TM 1-6625-724-13&P0074 000074 00-5Figure 2. DC Power Cable InstallationPROCEDURE 2: MAGNETIC RPM SENSOR INSTALLATIONa. Remove the top two (of three) nuts on retaining bolts of the trunnion bearing assembly, figure 3, which islocated on the left cyclic non-rotating swashplate pitch horn.NOTEThe bolts should be installed with their heads to thefront-right (toward the centerline of the aircraft) and thenuts at the left-rear (outboard).b. Place the magnetic RPM sensor bracket (29312600) on the two bolts. Replace washers and nuts, and tightenthe nuts.c. Install magnetic RPM sensor (27288400) into the bracket, figure 3, with the connector away from the mast. Usea jam nut on each side of the bracket, figure 3 leaving them loose and with the top of the sensor extending aslittle 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 therotating swashplate.f. Place the single Magnetic RPM Striker Plate (29312700) with pointed flange down, at the left front of theswashplate.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 installlockwire.j. Connect Magnetic RPM sensor cable (29105403) to the Magnetic RPM sensor.
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