(a) Remove the initial balance screws from the selection number 3 spinner hole locations.
1) Make a record of the location of each of the screws that you remove.
2) Keep the screws because you will need to put them back in the same location.
(b) Install the three P06 balance screws.
1) Tighten the screws to 50-75 pound-inches (5.6-8.4 newton meters).
SUBTASK 72-31-00-945-029-G00
(2) Remove the protective mats from the internal inlet cowl.
SUBTASK 72-31-00-865-067-G00
(3) Do the steps in the Operate the Engine paragraph.
NOTE: Operate the engine at the same N1 speed (rpm) that was used for the initial engine
run.
SUBTASK 72-31-00-945-024-G00
(4) Put protective mats, STD-6378 on the bottom half of the internal inlet cowl.
SUBTASK 72-31-00-035-068-G00
(5) Remove the three P06 balance screws from the selection number 3 locations.
SUBTASK 72-31-00-435-069-G00
(6) Install the initial screws that were replaced by the three P06 screws.
(a) Tighten the screws to 50-75 pound-inches (5.6-8.4 newton meters).
SUBTASK 72-31-00-945-030-G00
(7) Remove the protective mats from the internal inlet cowl.
J. Analysis
SUBTASK 72-31-00-975-053-G00
(1) Make a Three Try Graph on polar graph paper as follows (Figure 510):
(a) Make a circle that has a radius (in mils) the length of the initial imbalance Uo.
(b) Make an arc to show U1.
1) Put the center of the arc at the 0 degree position on the circle.
2) The length of the arc radius (in mils) is equal to U1.
(c) Make an arc to show U2.
1) Put the center of the arc at the 123 degree position on the circle.
2) The length of the arc radius (in mils) is equal to U2.
(d) Make an arc to show U3.
1) Put the center of the arc at the 246 degree position on the circle.
2) The length of the arc radius (in mils) is equal to U3.
(e) Find the point where the three arcs intersect.
1) If the three arcs do not intersect, make a point at the center of the area contained by
the three arcs.
2) If the center of the area cannot be found, increase the weight of WT by 50 percent
and repeat the procedure.
(f) Make a line from the center of the initial circle to the point where the three arcs intersect.
This line is R1.
1) Measure and make a record of the length of R1.
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-31-00
NoC
Page 523
D633T1B7 Aug 22/2017
ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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