AN ACR B737 CROSSED THE ACTIVE RWY 4R AT TXWY E AS AN ATX PA23 WAS XING THE LNDG THRESHOLD ON THAT RWY. FACILITY REPRESENTATIVE BLAMES POOR CTLR CHAIRS FOR CTLRS NOT BEING ABLE TO SEE THE RWYS. FACILITY MGMNT SAID THIS WAS AN OPERROR.

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FAA MGMNT CONCLUDED INCIDENT WAS AN OPERROR; FAILURE TO SCAN BY LCL CTLR. ACR Y WAS XING RWY 4L AT TXWY E FROM RWY 4R; SMT X WAS OVER LNDG THRESHOLD. DURING SUBSEQUENT CONFERENCES WITH INVESTIGATOR-IN-CHARGE; THIS INDIVIDUAL DOES NOT CONCEDE TO OUR RECOMMENDATIONS THAT THERE WAS; IN FACT; ENVIRONMENTAL CONDITIONS WHICH ARE PERTINENT TO THE OPERROR. MGMNT DOES NOT BELIEVE THE RWY 8L NOTAMED CLOSURE IS PERTINENT. HOWEVER; ON A DAILY BASIS; FLOW CTL IS INSTITUTED FOR THIS CLOSURE TO ASSIST IN LIMITED AIRSPACE FOR TRACON FUNCTIONS AND FOR TWR FOR RWY ACCEPTANCE RATES. ADDITIONALLY; THE 'DOMORE' HYD CTLR CHAIRS HAVE BEEN MADE INOP FOR FULL EXTENSION TO VIEW RWYS AND TXWYS FOR SEVERAL MONTHS. THIS IS PER FAA DIRECTIVES FOR SAFETY. CHAIRS WERE SUPPOSED TO BE REPAIRED BY THE LAST WK OF OCT/XX/96. AS OF JAN/XX/96; THIS HAS NOT BEEN COMPLETED; NOR STARTED. ALL POS IN CABIN HAVE LIMITED OR BLOCKED VIEWING OF ACTIVE RWYS OR TXWYS DUE TO LOW CHAIR HT; BLOCKED BY COUNTERS AND BRITE RADARS -- LCL WAS ASSISTED BY CABIN COORDINATOR WHO COULD NOT VIEW LOCATION OF OCCURRENCE.