ACR MLG PERFORMS A GAR AT TWR'S REQUEST AFTER GOING VISUAL AT 100 FT AGL AFTER A MONITORED APCH TO ORD'S RWY 14R. ARPT VEHICLE HAD RPTED DEBRIS ON THAT RWY; PROBABLY FROM AN ACR B727 THAT HAD SLID 1500 FT OFF RWY 14R ABOUT 6 MINS PRIOR TO RPTR'S GAR. RPTR WANTS TO KNOW WHY ATC DIDN'T KNOW OF THIS SOONER SO AS TO PRECLUDE ANY ACFT; PARTICULARLY THEIRS; FROM MAKING AN APCH AND LNDG TO A DEBRIS CLUTTERED RWY.

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WE WERE VECTORED FOR A CAT II APCH AND LNDG ON RWY 14R. THE RPTED RVR WAS FLUCTUATING BTWN 1400 FT AND 2000 FT. WE CONDUCTED A CAT II MONITORED APCH PER SOP AFTER A THOROUGH BRIEFING. THE FO FLEW THE APCH. AT APPROX 150- 200 FT RA; SOME DISCUSSION ENSUED ON THE TWR FREQ BTWN AN ARPT VEHICLE AND THE ORD TWR. THE VEHICLE FIRST RPTED TO BE SHORT OF RWY 14L AND THEN CHANGED HIS MIND AND CLAIMED SHORT OF RWY 14R AND WAS WITNESSING DEBRIS ON THE RWY. THERE WAS A QUERY BY ORD TWR AS TO IF HE (THE VEHICLE) WAS CLR OF THE RWY. AFTER THE VEHICLE ANSWERED IN THE AFFIRMATIVE; THE TWR ACKNOWLEDGED THE DEBRIS RPT AND ISSUED US A CLRNC TO GAR. BY THIS POINT; I ALREADY HAD THE RWY ENVIRONMENT IN SIGHT; HAD DISPLACED THE FO FROM THE CTLS PER THE MONITORED APCH SOP; HAD DETERMINED THE REQUIREMENTS OF FAR 121.651(C) HAD BEEN MET AND HAD ANNOUNCED 'RWY IN SIGHT; LNDG.' MY IMPRESSION WAS THAT THIS WAS THE FIRST TIME THAT THE TWR WAS ADVISED OF ANY FOD OR ABNORMAL SIT TAKING PLACE ON RWY 14R. OUR GAR WAS INITIATED IN THE LNDG FLARE AT APPROX AB58Z. DUE TO THE GAR BEING INITIATED AT SUCH A LOW ALT; INCIDENTAL MAIN GEAR CONTACT WITH THE RWY RESULTED. A NORMAL PUBLISHED MISSED APCH PROC FOLLOWED. DURING THE MISSED APCH; THE PAX ON THE R SIDE OF THE ACFT WERE ABLE TO LOOK DOWN THROUGH THE OBSCURATION AND WITNESS A B727 THAT HAD DIVERTED OFF RWY 14R ON LNDG AND HAD COME TO REST ON ITS BELLY ABOUT 1500 FT OFF THE SIDE OF THE RWY. QUESTION REMAINS; WHY DID AN AIRPLANE LAND AFTER THAT EMER AND EVAC AND WHY DID ORD TWR NOT KNOW OF SUCH EMER 6 MINS AFTER IT HAD OCCURRED; ALLOWING US TO CONDUCT AN APCH TO THE RWY?