TM 55-1520-240-T5-1.2 CENTRIFUGAL DROOP STOP OPERATIONAL CHECK5-1.2INITIAL SETUPEquipment Condition:TM 55-1520-240-23:Applicable Configurations:Battery ConnectedAllElectrical Power OnHydraulic Power OnTools:Centrifugal Droop Stop Visual Check Com-Nonepleted (Task 5-1.1)Materials:NoneGeneral Safety Instructions:Personnel Required:100C0 Army Rotary Wing Aviator (2)When rotors are turning, use care67U20 Medium Helicopter Repaireroutside helicopter. Stay outsiderotor disk area in front of heli-References:copter. Do not climb on top ofTM 55-1520-240-23helicopter until blades stop.TM 55-1520-240-10Serious injury or loss of life canoccur if personnel are struck by amoving blade.1. Have pilot start engines and stabilize rotors atObserve that weights remain in cut-in position (1).ground idle rpm.NOTEBalancing weights are visible duringrotation. Weights can be seen at cut-in position (1) (stop engaged) or atcut-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 thatdoes not return to cut-in position(stop engaged) will cause ahazardous blade condition duringshutdown 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 whichbalancing arms and weights return to cut-in posi-tion. Balancing arm and weights shall reach cut-inposition at about ground idle rpm. If not refer toTM 55-1520-240-23.FOLLOW-ON MAINTENANCE:TM 55-1520-240-23:Battery DisconnectedElectrical Power OffHydraulic Power OffNo. 1 and No. 2 Engines Shut DownDroop Stop Shrouds InstalledEND OF TASK5-4
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