What was found
WHILE ACFT WAS IN FOR HEAVY CHECK. MX REPORTED A 0.5" CRACK ON THE RT HORIZONTAL RIB SPAR SUPPORT, INBD OF THE RT OTBD PCU. MX R & R THE CRACKED RIB (WEB RIB 7) SUPPORT IAW SRM 51-40-02, 51-41-01 & 51-41-02. ACFT IS CURRENTLY STILL OUT OF SERVICE FOR HEAVY CHECK COMPLETION.