Figure 2-32. Power Train

TM 1-1520-238-10 2-57 M01-020 TAIL ROTOR STATIC MAST TAIL ROTOR GEARBOX FLEXIBLE COUPLING (TYPICAL) TAIL ROTOR AND INTERMEDIATE GEARBOX COOLING FAN TAIL ROTOR DRIVE SHAFTING HANGER BEARING (TYPICAL) ANTIFLAIL SLEEVE STATIC MAST MAIN ROTOR DRIVE SHAFT COOLING FANS (2) MAIN TRANSMISSION INPUT DRIVE SHAFTS (2) NOSE GEARBOX (2) APU DRIVE SHAFT DRIVE SHAFT DAMPER DRIVE SHAFT DAMPER ANTIFLAIL SLEEVE INTERMEDIATE GEARBOX Figure 2-32. Power Train b. Main Transmission Caution Lights. Sensors in the transmission sense adverse conditions which are dis- played as caution lights (fig 2-44) in the crew stations. The pilot station has six caution/warning lights: OIL PSI MAIN XMSN 1, OIL PSI MAIN XMSN 2, OIL HOT MAIN XMSN 1, OIL HOT MAIN XMSN 2, CHIPS MAIN XMSN, and OIL PSI ACC PUMP. Activation of any of these lights, except the OIL PSI ACC PUMP, simultaneously illumi- nates either MAIN 1, MAIN XMSN 2, or CHIPS MAIN XMSN on the CPG caution/warning panel. 2.40.3 Rotor Brake. The rotor brake reduces turn- around time for aircraft loading and servicing and pre- vents windmilling of the rotor system during gusty wind conditions. The rotor brake disc is visible at the aft end of the transmission. CAUTION With rotors turning, do not place the RTR BK switch in LOCK position. NOTE � When engaging rotor lock, pause in the BRAKE position until the RTR BK cau- tion/warning light has illuminated prior to placing the switch in the lock position. The PWR levers will not advance past the ground idle detent with the rotor brake switch in the LOCK position. � When operating engines with the rotor brake locked, monitor the main transmis- sion temperature. If the transmission temperature reaches 130 �C (266 �F), se- cure operation, or release the rotor brake and turn the rotors until transmission tem- perature returns to normal.