Weight Configuration (Menu Mode) [CFML]

TASK 73-29-00-710-804-A
Weight Configuration (Menu Mode)

ZONE: 400

1. Reason for the Job
The weight configuration and entry functions in the menu mode provides the operator with the existing fan balance trim weight configuration and allows the operator to change the weight configuration stored in the EEC NVM. The weight configuration entry only needs to be performed on one EEC channel. The configuration will automatically be saved to the other EEC channel. The trim weights are used for engine balancing to reduce flight deck indicated engine vibration, airplane cabin noise and vibration due to the fan rotor unbalance.

NOTE: Refer to Task 71-00-00-750-804 Fan Trim Balance for information.

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-41-00-861-002-A	Energize the Aircraft Electrical Circuits from the External Power
TASK 24-41-00-861-002-A-01	Energize the Aircraft Electrical Circuits from the APU
TASK 24-41-00-861-002-A-02	Energize the Aircraft Electrical Circuits from Engine 1(2)
TASK 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
TASK 31-32-00-860-012-A	Procedure to Get Access to the SYSTEM REPORT/TEST/ENG Page
TASK 71-13-00-010-803-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A	Closing of the Fan Cowl Doors
TASK 78-30-00-040-809-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A	Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A	Closing of the Thrust Reverser Cowl Doors
Special Functions Menu
Engine Balancing Submenu
Existing Balance Weights
Edit Balance Weights
Update Balance Weights
Balance Weights Invalid Entry Error
Confirm Balance Weights
Balance Weights Saved
Balance Weights NVM Error

3. Job Set-up
Subtask 73-29-00-861-071-A

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).

Subtask 73-29-00-941-067-A

B. Safety Precautions
(1) On the center pedestal, on ENG panel 115VU:
(a) Make sure that the ENG/MODE selector switch is in the NORM position.
(b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
(c) Put WARNING NOTICE(S) in position to tell persons not to operate:

The ENG/MODE selector switch, and
The ENG/MASTER 1(2) control switch.

(2) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).

Subtask 73-29-00-010-066-A

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 73-29-00-040-058-A

D. Deactivation of the Thrust Reverser System for Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).

Subtask 73-29-00-010-067-A

E. Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
(1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 73-29-00-865-084-A

F. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
49VU	L/G/LGCIU/SYS1/NORM	1GA	C09
121VU	HYDRAULIC/LGCIU/SYS2	2GA	Q35
121VU	HYDRAULIC/LGCIU/SYS1/GRND SPLY	52GA	Q34
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
49VU	ENGINE/1/FADEC A/AND EIU 1	2KS1	A04
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
121VU	ENGINE/ENG1/FADEC B/AND EIU 1	4KS1	R40
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
49VU	ENGINE/2/FADEC A/AND EIU 2	2KS2	A05
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42
121VU	ENGINE/ENG2/FADEC B/AND EIU2	4KS2	R41

Subtask 73-29-00-860-098-A

G. Aircraft Maintenance Configuration
(1) On the ENG section of maintenance panel 50VU:

Release the FADEC GND PWR 1(2) pushbutton switch (the ON legend comes on).

(2) After the FADEC is energized, wait ten seconds before you start the test. If you do not wait ten seconds, the interactive mode stops the EEC self-test and this can cause unwanted faults.
(3) On the left or right Multipurpose Control and Display Unit (MCDU), get the SYSTEM REPORT/TEST/ENG page (Ref. AMM TASK 31-32-00-860-012).

4. Procedure
Subtask 73-29-00-710-073-A

CAUTION: THIS SCREEN SHOWS WHAT WAS PREVIOUSLY RECORDED IN THE EEC NVM. IT IS POSSIBLE THAT IT DOES NOT REFLECT WHAT IS CURRENTLY INSTALLED ON THE ENGINE. DO A CHECK OF YOUR RECORDS, OR, IF YOU ARE NOT SURE, REMOVE THE FAN SPINNER TO CONFIRM THE ACTUAL WEIGHT CONFIGURATION.

A. Existing Fan Weights

The purpose of the EXISTING FAN WEIGHTS screen is to inform the operator of the current fan weight configuration status.

NOTE: After selecting an MCDU button, it may take approximately 10 seconds to transition to the next Menu Mode screen.

NOTE: The fan weight editing menu mode function takes approximately 10 minutes to complete.

NOTE: The EEC will not enter the menu mode (interactive mode) after an enquire command from the CFDS (Centralized Fault Display System) when any of the following conditions are set:

N2 more than ten percent or invalid
Rotary selector is set on: CRANK or IGN/START or invalid
Manual Start Button set on: ON or invalid
TLA (Throttle Lever Angle) not at idle or invalid
Aircraft in the air
MASTER lever ON or invalid
BITE command code input label invalid
Landing gear is simulated in flight configuration.

NOTE: The EEC will abort a running test or special function when any of the following conditions becomes set:

N2 more than ten percent or invalid
Engine state not off
Engine not in default start state
TLA (Throttle Lever Angle) not at idle or invalid
Aircraft in the air
MASTER lever ON or invalid
You enter in the interactive mode of the other channel.

ACTION	RESULT
1.On the Menu Mode main menu, select the key adjacent to SPECIAL FUNCTIONS (2R).	The SPECIAL FUNCTIONS menu is displayed (Screen 1).
2.On the SPECIAL FUNCTIONS menu, select the key adjacent to ENGINE BALANCING (1R)	The ENGINE BALANCING submenu is displayed (Screen 2).
3.Select the BALANCE ENGINE function (2R).	The EXISTING BALANCE WEIGHTS page is displayed (Screen 3). The existing fan trim balance weights and locations are displayed in two columns. The part number (PN column) is associated with the mass of the balance weight. Part numbers range from 02 thru 03. The bolt hole (BH column) is the location of the fan trim balance mass. Bolt hole locations range from 01 to 72. Empty bolt hole locations are marked by "--" for both columns.
4.Review the existing fan trim balance weights and locations. To return to the ENGINE BALANCING submenu, select the key adjacent to RETURN (6L). To edit fan trim weights, select key adjacent to EDIT WEIGHTS (5L).See Para. B. Edit Fan Balance Weights for additional information.

Subtask 73-29-00-710-074-A

B. Edit Fan Balance Weights
The purpose of the edit fan balance weights function is to permit the user to make changes to the fan trim weight entry configuration stored in the EEC. A fan trim mass (PN 02 or 03, 01 is no weight) is permitted on up to 36 fan trim balance weight locations (BH 01 thru 72). The stored fan balance weights and locations can be used to compute fan trim balance solutions which reduce flight deck indicated engine vibration, airplane cabin noise and vibration due to the fan rotor unbalance.

NOTE: PN 01 = Empty hole, PN 02 = Screw and nut configuration, PN 03 = Screw, nut, and weight configuration.

NOTE: After selecting a MCDU button, it may take approximately 10 seconds to transition to the next Menu Mode screen.

NOTE: The fan weight editing menu mode function takes approximately 10 minutes to complete.

ACTION	RESULT
1.On the Menu Mode main menu, select the key adjacent to SPECIAL FUNCTIONS (2R).	The SPECIAL FUNCTIONS menu is displayed (Screen 1).
2.On the SPECIAL FUNCTIONS menu, select the key adjacent to ENGINE BALANCING (1R).	The ENGINE BALANCING submenu is displayed (Screen 2).
CAUTION: THIS SCREEN SHOWS WHAT WAS PREVIOUSLY RECORDED IN THE EEC NVM. IT IS POSSIBLE THAT IT DOES NOT REFLECT WHAT IS CURRENTLY INSTALLED ON THE ENGINE. DO A CHECK OF YOUR RECORDS, OR, IF YOU ARE NOT SURE, REMOVE THE FAN SPINNER TO CONFIRM THE ACTUAL WEIGHT CONFIGURATION. 3.Select the WEIGHTS CONFIG function (1R).	The EXISTING BALANCE WEIGHTS page is displayed (Screen 3).
4.Review the existing fan trim balance weights and locations. To edit fan trim weights, select the key adjacent to EDIT WEIGHTS (5L) to enter the new fan trim weights.	The Edit Balance Weights screen is displayed (Screen 4).
5.Select the arrow key associated with the fan trim weight bolt hole (BH) and part number (PN) to be modified (2L, 2R, 3L, 3R, 4L or 4R). NOTE: Multiple pages may be displayed depending on the number of weights installed.	The Update BALANCE WEIGHTS screen is displayed (Screen 5).
6.If you are installing a new weight or modifying an existing weight and location, use the MCDU number pad to enter the 2 digit code for both the bolt hole location and weight part number. Bolt hole location is the first two digits. Part number is the second two digits. Select the key adjacent to UPDATE (5R) to enter the new configuration. If you are removing a weight, select the key adjacent to REMOVE (5L).	If the weight configuration was updated or removed successfully, the Edit BALANCE WEIGHTS screen is displayed (Screen 4). If the weight configuration entered was a duplicate entry or an invalid combination, the Balance Weights Invalid Entry Error screen is displayed (Screen 6).
7.Repeat steps 5 and 6 until all installed fan trim balance weights and locations for the desired configuration appear on the Edit BALANCE WEIGHTS screen(s). Select key 5R to confirm the weight entry.	The Confirm Balance Weights screen is displayed (Screen 7).
CAUTION: YOU MUST NOT INSTALL FAN TRIM WEIGHTS THAT DO NOT MATCH WITH THE WEIGHTS SAVED IN THE EEC MEMORY. IF YOU DO NOT OBEY THIS INSTRUCTION, THE FUTURE FAN TRIM BALANCE CALCULATIONS WILL NOT BE CORRECT AND CAN CAUSE A FAN UNBALANCE. 8.Remove the currently installed weights and apply the weights displayed on the Confirm BALANCE WEIGHTS screen. Verify the installed fan trim weights match configuration displayed on the screen. Once the weights have been verified, select the key adjacent to SAVE WEIGHTS (5R) to store the weights and locations to EEC memory.	If the weight configuration is stored successfully, the Balance Weights Saved screen is displayed (Screen 8). If the EEC was not able to store the weight configuration to NVM, the Balance Weights NVM Error screen is displayed (Screen 9). Verify no EEC NVM, electrical power, or cross-channel faults are present prior to reattempting to modify fan trim weights.
9.Select the key adjacent to RETURN (6L) to return to the Engine Balancing submenu.

5. Close-up
Subtask 73-29-00-860-099-A

A. Put the aircraft back to its initial configuration.
(1) On the overhead maintenance panel 50VU:

Push the ENG/FADEC GND PWR 1(2) pushbutton switch. The ON legend goes off.

Subtask 73-29-00-862-071-A

B. De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 73-29-00-410-069-A

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-410-806):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR

Subtask 73-29-00-440-057-A

D. Do the reactivation of the thrust reverser after maintenance (Ref. AMM TASK 78-30-00-440-809).

Subtask 73-29-00-410-070-A

E. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-803):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR
(2) Remove the access platform(s).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:57:52 UTC