PLT OF A CESSNA 340 OVERSHOT ASSIGNED ALT ON DSCNT RESULTING IN APCH CTLR INTERVENTION AND RPTR'S RETURN TO ASSIGNED.

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IFR FLT FROM PLK TO MKC. NORMAL FLT ENROUTE TO MKC. KANSAS CITY CTR HANDED US OFF TO MKC APCH CTL. THEY GAVE US A CLRNC TURN TO A HDG OF 300 DEGS AND DSCNT TO 3000 FT. I ACKNOWLEDGED 300 DEGS AND DOWN TO 3000 FT. THE PIC PUT 3000 FT IN THE ALT ALERT AND STARTED DOWN TO 3000 FT. AT 3800 FT THE CTLR SAID; 'WHERE ARE YOU GOING?' I SAID TO 3000 FT AND HE REPLIED; 'NO; I SAID 4000 FT.' SINCE HE HAD CALLED WE HAD STOPPED AT 3800 FT AND RETURNED TO 4000 FT AND THE CTLR HAD SAID; 'NO PROB.' AFTER A FEW MINUTES HE GAVE US A CLRNC TO A 350 DEG HDG AND SAID; 'NOW I MEAN 3000 FT.' WE ACKNOWLEDGED THE HDG AND ALT AND THE FLT PROCEEDED NORMALLY FROM THAT POINT ON. THIS OCCURRED AT XA:15 ON NOV/XA/99 IN A CESSNA 340. SUPPLEMENTAL INFO FROM ACN 455802: IFR FLT FROM PLK TO MKC. NORMAL IFR FLT ENROUTE TO MKC. KANSAS CITY CTR HANDED US OFF TO MKC APCH CTL. THEY GAVE US A CLRNC TURN TO A HDG OF 300 DEGS AND A DSCNT TO 3000 FT. MY SIC ACKNOWLEDGED 300 DEGS AND DOWN TO 3000 FT. AT THE SAME TIME I PUT 3000 FT IN THE ALT ALERT AND MADE MY TURN AND DSCNT DOWN TO 3000 FT. DURING OUR DSCNT AT 3800 FT THE CTLR SAID; 'WHERE ARE YOU GOING ACFT X?' SIC REPLIED WE WERE DESCENDING TO 3000 FT. THE CTLR REPLIED; 'NO; I SAID 4000 FT.' SINCE HE HAD CALLED WE STOPPED OUR DSCNT AND PROMPTLY RETURNED TO 4000 FT AND THE CTLR HAD SAID 'NO PROB.' AFTER A FEW MINUTES HE GAVE US A CLRNC TO A 350 DEG HDG AND SAID; 'NOW I MEAN 3000 FT.' WE ACKNOWLEDGED THE CLRNC AND THE FLT PROCEEDED NORMALLY FROM THAT POINT ON. THIS OCCURRED AT XA:15 ON NOV/XA/99 IN A TWIN CESSNA 340.