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VIBRATION  CORRECTION  PROCEDURE  (AVIATION  VIBRATION ANALYZER)     (Continued) - TM-55-1520-240-23-5_731
VIBRATION  CORRECTION  PROCEDURE  (AVIATION  VIBRATION ANALYZER)     (Continued) - TM-55-1520-240-23-5_733

TM-55-1520-240-23-5 CH-47D Heilcopter Manual
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TM 55-1520-240-23-5 6-217 VIBRATION  CORRECTION  PROCEDURE  (AVIATION  VIBRATION ANALYZER)     (Continued) 6-217 10. Repeat step 4.  If check is still unsatisfactory, continue with step 11. 11. Perform engine drive shaft vibration check with No.  1 engine at minimum beep and rpm re-established at 100 percent  with No.  2 engine only. 12. Repeat the check of step 11 with No.  2 engine at minimum beep and rpm re-established at  100 percent with No.  1 engine only. 13. Shut down engines (TM 1-1520-240-10). NOTE No. 2 engine drive shaft is shown. No.  1 shaft is similar. 14. Compare vibration readings of steps 11 and 12. If readings of step 12 are higher, perform steps a thru d on No. 2 engine drive shaft (3). If readings of step 11 are higher, perform steps a thru d on No.  1 shaft. a. Match-mark adapters (1 and 2) to shaft (3). Use a marking pencil (E270.1). b. Remove shaft (3) (Task 6-30). c. Remove adapter (2) from combining transmission (6) (Task 6-30).  Rotate it  90 clockwise facing combining transmission input pinion and reinstall it (Task 6-32). d. Align match-marks on adapters (1 and 2) and shaft (3).  Reinstall the shaft (Task 6-32). 15. Repeat step 6.  If check is still unsatisfactory, repeat steps 11 thru 14 a maximum of  two times.  If vibration still exceeds 1.0 ips, replace the fan (Tasks 6-182 and 6-186). NOTE If fan has been replaced, repeat entire vibration analysis. 6-710 Change 1







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