(2)
This two-plane balance procedure can also be used to decrease the vibration levels more than the given limts.
B. Equipment
(1) 856A3578G01 Tool Set - LPT Balance Clips
Installation/Removal
CFM International, P.O. Box 15524,
Cincinnati, OH 45314
C. References
(1) AMM 71-00-00/201, Power Plant
D. Access
(1) Location Zones
506 No. 1 Engine
606 No. 2 Engine
E. Trim Balance the Engine (Two-Plane Method)
EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 825-035-C00
CAUTION: DO NOT TRY TO BALANCE THE LPT IF THE FAN WAS NOT BALANCED TO
_______ APPROXIMATELY 1.0 MILS. WHEN YOU BALANCE THE LPT, THE FAN VIBRATION LEVELS WILL NOT BE DECREASED.
(1) If the last result of a fan trim balance procedure is not satisfactory, you must balance the fan again to give the lowest vibration level on No. 1 bearing (or FFCCV) sensor.
NOTE: The vibration level on No. 1 bearing (or FFCCV) sensor
____
becomes the new baseline.
S 975-037-C00
(2) Do the steps that follow to calculate the balance weights.
(a) Write the data that follows on a new worksheet (Fig. 511).
1) Write the sensitivity and phase lag values for the No. 1
_____ bearing only (or FFCCV) that were calclulated during the
____________
intervectorial analysis procedure (three sets).
NOTE: If the intervectorial procedure was not done, use
____ the applicable sensitivity and phase lag values that you got during the vector analysis procedure.
2) Write the values of vibration amplitudes (UO) and phase angles (AO) for the No. 1 bearing only (or FFCCV) that you
__________________ got during the initial engine run of the one-shot plot procedure.
NOTE: Use the values that are related to the same N1
____ speeds as the values that you claculated during the intervectorial (or vector) analysis procedure.
S 965-038-C00
(3) Replace the weights you installed before the last engine run with the screws you wrote on Fig. 502.
NOTE: The torque value for the balancing screws is
____
70-75 pound-inches (8.0-8.5 Newton meters).
S 975-039-C00
(4) Use the data you wrote (on Fig. 511), calculate the imbalance weight W5 at angle A5 with the one-shot plot procedure.
NOTE: The procedure is done with only three data points.
____
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
S 975-078-C00
CAUTION: IF THE FAN HAS NOT BEEN BALANCED APPROXIMATELY 1.0 MILS, DO NOT
_______ TRY THE LPT BALANCING PROCEDURE, BECAUSE THE TRF SENSOR IS MORE SENSITIVE TO LPT IMBALANCE THAN THE NO. 1 BEARING SENSOR.
CAUTION: DO NOT OPERATE THE ENGINE AT SPEEDS THAT CAUSE A VIBRATION
_______ LEVEL ON THE TRF SENSOR THAT IS MORE THAN 8 MILS. IF YOU OPERATE THE ENGINE AT VIBRATION LEVELS THAT ARE MORE THAN 8 MILS, YOU CAN CAUSE ENGINE PERFORMANCE DETERIORIZATION.
(5) With the one-shot procedure, do the steps that follow.
(a)
Calculate new balance screws.
(b)
Install the new balance screws.
NOTE: The torque value for the balancing screws is
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