*
PERFORM BALANCE or CALCULATE SPECIFIC BALANCE COEFFICIENTS/GROUND RUN
*
CONTINUE.
Perform Balance
The PERFORM BALANCE selection of the EBS calculates a balance solution that corrects high engine vibration. The solution identifies the balance weights that you should remove and install in the aft spinner or on the LPT blades.
Calculate Specific Balance Coefficients/Ground Run
The CALCULATE SPECIFIC BALANCE COEFFICIENTS/ GROUND RUN selection of the EBS lets you do these functions:
*
Calculate new specific balance coefficients
*
Record ground run data for the EBS to use.
When you calculate specific balance coefficients, the EBS replaces the existing balance coefficients. The AVM signal conditioner unit can use ground run data, or both flight data and ground run data, to calculate the new coefficients.
Continue
When you select CONTINUE, the MAT shows the EXISTING BALANCE WEIGHTS display. The CONTINUE selection becomes active after you make the first two selections.
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ENGINE INDICATING -AVM -ENGINE BALANCING SYSTEM (EBS)
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PW4000 SERIES ENGINES
777 AIRCRAFT MAINTENANCE MANUAL
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ENGINE INDICATING -AVM -EBS -PERFORM BALANCE -1
Existing Balance Weights Display
The EXISTING BALANCE WEIGHTS display shows the part number and location of the fan and LPT balance weights. The data is in the AVM signal conditioner unit memory.
You use this data to make sure the balance weight data in the AVM signal conditioner unit memory matches the weights on the engine. This is necessary for the AVM signal conditioner unit to calculate a correct balance solution. If the balance weight data is not correct, you must change the data. When you select the data or a blank text field, an edit dialog box shows.
On the EXISTING BALANCE WEIGHTS display, you can make these two selections:
*
CONTINUE
*
FLIGHT HISTORY.
When you select CONTINUE, the AVM signal conditioner unit calculates a balance solution and the MAT shows the SOLUTION SUMMARY display.
When you select FLIGHT HISTORY, the MAT shows the N1 VIBRATION FLIGHT HISTORY display.
N1 Vibration Flight History Display
The N1 VIBRATION FLIGHT HISTORY display shows the fan (Front) and LPT (Rear) vibration data and phase angle for six flight legs. The data shows for different N1 speeds. Vibration data shows in reverse video format (black numbers on a white background) when the vibration level is more than the recommended vibration guideline.
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