Narrative:

We were being vectored for a localizer approach runway 27 in moline, il, at 2400 ft. Flying time from takeoff in peoria, il, to landing in moline was 18 mins. Short time required rapid briefing of approach and completion of required checklists. We were also asked by ATC to stay at 210 KTS until the final approach fix for inbound traffic behind us. We were cleared for the localizer approach and intercepted the localizer outside of donna, an intersection 8.3 mi outside of gruen, the final approach fix. As we crossed donna we descended out of 2400 ft for 1100 ft thinking we had crossed the final approach fix. We had contact visually with the ground shortly after leaving 2400 ft, but flew in on the localizer below the required altitude for approximately 6 mi. We received an altitude alert/GPWS warning about the time the tower asked us to check our altitude. We climbed up to a visual GS and continued to a normal landing. Contributing factors: short flight time. High speed to final approach fix. Lack of confirmation between crew members to verify proper altitudes on approach at each fix.

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Original NASA ASRS Text

Title: ACR MLG FAILED TO FOLLOW ALT XING RESTRICTIONS WHILE ON A LOC APCH TO MLI.

Narrative: WE WERE BEING VECTORED FOR A LOC APCH RWY 27 IN MOLINE, IL, AT 2400 FT. FLYING TIME FROM TKOF IN PEORIA, IL, TO LNDG IN MOLINE WAS 18 MINS. SHORT TIME REQUIRED RAPID BRIEFING OF APCH AND COMPLETION OF REQUIRED CHKLISTS. WE WERE ALSO ASKED BY ATC TO STAY AT 210 KTS UNTIL THE FINAL APCH FIX FOR INBOUND TFC BEHIND US. WE WERE CLRED FOR THE LOC APCH AND INTERCEPTED THE LOC OUTSIDE OF DONNA, AN INTXN 8.3 MI OUTSIDE OF GRUEN, THE FINAL APCH FIX. AS WE CROSSED DONNA WE DSNDED OUT OF 2400 FT FOR 1100 FT THINKING WE HAD CROSSED THE FINAL APCH FIX. WE HAD CONTACT VISUALLY WITH THE GND SHORTLY AFTER LEAVING 2400 FT, BUT FLEW IN ON THE LOC BELOW THE REQUIRED ALT FOR APPROX 6 MI. WE RECEIVED AN ALT ALERT/GPWS WARNING ABOUT THE TIME THE TWR ASKED US TO CHK OUR ALT. WE CLBED UP TO A VISUAL GS AND CONTINUED TO A NORMAL LNDG. CONTRIBUTING FACTORS: SHORT FLT TIME. HIGH SPD TO FINAL APCH FIX. LACK OF CONFIRMATION BTWN CREW MEMBERS TO VERIFY PROPER ALTS ON APCH AT EACH FIX.

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.