R R Diagram for Fan Blade Change in Individual Figure 412/TASK 72-21-00-991-346
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R C. Calculate difference between moment weights of both blades.
R (1) If difference between moment weights "D" is within 200-800 cm.g
R (80-315 in.g), correct the imbalance as in the example which follows:
R NOTE : If you change only one fan blade and if the moment weight with
____ R the opposite blade is less than 200 cm.g (80 in.g), no R correction is necessary.
R NOTE : If you change more than one fan blade, a vectoriel diagram
____ R must be done in order to identify the resultant imbalance. R Apply the procedure as shown in the following example.
R (2) Assume a blade with moment weight of 162750 cm.g (64075 in.g) is to R be replaced in any position.
R (3) A spare blade is provided with moment weight of 163296 cm.g (64290 R in.g).
R (4) Calculate the difference between the moment weights as below: R 163296 - 162750 = 546 cm.g (215 in.g).
R (5) Select balance screws as follows:
R (a) To determine the solutions closest to above difference of 546 R cm.g (215 in.g). One centered screw P05 and 2 lateral screws P01 R = 541 cm.g (213 in.g). This solution permits a satisfactory R correction for returning the fan close to its initial balance R condition. R (Ref. Fig. 410/TASK 72-21-00-991-344)
R (6) Locate balance screws as follows:
R (a) As the new blade is heavier than the removed blade, install R balance screws close to the opposite blade.
R NOTE : If the new blade is lighter than the removed blade,
____ R install balance screw close to the removed blade.
R (7) Install balance screws lightly coated with graphite grease (Material R No. CP2101). TORQUE screws to between 65 and 75 lbf.in (0.73 and 0.84 R m.daN).
R NOTE : Balance screws are identified by a number corresponding to
____ R their moment weight (P01-P02-P03-P04-P05-P06-P07) engraved on
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E E R screw head. As it may be difficult to read the numbers due to R erosion and pollution, the relationship between the screw R reference and screw length is shown in. R (Ref. Fig. 411/TASK 72-21-00-991-345)
R (8) Do a vibration-check and if the vibration level is out of the limits,
R do a trim balance.
R (Ref. Fig. 412/TASK 72-21-00-991-346)
R (9) Install the spinner rear cone (Ref. TASK 72-21-00-400-005).
R (10) Install the spinner front cone (Ref. TASK 72-21-00-400-006).
R (11) Remove the rubber mat from the inlet cowl. weights is within 400 and
R 800 cm.g).
R 5. Close-up
________ R Subtask 72-21-00-869-081 R A. Make sure that the work area is clean and clear of tool(s) and other
R items.
R Subtask 72-21-00-942-079
R B. Close Access
R (1) Remove the access platform(s).
R (2) Remove the warning notice(s).
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TASK 72-21-00-920-001
R Discard Fan Disc and Booster Spool
1. Reason for the Job
__________________
Refer to the MPD TASK: 722100-C1
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-00-00-000-042 Removal of the Power Plant
71-00-00-400-042 Installation of the Power Plant
ESM 72-21-00
3. Job Set-up
__________
Subtask 72-21-00-010-062
A. Remove the engine (Ref. TASK 71-00-00-000-042).
4. Procedure
_________
Subtask 72-21-00-020-077
A. Remove and discard fan disk and booster spool (Ref. ESM 72-21-00).
Subtask 72-21-00-420-083
B. Install new fan disc and booster spool (Ref. ESM 72-21-00).
5. Close-up
________
Subtask 72-21-00-410-064
