TM 1-1520-240-MTF4-15b. Measure distance that either bellcrank endmoves. If a bellcrank moves more than 3/8inch, there is excess looseness in thisportion of control system.c. Isolate cause of excess looseness. (Referto TM 55-1520-240-23, Ch. 11.)F. ROTOR PHASING.1-31.Reference:TM 55-1520-240-23WARNINGImproper phasing can result in injury to per-sonnel and serious damage to helicopter.Whenever the rotary-wing system has beendephased or components of the drive system(except the engine drive shafts or engineXMSN’s) have been removed or discon-nected, the system must be properly phasedbefore the system is operated. The method ofchecking or obtaining proper phase relation-ship of the rotors is given in the above refer-ence.WARNINGPhasing requires alignment of the swivelingactuators with the rotating swashplates. Donot perform any alignments using pivotingactuators. The swiveling actuator on the for-ward rotor is located on the left side of theswashplate and the swiveling actuator on theaft rotor is on the right side of the swashplate.
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