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You select AVERAGE to cause the AVM signal conditioner unit to use that data to calculate a solution for engine balancing. You may also select a specific flight leg to cause the AVM signal conditioner unit to use that data.
You select GO BACK to go back to the EXISTING BALANCE WEIGHTS display.
You select N2 FLIGHT HISTORY to show the N2 VIBRATION FLIGHT HISTORY display (not shown). The N2 VIBRATION FLIGHT HISTORY display shows the N2 rotor vibration data for six flight legs. You use the N2 vibration data to make sure N2 vibration is less than the recommended vibration guideline. You cannot balance the N2 rotor with the EBS.
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ENGINE INDICATING -AVM -EBS -PERFORM BALANCE -1

Training Information Point
When the AVM signal conditioner unit calculates the leg average it uses only the legs or ground runs with the same weight configuration as the present leg (LG 0). When you do a PERFORM BALANCE, the EBS will not let you select legs with weights that are different from the present leg (LG 0).
Some legs may not have data for one or more engine speeds. This occurs if the engine does not operate at that speed for 30 seconds or more. The AVM signal conditioner unit must have vibration data for a minimum of four speeds to calculate the balance solution.
The N1 VIBRATION FLIGHT HISTORY display shows N1 vibration data in mils S.A. (single amplitude). These are different than the scalar units for N1 vibration on the secondary engine display and the performance maintenance page.
The N2 VIBRATION FLIGHT HISTORY display shows N2 vibration data in scalar units.
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ENGINE INDICATING -AVM -EBS -PERFORM BALANCE -1

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PW4000 SERIES ENGINES

777 AIRCRAFT MAINTENANCE MANUAL

THIS PAGE IS INTENTIONALLY LEFT BLANK

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ENGINE INDICATING -AVM -EBS -PERFORM BALANCE -2

Solution Summary Display
The SOLUTION SUMMARY display lets you select a one-plane or two-plane solution.
When you select ONE PLANE, the AVM signal conditioner unit finds the weights you must change in the front balance plane (FAN) to correct high N1 vibration. The SOLUTION SUMMARY display shows the part numbers and locations of the fan balance weights you must remove and install. The display also shows the predicted overall vibration reduction.
When you select TWO PLANE, the AVM signal conditioner unit finds the weights you must change in the front and rear balance planes (FAN and LPT) to correct high N1 vibration. In this case the SOLUTION SUMMARY display also shows the part numbers and locations of the LPT weights you must remove and install.
　
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