL250 ATC issued TA of airliner (also traveling wbound) at FL250. We were not visual with the traffic but he was showing on our TCASII equipment (2 O'clock and 5 mi distant). At FL248 ATC asked if we were level at FL240 yet. We reported negative passing FL248 for FL240. At this time the conflicting traffic was sighted visually. Moments later we reported level at FL240. No evasive action was taken or required and there were no TA's or RA's issued given by our TCASII equipment. I feel the controller acted responsibly to see that separation was maintained. It is a busy corridor going into the st louis area and morning traffic loads were heavy. The controller was professional and we appreciate the fine job that they do and are grateful for their diligence.

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Original NASA ASRS Text

Title: A CPR GIV PIC RPT REGARDING LACK OF SEPARATION DURING DSCNT THROUGH OCCUPIED ALT NEAR TTH, IN.

Narrative: RPTR SERVING AS PIC OF CPR GULFSTREAM GIV ON IFR FLT PLAN FROM EWR TO SUS. INITIAL CRUISE ALT OF FL430 TO AVOID RPTED TURB AT FL310-FL390 BY ALL TYPES. INITIAL DSCNT CLRNC ISSUED TO FL350 ACCOMPLISHED AT .80 MACH AND RESULTING IN 1500 FPM DSCNT RATE. FURTHER CLRED TO FL240 WHILE IN DSCNT. STARTED TO ENCOUNTER CONTINUOUS LIGHT CHOP AND PROGRAMMED FMS FOR .78 MACH DSCNT UNTIL 300 KTS TRUE WAS INTERCEPTED. (THIS GENERALLY HAPPENS BTWN FL300-FL280.) WHILE WE CONTINUED OUR DSCNT, ATC ASKED OUR DSCNT RATE WHICH WAS RPTED AT 1200 FPM, AS OUR DSCNT RATE DECREASED AS OUR SPD WAS DECREASING. THE CTLR REQUESTED A MINIMUM OF 2000 FPM UNTIL LEVEL AT FL240. WE ACKNOWLEDGED AND COMPLIED WITH THE CLRNC. AT FL250 ATC ISSUED TA OF AIRLINER (ALSO TRAVELING WBOUND) AT FL250. WE WERE NOT VISUAL WITH THE TFC BUT HE WAS SHOWING ON OUR TCASII EQUIP (2 O'CLOCK AND 5 MI DISTANT). AT FL248 ATC ASKED IF WE WERE LEVEL AT FL240 YET. WE RPTED NEGATIVE PASSING FL248 FOR FL240. AT THIS TIME THE CONFLICTING TFC WAS SIGHTED VISUALLY. MOMENTS LATER WE RPTED LEVEL AT FL240. NO EVASIVE ACTION WAS TAKEN OR REQUIRED AND THERE WERE NO TA'S OR RA'S ISSUED GIVEN BY OUR TCASII EQUIP. I FEEL THE CTLR ACTED RESPONSIBLY TO SEE THAT SEPARATION WAS MAINTAINED. IT IS A BUSY CORRIDOR GOING INTO THE ST LOUIS AREA AND MORNING TFC LOADS WERE HVY. THE CTLR WAS PROFESSIONAL AND WE APPRECIATE THE FINE JOB THAT THEY DO AND ARE GRATEFUL FOR THEIR DILIGENCE.

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.