(3) Remove the spinner rear cone (Ref. TASK 72-21-00-000-006).
(4) Record location of each blade to be replaced and of each blade opposite.
(5) Remove fan blades (Ref. TASK 72-21-00-000-007)
(6) Write moment weight on base of blades that you remove using temporary marking (Material No. CP5061). (Ref. Fig. 407/TASK 72-21-00-991-341)
NOTE : Grease deposits can mask the moment weight indication. If
____
R necessary, clean blade base with isopropyl alcohol (Material
R No. CP1041) or acetone (Material No. CP1039) or stoddard
R solvent (Material No. CP2011) or ardrox 552 (Material No.
R CP2559) or turco ind 79 (Material No. CP2560) or mag-chem
R teksol (Material No. CP2566) or degreasol 99 R (Material No.
R CP2584) or mag-chem skysol (Material No. CP2656).
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R R Diagram for Fan Blade Change Figure 406/TASK 72-21-00-991-327
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R R Fan Blade Replacement Figure 407/TASK 72-21-00-991-341
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R R Replacement of Several Pairs of Fan Blades Figure 408/TASK 72-21-00-991-342
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R Fan Blades, Balance Screw Location Chart and Vectorial Diagram R Figure 409/TASK 72-21-00-991-343
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R Various Balance Screw Arrangements for Given Moment Weights R Figure 410/TASK 72-21-00-991-344- 12 (SHEET 1)
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R Various Balance Screw Arrangements for Given Moment Weights R Figure 410/TASK 72-21-00-991-344- 22 (SHEET 2)
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Subtask 72-21-00-420-081
B. Record moment weight on base of spare blades.
CAUTION : FOR EACH PAIR OF FAN BLADES, INSTALL THE HEAVIER SPARE BLADE AT
_______ THE POSITION OF THE HEAVIER BLADE TO BE REMOVED.
R (1) Write the moment weight on base of the spare blades with temporary R marking (Material No. CP5061).
(2) Install spare blades (Ref. TASK 72-21-00-400-007).
Subtask 72-21-00-820-053
C. Determine the balance screws to be installed.
(1) Determine the resultant vector length and direction, then select balance screws to provide a correction returning the fan to its initial balance condition as follows.
NOTE : It is advisable to limit the number of balance screws on the
____ spinner due the complexity and the risk of confusion when performing further corrections, and to install only one set of balance screws. This requires the construction of a vector diagram for determining the sum of the corrections. An example is given in (Ref. TASK 72-21-00-300-009).
(a) Assume the following blades with the moment weights indicated are to be removed: No. 01: 164832 cm.g (64894 in.g) No. 36: 163245 cm.g (64270 in.g) No. 03: 162510 cm.g (63980 in.g) No. 35: 164185 cm.g (64640 in.g)
(b) Assume the moment weights of the opposite blades are as follows: No. 19: 164647 cm.g (64823 in.g) No. 18: 163405 cm.g (64333 in.g) No. 21: 162650 cm.g (64035 in.g) No. 17: 164160 cm.g (64630 in.g)
(c) Calculate differences between moment weights as below: D1: (No. 01/19) = 164832 - 164647 = 185 cm.g (73 in.g) D2: (No. 18/36) = 163405 - 163245 = 160 cm.g (63 in.g) D3: (No. 21/03) = 162650 - 162510 = 140 cm.g (55 in.g) D4: (No. 35/17) = 164185 - 164160 = 025 cm.g (10 in.g)
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R (d) Calculate moment weight differences corresponding to spare fan
R blades as below:
R D'1: (No. 01/19) = 162905 - 162730 = 175 cm.g (69 in.g)
R D'2: (No. 18/36) = 161205 - 161185 = 020 cm.g (08 in.g)
R D'3: (No. 21/03) = 164570 - 164545 = 025 cm.g (10 in.g)
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