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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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