TASK 72-31-02-408-007-G00
3. Replace and Balance a Fan Rotor Blade Set
(Figure 803, Figure 804, Figure 805)
A. References
Reference Title
71-00-00 P/B 501 POWER PLANT - ADJUSTMENT/TEST
72-31-02 P/B 401 FAN ROTOR BLADES - REMOVAL/INSTALLATION
B. Location Zones
Zone Area
412 Left Powerplant Nose Cowl
422 Right Powerplant Nose Cowl
C. Procedure
SUBTASK 72-31-02-028-008-G00
(1) Remove the fan rotor blades (PAGEBLOCK 72-31-02/401).
(a) Make sure each blade has an identification mark that shows the blade position number.
SUBTASK 72-31-02-978-009-G00
(2) Use the Blade Plot Form (Figure 804) to make a record of the moment weight and class code
for each blade.
NOTE: The moment weight is identified on the bottom of the blade dovetail. If you cannot read
the moment weight, use the class code. It is on the top forward surface of the blade
platform. The Moment Weight Table (Figure 803) identifies the class code number for
each moment weight.
(a) Put the blades in a sequence with the heaviest blade first and the lightest blade last.
SUBTASK 72-31-02-948-010-G00
(3) Put the replacement set blades in the same sequence as the initial blades.
(a) Each replacement blace should be adjacent to an initial blade.
NOTE: The heaviest initial blade will be adjacent to the heaviest replacement blade.
SUBTASK 72-31-02-938-011-G00
(4) Use a felt tip pen to put position identification marks on each blade of the replacement set.
(a) Each replacement blade will be identified with the same position number as the adjacent
initial blade.
SUBTASK 72-31-02-978-012-G00
(5) Use the Blade Plot Form (Figure 804) to make a record of the moment weight and class code
of each replacement blade.
SUBTASK 72-31-02-978-013-G00
(6) Do the steps that follow to compare the total moment weights for opposite quadrants
(Figure 804 and Figure 805):
(a) For the initial and the replacement blades, add the moment weights in each quadrant
(Figure 804).
1) Make a record of the total moment weight in each quadrant (Figure 804).
(b) Make a record of the total moment weight of each quadrant in the Balance Comparison
Form (Figure 805).
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-31-02
NoC
Page 806
D633T1B7 Dec 22/2016
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details
EFFECTIVITY
ABX 001-007, 011, 012, 016-019, 021, 022, 025, 101,
109, 114, 115, 314-999
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