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2-1.1  VIBRATION  ANALYSIS  SYSTEMATIC  APPROACH
2-1.2  VIBRATION  ANALYSIS  VISUAL  CHECK  (Continued)

TM-55-1520-240-T-1 CH-47D Heilcopter Manual
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TM   55-1520-240-T 2-1.2  VIBRATION  ANALYSIS  VISUAL  CHECK 2-1.2 INITIAL  SETUP Applicable Configurations: All Tools: Aircraft  Mechanic's  Tool  Kit, NSN   5180-00-323-4692 Materials: None Personnel Required: Medium  Helicopter  Repairer  (2) References: TM   55-1520-240-23 Equipment Condition: TM   55-1520-240-23: Battery   Disconnected Electrical  Power  Off Hydraulic  Power  Off Forward   Transmission   Work   Platform   Open Pylon  Work  Platforms  Open Forward  and  Aft  Pivoting  and  Swiveling  Servo- cylinders   Inspected TASK RESULT TASK RESULT 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Attach  tiedown  line  (1)  to  a  forward  blade. Position  aft  blade  (2)  over  fuselage  (3).  Check aft blade (2). Repeat  step  2  on  remaining  two  aft  blades. Then  go  to  step  4. Position  forward  blade  (4)  over  fuselage  (3). Check  forward  forward  blade  (4). Repeat  step  4  on  remaining  two  forward blades. Check  three  forward  pitch  links  (5). Check  forward  LCT  actuator  (6). Check  forward  LCT  connecting  link  (7). Check  three  aft  pitch  links  (8). Check aft LCT actuator (9). If  blade  (2)  is  damaged,  replace  it. If  blade  (4)  is  damaged,  replace  it. If  any  pitch  link  (5)  is  damaged,  has  worn  bearings, or  loose  attaching  hardware,  tighten  hardware  or  re- place  pitch  link  as  required. If  actuator  (6)  is  damaged,  has  worn  bearings,  or loose  attaching  hardware,  tighten  hardware  or  re- place  actuator  as  required. If  link  (7)  is  damaged,  has  worn  bearings,  or  loose attaching  hardware,  tighten  hardware  or  replace  link as required. If  any  pitch  link  (8)  is  damaged,  has  worn  bearings, or  loose  attaching  hardware,  tighten  hardware  or  re- place  pitch  link  as  required. If  actuator  (9)  is  damaged,  has  worn  bearings,  or loose  attaching  hardware,  tighten  hardware  or  re- place  actuator  as  required. 11.  Check  aft  LCT  connecting  link  (10). If  link  (10)  is  damaged,  has  worn  bearings,  or  loose attaching  hardware,  tighten  hardware  or  replace  link as  required. 12.  Check  rotor  hub  nut  (11). If  nut  (11)  is  loose,  tighten  it.  If  nut  (11)  is  bottomed on   splines,   refer   to   TM   55-1520-240-23. 13.  Check  torque  on  vertical  hinge  pin  (12). If  vertical  hinge  pin  (12)  is  not  properly  torqued, tighten  to  proper  torque. 14.  Check  all  sync  shaft  mounting  and  coupling If  any  bolts  are  loose  or  damaged,  tighten  or  replace bolts,  engine  drive  shaft  coupling  bolts,  for- them  as  required. ward,  aft,  combining,  and  engine  transmission mounting   bolts   for   proper   torque   and/or   wear. FOLLOW-ON  MAINTENANCE: TM   55-1520-240-23: Forward   transmission   work   platform   closed. Pylon  work  platform  closed. GO TO NEXT PAGE 2-4 Change 5 (Page 2-3 is a blank page.)







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