TM 55-1520-240-T2-1.3 VIBRATION FREQUENCY IDENTIFIED AS 225 RPM (1 /REV) (Continued)2-1.3 HAVE PILOT PERFORM GROUNDRUN AT 225 RPM, FLAT PITCH.MEASURE GOUND TRACK ONBOTH ROTORS (TM 55-1520-240-23) WERE BLADES WITH-REPLACE PITCH LINKS FOUNDTO HAVE WORN BEARINGS.PERFORM THIS TASK AGAINFROM THE BEGINNING.CHECK PITCH LINK BEARINGS.ARE ANY PITCH LINK BEARINGSWORN?IN 3/8 INCH OF EACH OTHER?HAVE PILOT ESTABLISH STABLE HOVER TUNE VIBREX TO 225 RPM. RE-CORD FORWARD ROTOR vERTICAL AND LATERAL AND AFT ROTOR VERTl-CAL AND LATERAL VIBRATIONS IN IPS AND CLOCK ANGLES. RECORDHOVER TRACK ON BOTH ROTORS. WERE ALL MEASURED VIBRATIONLEVELS WITHIN RANGES OF TABLE 2-1.3?LAND HELlCOPTER. SHUTDOWN ENGINES. CHECK 130KNOT BLADE TRACK. WEREBLADES WITHIN 1/2 INCH OFEACH OTHER?HAVE PILOT ESTABLISH 130 KNOT CRUISE PROFILE. RECORD FWD VERTl-CAL AND LATERAL AND AFT VERTICAL AND LATERAL VIBRATIONS IN IPSAND CLOCK ANGLE RECORD IN-FLIGHT TRACK ON BOTH ROTORS ARE Vl-BRATION LEVELS WITHIN RANGES OF TABLE 2-1.3?CALCULATE PITCH LINK AD-JUSTMENT TO BRING BLADESWITHIN 1/2 INCH OF EACHOTHER AT 130 KNOTS. USECALCULATED ADJUSTMENTLAND HELlCOPTER. SHUTDOWN ENGINES CHECK RE-USE PITCH LINK ADJUSTMENTCORDED HOVER BLADE TRACK,= 0 MARKS FOR INPUT TO PCWERE BLADES WITHIN 1/2PITCH LINK-LATERAL PRO-INCH OF EACH OTHER?GRAM.1/REV VIBRATION LEVELS ARESATISFACTORY.AS INPUT TO PC PITCH LINK-LATERAL PROGRAM.USING PC PITCH LINK-LATERAL PROGRAM, DETERMINE VIBREX TIP WEIGHTCORRECTION TO COMPENSATE FOR ANY PITCH LINK ADJUSTMENT. AD-JUST TIP WEIGHTS AS NECESSARY (TM 55-1520-240-23). HAVE PILOTESTABLISH STABLE HOVER. MEASURE FORWARD AND AFT ROTOR VIBRA-TIONS. ARE ALL VIBRATION LEVELS WITHIN RANGES OF TABLE 2-1.3?CALCULATE PITCH LINK AD-JUSTMENT TO BRING BLADESWITHIN 1/2 INCH OF EACHADJUST VIBREX BLADE TIP WEIGHTS (TM 55-1 520-240-23) TO CORRECTLATERAL VIBRATION USING LATEST HOVER INPUT DATA IN PC PITCHLINK-LATERAL PROGRAM. MAKE NECESSARY ADJUSTMENTS AND PER-FORM THIS TASK AGAIN BEGINNING WITH STABLE HOVER.ARE RECORDED VERTICAL VIBRATION LEVELS WITHINRANGES OF TABLE 2-1.3?OTHER. USE CALCULATED AD-JUSTMENT AS INPUT TO PCPITCH LINK-LATERAL PRO-GRAM.REPLACE PITCH LINKS FOUNDTO HAVE WORN BEARINGS.CHECK PITCH LINK BEARINGS.PERFORM THIS TASK AGAINARE ANY PlTCH LINK BEARINGSINSPECT ROTOR HEAD ASSY.FROM THE BEGINNING.WORN?REF TM 55-1520-240-23.TABLE 2-1.3. NORMAL ONE/REV VIBRATION LEVELSFWD AND AFT ROTOR A T 225 RPMGO TO NEXT PAGEChange 52-5/(2-6 blank)
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