What was found
ACTC=4354, DURING PHASE 10 INSP, FOUND HORIZONTAL STAB FWD SPAR BENT AND CRACKED, IN THE CENTER WEB AREA, IN BETWEEN THE FWD ATTACH POINTS. MFG CUSTOMER SERVICE AND ENGINEERING WERE CONTACTED AND SENT PHOTOS. OPERATOR SUSPECTS ACFT CLEANING PERSONNEL STANDING ON TOP OF HORIZ STAB DURING CLEANING OPERATION. THIS PRACTICE WILL NO LONGER BE ALLOWED. ALSO, LARGE RED "NO STEP" PLACARDS WILL BE OPSITIONED ON TOP OF LT AND RT HORIZ STAB OF THESE ACFT.