CTURE AROUND OPENINGS - NUMBER 3 WINDOW FRAME - INSPECTION AND FREEZE PLUG INSTALLATION. SERVICE BULLETIN (HFEC) INSPECTION OF THE AFFECTED NUMBER 3 WINDOW FRAME FASTENER HOLES FOR CRACKS. COLD WORK AND INSTALL FREEZE PLUGS IN AFFECTED NUMBER 3 WINDOW FRAME HOLES MOS AFL INSTALL FUSELAGE - STRUCTURE AROUND OPENINGS - NUM