SUBTASK 72-35-00-218-046-G00
(3) Blend Limits for Stage 3-14 Blades (Only):
NOTE: Any amount of edge erosion is permitted (limited by low engine performance and/or
high vibration).
(a) Blending is limited to six blades per stage as follows:
1) Up to 100 percent of Area B (only one tip corner per blade) and/or up to 100 percent
of Area C.
(b) An unlimited number of blades can be blended up to 100 percent of Area A, (only one tip
corner per blade) and/or up to 50 percent of Area C.
F. Procedure
SUBTASK 72-35-00-868-117-G00
(1) Get the HPC blade damage repair records from the Engine Records to compare with the new
inspections.
SUBTASK 72-35-00-848-103-G00
(2) Make sure the task "Preparation for VSV Repairs" has been done.
SUBTASK 72-35-00-988-048-G00
(3) Do this task: How to Identify the Zero Degree Point on the N2 Rotor
(PAGEBLOCK 72-00-00/201).
SUBTASK 72-35-00-848-049-G00
(4) Prepare the blend tool as follows (Figure 812, Figure 813, Figure 814):
CAUTION
MAKE SURE THAT THE DRIVE SHAFT HEAD IS IN THE 90-DEGREE
POSITION WHEN YOU REMOVE, OR INSTALL THE TOOL TIP. IF THE
DRIVE SHAFT HEAD IS IN THE ZERO-DEGREE POSITION, THE DRIVE
BELT WILL DISENGAGE.
(a) Position the drive shaft head to the 90 degree position (Figure 812).
(b) Install the measuring grid tip into the drive shaft head (Figure 814).
(c) Position the measuring grid tip to the zero degree position.
(d) Insert the tool (micro CCD video camera and monitor, SPL-7178, light source,
COM-4964, and light fiberscope cable, SPL-2293) into the borescope port.
(e) Monitor the measuring grid tip and position the drive shaft head to the 90 degree position.
(f) Position the measuring grid tip close to the HPC blade damage area.
(g) Make a record of the damage results, such as the the damage size and location.
1) Compare with the recorded HPC blade blending and damage history form the
engine records.
(h) Compare the recorded blade damage against the allowable blend limits.
(i) If the damage is within the permitted limits, find the length of the blend necessary to keep
the minimum blend radius, see example (Figure 813).
(j) Put the drive shaft head to the zero degree position and remove the tool from the
borescope port.
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-35-00
NoC
Page 827
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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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