(b)  
Install the three lubricated P05 balance screws at the first
 location that you found.

 (c)  
Remove the protective mats and all other remaining unwanted
 material from the inlet cowl.

 S 715-065-C00
 (11) Obey the related WARNING AND CAUTION while you do an engine run.
 (a)  Write the U1 values.
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S 965-066-C00
 (12)
 Obey the related CAUTION while you replace the three P05 weights with initial lubricated P07 screws.

 S 035-067-C00

 (13)
 Obey the related CAUTION while you install the three lubricated P05 balance screws in the second location that you found (120°).

 S 715-068-C00

 (14)
 Obey the related WARNING and CAUTION while you do a second engine run.

 (a)  Write the U2 values.
 S 965-069-C00
 (15)
 Obey the related CAUTION while you replace the three P05 weights from the second location with the initial (lubricated) P07 screws.

 S 035-070-C00

 (16)
 Obey the related CAUTION while you install the three (lubricated) P05 balance screws in the third location that you found (240°).

 S 715-071-C00

 (17)
 Obey the related WARNING and CAUTION while you do a third engine run.

 (a)  Write the U3 values.
 S 975-072-C00
 (18) Use the 3-shot procedure to Calculate the balance weight, W7, and its location as follows.
 (a)  
To calculate the results more easily, use only the three highest indications (U0) for the No. 1 bearing (or FFCCV) and the three highest indications for the TRF from the initial engine run.

 (b)  
Use the letters A thru F as indices for the six points you will use.

 NOTE: For an example, the first point P1, will be referred to
____
 as A, the second point P2, as B.

 (c)  
Write the related initial imbalances U0 on the worksheet
 (Fig. 527).

 (d)  
Make a selection of applicable graduations, in g-cm, on a polar graph (Fig. 505) such that the initial selection of points will be located at 1/2 of the graph.

 (e)  
For each speed selection and each sensor find the balance weight sensitivity as follows. 1) Draw a circle, with the center at the origin, with a radius

 that is related to the initial imbalance (U0) before you added other weights (Fig. 528).
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////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
DATA POINT
A B D E FC
INDEX
INITIAL
IMBALANCE
UO
MILS D.A.

RESULTANT
R
MILS D.A.

ANGLE
X
DEGREES

BALANCE WEIGHT W6= UO
1040 x
R1
G-CM

SENSITIVITY 1040
S = R1
S-M56-MM-1947-(1)-03-C
3-Shot Plot Analysis Worksheet
Figure 527

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 ú  Mar 15/94 

BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
MACHINED MARK/INDEX FOR THE NO. 1 FAN BLADE
　
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