Phasing the rotary-wing system shall be accom-
plished with a minimum crew of two; one crewman
to install the phasing blocks and one to turn the for-
ward rotor blades.
1. Rotor Phasing.
a. Obtain two phasing blocks. If necessary,
locally manufacture them from aluminum
alloy sheet, 3/8 inch thick,
b. Gain access to the right side of the aft
swashplate. Rotate the rotor head to align a
pitch link lug on the rotating swashplate with
the upper flange of the swiveling actuator.
c. Install one phasing block over the lug and
the flange. Leave in place.
d. Gain access to the left side of the forward
swashplate. If the rotor system is properly
phased, a pitch lug on the rotating
swashplate will align with the upper flange of
the swiveling actuator. Install a phasing
block over the lug and flange to verify
e. If the lug and flange are not in alignment, the
rotor system must be phased. Refer to TM
55-1520-240-23 for procedure.
G. 712 NO. 1 and NO. 2 ENGINE START
The flight controls must be manned anytime
the helicopter is on the ground with the rotors