(3) Install the spinner rear cone. (Ref. TASK 72-21-00-400-006)
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5. Close-up
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Subtask 72-21-00-942-065
A. Close Access
(1) Remove the access platform(s).
(2) Remove the warning notice(s). R
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TASK 72-21-00-300-009
Correction of the Static Imbalance
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
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REFERENCE QTY DESIGNATION
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No specific warning notice
No specific access platform 0.5 m (1 ft. 8 in.)
B. Referenced Information
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REFERENCE DESIGNATION
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71-00-00-710-009 Vibration Check
71-00-00-750-001 Fan Trim Balance - 1 sensor 3 speed R 72-21-00-991-324 Fig. 801 R 72-21-00-991-328 Fig. 802 R
3. Job Set-up
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Subtask 72-21-00-941-074
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
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(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a warning notice to tell persons not to energize the FADEC 1(2). 1(2).
(4) Put an access platform in position.
4. Procedure
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R (Ref. Fig. 801/TASK 72-21-00-991-324, 802/TASK 72-21-00-991-328)
Subtask 72-21-00-750-053
A. Example of static imbalance correction on a spinner still equipped with
balance screws other than P07. R (Ref. Fig. 802/TASK 72-21-00-991-328)
(1) Assume a balance weight Fc = 480 cm.g (189 in.g) orientated toward balance screw No. 24, is to be installed on the spinner which is still equipped with balance screws P02 in screw positions No. 18 and 19, and P05 in screw position No. 22.
(2) Both screws P02 have a total moment weight F1 of 327 cm.g (129 in.g) acting along an axis between both screws.
(3) Screw P05, installed in position No. 22, has a moment weight F2 of 375 cm.g (148 in.g) acting along an axis going through the screw location.
(4) Vectorial sum corresponding to the 3 balance screws has a resultant F3 of approximately 656 cm.g (258 in.g).
(5) Fc and F3 have a vectorial sum Ft of 1072 cm.g (422 in.g) acting along an axis close to balance screw No. 22.
(6) Shows that 1 centered screw P04 and 2 lateral screws P05 provide a
total moment weight of 1048 cm.g (413 in.g). R (Ref. Fig. 801/TASK 72-21-00-991-324)
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Various Balance Screw Arrangements For Given Moment Weights R Figure 801/TASK 72-21-00-991-324- 12 (SHEET 1)
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Various Balance Screw Arrangements For Given Moment Weights R Figure 801/TASK 72-21-00-991-324- 22 (SHEET 2)
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R Static Imbalance Correction Figure 802/TASK 72-21-00-991-328
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(7) One balance screw P04 must be installed in position 22 and 2 lateral screws P04 must be installed in position 21 and 23, instead of screws previously installed.
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