Select HELP to show the help dialog box for the central maintenance options dialog box. Help text for the dialog box must be in the CMCF AMI for HELP to show.
Select REPORT DATA to show the report dialog box.

Select GO BACK to remove the dialog box and return to the previous display.
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777 AIRCRAFT MAINTENANCE MANUAL

CMCS -CMCF OPTIONS DIALOG BOX

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CMCS -ENGINE BALANCING SYSTEM MAIN MENU DIALOG BOX

General

The CMCF, with the left and right airborne vibration monitor unit (AVMU), supplies an onboard engine balancing system (OEBS). The AVMUs supply the data for the OEBS displays that show on the MAT.
The OEBS MAIN MENU dialog box shows:
*
Two groups of two exclusive selections

*
Buttons.

The first group of exclusive selections shows:
*
ENGINE 1

*
ENGINE 2.

The second group of exclusive selections shows these:

*
PERFORM BALANCE

*
CALCULATE SPECIFIC BALANCE COEFFICIENTS/GROUND RUN.

Buttons

Select CONTINUE after you select PERFORM BALANCE (either engine) to show the engine balancing/perform balance/existing balance weights display.
Select CONTINUE after you select calculate specific balance coefficients/ground run and either engine to show the engine balancing/calculate coefficients/n1 vibration flight history display.
Select HELP to show the help dialog box for the OEBS main menu dialog box. Help text for the dialog box must be in the CMCF AMI for HELP to show.
Select GO BACK to remove the OEBS main menu dialog box.

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CMCS -ENGINE BALANCING SYSTEM MAIN MENU DIALOG BOX

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CMCS -ENGINE BALANCING/PERFORM BALANCE/EXISTING BALANCE WEIGHTS DISPLAY

General

The engine balancing/perform balance/existing balance weights display shows fan and low pressure turbine (LPT) balance weights information. Use the display to change this information.
This display shows this information:
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Display title

*
Configuration text fields

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Dialog text field

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fan text entry field

*
LPT text entry field

*
Buttons.

Selection of any data or blank text field in the fan text entry field or the LPT text entry field causes the engine balancing/edit weight data dialog box to show.
The existing balance weights data is a list of up to 15 weight part numbers and weight location numbers for the fan, and 15 weight part numbers and weight location numbers for the LPT, that are currently on the engine.
Buttons

Select CONTINUE to send the fan and LPT changes to the selected AVM. The engine balancing/calculation condition dialog box shows next.
Select FLIGHT HISTORY to do these functions:
*
Request the data for both the perform balance N1 and the perform balance N2 vibration flight history displays from the selected AVMU.

*
Show the engine balancing/perform balance/N1 vibration flight history display.

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CMCS -ENGINE BALANCING/PERFORM BALANCE/EXISTING BALANCE WEIGHTS DISPLAY

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CMCS -ENGINE BALANCING/EDIT WEIGHT DATA DIALOG BOX

General

Change the fan and LPT weights part numbers on the engine balancing/edit weight data dialog box. Also change the hole number where the weights are on the fan and the blade number where the weights are on the LPT on the engine balancing/edit weight data dialog box.
The engine balancing/edit weight data dialog box shows:
*
Fan weight part numbers

*
LPT weight part numbers

*
Fan hole numbers

*
LPT blade numbers

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Three exclusive selections

*
Command selections.

The part number and hole/blade number text box entry fields get data from the existing balance weights displays and the keep balance weights displays.
Buttons

Select one of the three exclusive selections then select CONTINUE.
*
With the add new part and hole/blade Numbers exclusive selection selected, the data in the text box entry field adds to the LPT or fan text entry field on the existing balance weights display or the keep balance weights display
　
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