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2-1.3 VIBRATION FREQUENCY IDENTIFIED AS 225 RPM (1 /REV)
TABLE 2-1.3. NORMAL ONE/REV VIBRATION LEVELS FWD AND AFT ROTOR A T 225 RPM

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM   55-1520-240-T 2-1.3 VIBRATION FREQUENCY IDENTIFIED AS 225 RPM (1 /REV) (Continued) 2-1.3 HAVE  PILOT  PERFORM  GROUND RUN AT 225 RPM, FLAT PITCH. MEASURE  GOUND  TRACK  ON BOTH  ROTORS  (TM  55-1520- 240-23)  WERE  BLADES  WITH- REPLACE  PITCH  LINKS  FOUND TO HAVE WORN BEARINGS. PERFORM  THIS  TASK  AGAIN FROM  THE  BEGINNING. CHECK  PITCH  LINK  BEARINGS. ARE  ANY  PITCH  LINK  BEARINGS WORN? 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.  RECORD HOVER  TRACK  ON  BOTH  ROTORS.  WERE  ALL  MEASURED  VIBRATION LEVELS  WITHIN  RANGES  OF  TABLE  2-1.3? LAND  HELlCOPTER.  SHUT DOWN  ENGINES.  CHECK  130 KNOT  BLADE  TRACK.  WERE BLADES WITHIN 1/2 INCH OF EACH   OTHER? HAVE  PILOT  ESTABLISH  130  KNOT  CRUISE  PROFILE.  RECORD  FWD  VERTl- CAL AND LATERAL AND AFT VERTICAL AND LATERAL VIBRATIONS IN IPS AND  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  BLADES WITHIN 1/2 INCH OF EACH OTHER AT 130 KNOTS. USE CALCULATED  ADJUSTMENT LAND  HELlCOPTER.  SHUT DOWN  ENGINES  CHECK  RE- USE  PITCH  LINK  ADJUSTMENT CORDED  HOVER  BLADE  TRACK, = 0 MARKS FOR INPUT TO PC WERE BLADES WITHIN 1/2 PITCH  LINK-LATERAL  PRO- INCH  OF  EACH  OTHER? GRAM. 1/REV   VIBRATION   LEVELS   ARE SATISFACTORY. AS  INPUT  TO  PC  PITCH  LINK- LATERAL    PROGRAM. USING  PC  PITCH  LINK-LATERAL  PROGRAM,  DETERMINE  VIBREX  TIP  WEIGHT CORRECTION TO COMPENSATE FOR ANY PITCH LINK ADJUSTMENT. AD- JUST  TIP  WEIGHTS  AS  NECESSARY  (TM  55-1520-240-23).  HAVE  PILOT ESTABLISH  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  BLADES WITHIN 1/2 INCH OF EACH ADJUST VIBREX BLADE TIP WEIGHTS (TM 55-1 520-240-23) TO CORRECT LATERAL VIBRATION USING LATEST HOVER INPUT DATA IN PC PITCH LINK-LATERAL   PROGRAM.   MAKE   NECESSARY   ADJUSTMENTS   AND   PER- FORM THIS TASK AGAIN BEGINNING WITH STABLE HOVER. ARE  RECORDED  VERTICAL  VI BRATION   LEVELS   WITHIN RANGES OF TABLE 2-1.3? OTHER.  USE  CALCULATED  AD- JUSTMENT AS INPUT TO PC PITCH  LINK-LATERAL  PRO- GRAM. REPLACE  PITCH  LINKS  FOUND TO  HAVE  WORN  BEARINGS. CHECK  PITCH  LINK  BEARINGS. PERFORM  THIS  TASK  AGAIN ARE  ANY  PlTCH  LINK  BEARINGS INSPECT  ROTOR  HEAD  ASSY. FROM THE BEGINNING. WORN? REF    TM    55-1520-240-23. TABLE   2-1.3.   NORMAL   ONE/REV   VIBRATION   LEVELS FWD  AND  AFT  ROTOR  A  T  225  RPM GO TO NEXT PAGE Change  5 2-5/(2-6 blank)







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