Narrative:

We are on the qball STAR arrival into stl. Autoplt is on. ZKC gave us a clearance to hold at rackk intersection at 14000 ft. Normal crossing altitude at rackk is 11000 ft. First officer was distracted by holding clearance and neglected to put 14000 ft in altitude alerter per our normal company procedure. Crew engaged in discussing approach into stl, WX and some personal matters when ZKC called and gave clearance to 11000 ft as we were passing 12000 ft. No other aircraft shown on TCASII at the time of altitude deviation. Cause: first officer failure to follow company procedure. Captain failure to verify altitude placed in alerter. Captain allowed to become distracted from flying duties and not catching deviation from normal controller clearance to cross rackk at 11000 ft.

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Original NASA ASRS Text

Title: ALTDEV ALT OVERSHOT. ACR CREW CONTINUES ITS DSCNT TOWARD THEIR EXPECTED ALT AND GOES THROUGH THEIR ASSIGNED ALT.

Narrative: WE ARE ON THE QBALL STAR ARR INTO STL. AUTOPLT IS ON. ZKC GAVE US A CLRNC TO HOLD AT RACKK INTXN AT 14000 FT. NORMAL XING ALT AT RACKK IS 11000 FT. FO WAS DISTRACTED BY HOLDING CLRNC AND NEGLECTED TO PUT 14000 FT IN ALT ALERTER PER OUR NORMAL COMPANY PROC. CREW ENGAGED IN DISCUSSING APCH INTO STL, WX AND SOME PERSONAL MATTERS WHEN ZKC CALLED AND GAVE CLRNC TO 11000 FT AS WE WERE PASSING 12000 FT. NO OTHER ACFT SHOWN ON TCASII AT THE TIME OF ALTDEV. CAUSE: FO FAILURE TO FOLLOW COMPANY PROC. CAPT FAILURE TO VERIFY ALT PLACED IN ALERTER. CAPT ALLOWED TO BECOME DISTRACTED FROM FLYING DUTIES AND NOT CATCHING DEV FROM NORMAL CTLR CLRNC TO CROSS RACKK AT 11000 FT.

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.