5-1.2 CENTRIFUGAL DROOP STOP OPERATIONAL CHECK

CENTRIFUGAL DROOP STOP VISUAL CHECK (Continued)

5-2.1 ROTOR TRACKING AND BALANCING SYSTEM WIRING DIAGRAM

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM 55-1520-240-T 5-1.2 CENTRIFUGAL DROOP STOP OPERATIONAL CHECK 5-1.2 INITIAL SETUP Equipment Condition: TM 55-1520-240-23: Applicable Configurations: Battery Connected All Electrical Power On Hydraulic Power On Tools: Centrifugal Droop Stop Visual Check Com- None pleted (Task 5-1.1) Materials: None General Safety Instructions: Personnel Required: 100C0 Army Rotary Wing Aviator (2) When rotors are turning, use care 67U20 Medium Helicopter Repairer outside helicopter. Stay outside rotor disk area in front of heli- References: copter. Do not climb on top of TM 55-1520-240-23 helicopter until blades stop. TM 55-1520-240-10 Serious injury or loss of life can occur if personnel are struck by a moving blade. 1. Have pilot start engines and stabilize rotors at Observe that weights remain in cut-in position (1). ground idle rpm. NOTE Balancing weights are visible during rotation. Weights can be seen at cut- in position (1) (stop engaged) or at cut-out position (2) (stop disen- gaged) 2. Have pilot operate engines at flight rpm. 3. Have pilot shut down both engines. A balancing arm and weight that does not return to cut-in position (stop engaged) will cause a hazardous blade condition during shutdown in gusty weather. Observe that weights have moved to cutout posi- tion (2) as rotor speed increases to flight rpm. As blades slow down, note rotor rpm at which balancing arms and weights return to cut-in posi- tion. Balancing arm and weights shall reach cut-in position at about ground idle rpm. If not refer to TM 55-1520-240-23. FOLLOW-ON MAINTENANCE: TM 55-1520-240-23: Battery Disconnected Electrical Power Off Hydraulic Power Off No. 1 and No. 2 Engines Shut Down Droop Stop Shrouds Installed END OF TASK 5-4

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