(f) If the repaired blade is heavier than the initial blade, the balance weight will be installed
on the opposite blade.
SUBTASK 72-31-02-424-016-G00
(4) Do the steps to install the fan rotor blade for the repaired blade and the opposite blade (if it is
necessary).
I. Measure the clearance between the end of the blade and the shroud.
(Figure 402)
NOTE: If you installed less than ten blades, this step is not necessary.
SUBTASK 72-31-02-400-001-G00
CAUTION
DO NOT DO THIS PROCEDURE UNTIL YOU DO A CHECK OF THE FAN
ROTOR BLADES, RETAINERS, SPACERS AND KEYS. IF THE BLADES DO
NOT INSTALL CORRECTLY, YOU WILL GET INCORRECT CLEARANCE
RESULTS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(1) Make sure that all the fan rotor blades, retainers, spacers and keys are installed correctly.
SUBTASK 72-31-02-934-032-G00
(2) Use the marker, STD-7049 to make an identification mark on the axial reference line (at the 6
o'clock position) on the shroud.
SUBTASK 72-31-02-934-019-G00
(3) Do the steps that follow to identify E12 and E13:
(a) Make a mark 7.8 inches (198mm) aft of the forward flange at the 6 o'clock position on the
fan case (this is E12).
(b) Make a mark 10.6 inches (269mm) aft of the forward flange on the fan case (this is E13).
(c) Make two lines on the circumference of the shroud to show the E12 and E13 locations.
SUBTASK 72-31-02-214-020-G00
(4) Make sure all the blades have position identification numbers.
SUBTASK 72-31-02-984-021-G00
(5) Do the steps that follow to make sure the blade is engaged in the disk slot:
(a) Hold the blade outboard of the midspan shroud.
(b) Try to move the blade in the forward and aft direction.
SUBTASK 72-31-02-224-022-G00
(6) At the 6 o'clock position, measure the E12 and E13 clearance dimensions as follows:
(a) Pull the end of the blade to its most forward position.
(b) Use the hole gage, COM-6392 or hole gage, COM-4836 (or the feeler gage) to measure
the clearance between the end of the blade and the shroud.
(c) Make a record of the E12 and E13 clearance.
SUBTASK 72-31-02-934-023-G00
(7) Identify the blade with the minimum clearance at E12 and E13 as the longest blade.
(a) The clearance of this blade must be no less than 0.065 inch (1.65 mm) at E12 and 0.075
inch (1.91 mm) at E13.
SUBTASK 72-31-02-974-024-G00
(8) Do the steps that follow to calculate the average rotor runout at E12 and E13.
(a) Add the clearance for all the 38 blades.
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-31-02
NoC
Page 408
D633T1B7 Aug 22/2020
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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