DOC AIRBUS | AMM A320FAngular Distribution for a Replacement of 3 to 18 Pairs of fan Rotor Blades Manual Method [CFMB]
TASK 72-21-00-300-025-A
Angular Distribution for a Replacement of 3 to 18 Pairs of fan Rotor Blades Manual Method
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 72-21-00-941-077-A ** ON A/C NOT FOR ALL
Subtask 72-21-00-350-051-A ** ON A/C NOT FOR ALL
Subtask 72-21-00-869-072-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 02:41:23 UTC
Angular Distribution for a Replacement of 3 to 18 Pairs of fan Rotor Blades Manual Method
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
Angular Distribution and Installation of Blades on Fan DiskSubtask 72-21-00-941-077-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(4) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
4. Procedure(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
(4) Put an ACCESS PLATFORM 1M (3 FT)-ADJUSTABLE in position.
Subtask 72-21-00-350-051-A ** ON A/C NOT FOR ALL
A. Manual Distribution Method.
(1) Put the blades in decreasing order of moment weights. The moment weight of each blade is marked under the blade root.
(2) Temporarily give numbers to the blades from 1 to 36, blade No. 1 is the haviest, blade No. 36 is the lightest.
(3) Make the angular distribution of blades as shown in table of referenced figure.
(4) Calculate the resulting (static) moment of the imbalance of the blades.
(5) Decrease the calculated resultant to the lowest possible amount. To do this, change the location of the blades as necessary.
5. Close-up(1) Put the blades in decreasing order of moment weights. The moment weight of each blade is marked under the blade root.
(2) Temporarily give numbers to the blades from 1 to 36, blade No. 1 is the haviest, blade No. 36 is the lightest.
(3) Make the angular distribution of blades as shown in table of referenced figure.
(4) Calculate the resulting (static) moment of the imbalance of the blades.
(5) Decrease the calculated resultant to the lowest possible amount. To do this, change the location of the blades as necessary.
NOTE: The moment weight difference between 2 blades 180-degree apart must be kept within 200 g.cm. The resultant moment of imbalance must be less than 80 g.cm.
Subtask 72-21-00-869-072-A ** ON A/C NOT FOR ALL
A. Make sure that the work area is clean and clear of tools and other items.
Subtask 72-21-00-942-071-A ** ON A/C NOT FOR ALL B. Close Access
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).
(1) Remove the access platform(s).
(2) Remove the WARNING NOTICE(S).