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A low power engine check run is recommended
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A high power engine check run is recommended
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No solution is available
After you select ONE PLANE or TWO PLANE, you must select CONTINUE or SOLUTION PREDICTION.
EFFECTIVITY
BEJ ALL
When you select CONTINUE, the MAT shows the NEW BALANCE WEIGHTS display.
When you select SOLUTION PREDICTION, the MAT shows the N1 VIBRATION PREDICTION display.
N1 Vibration Prediction Display
The N1 VIBRATION PREDICTION display shows the front and rear vibration at different N1 speeds. It shows the actual and the predicted vibration levels.
The actual vibration comes from the leg average or the specific flight leg you selected on the N1 VIBRATION FLIGHT HISTORY display.
The predicted vibration shows what the vibration will be if you make the balance solution weight changes.
You select GO BACK to return to the SOLUTION SUMMARY display.
Training Information Point
The N1 VIBRATION PREDICTION 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.
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The N1 VIBRATION PREDICTION display shows predicted vibration that is higher than the recommended vibration guideline in reverse video format (black letters on a white background). The display does not show actual vibration in reverse video format.
EFFECTIVITY BEJ ALL 77-31-00
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EFFECTIVITY BEJ ALL 77-31-00
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New Balance Weights Display
The NEW BALANCE WEIGHTS display shows the part number and location of the new FAN and LPT balance weights. This is what the balance weight configuration will be after you change the weights.
When you select KEEP WEIGHTS, the MAT shows the ENGINE BALANCING EXIT APPROVAL display.
Engine Balancing Exit Approval
The EXIT APPROVAL display permits the approval of the balance weights shown on the NEW BALANCE WEIGHTS display.
When you select KEEP WEIGHTS on the EXIT APPROVAL display the new balance weight data goes into the AVM SCU memory. After you select KEEP WEIGHTS, the EXIT APPROVAL display goes out of view and you go back to the NEW BALANCE WEIGHTS display.
If you select GO BACK on the EXIT APPROVAL display, you return to the NEW BALANCE WEIGHTS display. You select GO BACK to look at any of the data again or to reject the new weights.
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