TM 1-6625-724-13&P
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Figure 2. DC Power Cable Installation
PROCEDURE 2: MAGNETIC RPM SENSOR INSTALLATION
a. Remove the top two (of three) nuts on retaining bolts of the trunnion bearing assembly, figure 3, which is
located on the left cyclic non-rotating swashplate pitch horn.
NOTE
The bolts should be installed with their heads to the
front-right (toward the centerline of the aircraft) and the
nuts at the left-rear (outboard).
b. Place the magnetic RPM sensor bracket (29312600) on the two bolts. Replace washers and nuts, and tighten
the nuts.
c. Install magnetic RPM sensor (27288400) into the bracket, figure 3, with the connector away from the mast. Use
a jam nut on each side of the bracket, figure 3 leaving them loose and with the top of the sensor extending as
little as possible. Nuts will be adjusted later.
d. Turn the head so that the WHITE blade is forward.
e. Remove the nuts and washers from two studs, figure 3, of the twelve studs located on the outer ring of the
rotating swashplate.
f. Place the single Magnetic RPM Striker Plate (29312700) with pointed flange down, at the left front of the
swashplate.
g. Replace washers and nuts, and tighten nuts.
h. Turn the rotor head slowly to line up the Magnetic RPM Striker Plate with the Magnetic RPM sensor.
i. Adjust the Magnetic RPM sensor for a 0.060-inch, ±0.010 inch, clearance, and tighten the jam nut and install
lockwire.
j. Connect Magnetic RPM sensor cable (29105403) to the Magnetic RPM sensor.
