TM 1-1520-238-23 6-540 Change 4 6.131. INTERMEDIATE GEARBOX REMOVAL/INSTALLATION 6.131.1. Description This task covers: Removal. Cleaning. Inspection. Repair. Installation. 6.131.2. Initial Setup Tools: Aircraft maintenance tool kit (item 372, App H) Light duty laboratory apron (item 27, App H) 5/8 x 3/8-inch drive open end socket wrench crowfoot attachment (item 98, App H) Chemical protective gloves (item 154, App H) Adjustable air filtering respirator (item 262, App H) 10 - 50 inch-pound 1/4-inch drive click type torque wrench (item 434, App H) 0 - 300 inch-pound 3/8-inch drive click type torque wrench (item 439, App H) 0 - 75 inch-pound 1/4-inch drive dial indicator torque wrench (item 446, App H) Materials/Parts: Adhesive (item 18, App F) Cloth (item 52, App F) Corrosion preventive compound (item 62, App F) Epoxy primer coating kit (item 78, App F) Naphtha (item 127, App F) Sealing compound (item 177, App F) Personnel Required: 68D Aircraft Powertrain Repairer/NDI One person to assist 67R3F Attack Helicopter Repairer/Technical Inspector References: TM 1-1520-238-T Equipment Conditions: Ref Condition 1.57 Helicopter safed 2.2 Access fairings R475, L510, and R510 re- moved 6.11 No. 5 tail rotor drive shaft, damper, and anti- flail assemblies removed 6.12 Intermediate gearbox input coupling re- moved 6.13 Intermediate gearbox output coupling re- moved 6.14 No. 6 tail rotor drive shaft removed 6.130 Intermediate gearbox temperature sensors (top forward, top aft, and right side) re- moved 11.267 Directional F.S. 520 bellcrank removed WARNING FLIGHT SAFETY PART The intermediate gearbox and/or com- ponents of the intermediate gearbox are flight safety parts. Failure to follow maintenance instructions may result in serious injury or death of crewmembers and/or serious damage to the helicopter. GO TO NEXT PAGE M04-555-1