2) Use the manual or pneumatic crank procedure (PAGEBLOCK 72-00-00/201) to turn
the N2 rotor.
(b) When you locate a nicked blade, lock the N2 rotor in position.
NOTE: You can put your hand through the open VBV door to adjust the location of the
nicked blade. Be sure you have finished the blade adjustment before you lock the
N2 rotor.
SUBTASK 72-35-00-358-092-G00
(2) Repair the blade as follows:
(a) Remove the nick from the blade leading edge in the longitudinal direction only (parallel
with the length of the blade).
(b) Use a abrasive, B00138 or an pumice abrasive, B00166 to make the surface smooth.
(c) The surface finish after the repair must be equivalent to the original contour.
(d) The length of a smooth area should be a minimum of 16 times the depth of the damage.
(e) If two or more smoothed areas overlap, remove the high metal at the overlap to prevent a
stress concentration.
(f) The leading and trailing edge radius of the nick repair area must be equivalent to the
original contour.
SUBTASK 72-35-00-758-093-G00
(3) Examine the repair area for cracks.
(a) No cracks are permitted.
SUBTASK 72-35-00-418-094-G00
(4) Install the number three VBV door as follows (Figure 805):
(a) Put the VBV and the hinge assembly on the fan frame bypass port.
(b) Install the VBV and the hinge assembly with the two fan frame bolts, two washers, and
two nuts.
1) Put the bolt head aft and put a washer under the bolt head.
2) Tighten the nuts to 33-37 pound-inches (3.7-4.2 Newton meters).
(c) Attach the bypass valve bellcrank to the unison ring with a bolt.
1) Tighten the bolt to 190-230 pound-inches (21.5-26.0 Newton meters).
(d) Assemble the bypass valve bellcrank, with the rod-end bearing to the VBV.
(e) Use a spray gun to put a thin layer of release agent compound on the part of the VBV
that touches the fan frame.
CAUTION
DO NOT PERMIT THE BEARING TO MOVE WHEN YOU INSTALL THE
BOLT. IF YOU PERMIT THE BEARING TO MOVE, THE BLEED VALVE
CAN BECOME OUT OF ADJUSTMENT.
(f) Attach the rod-end bearing to the VBV with a clevis bolt, two washers, and nut.
1) Tighten the nut to 55-70 pound-inches (6.2-7.9 Newton meters).
SUBTASK 72-35-00-418-095-G00
(5) Install the number one acoustic liner in position immediately above the 3 o'clock location (aft to
forward) (Figure 804) as follows:
(a) Make sure all the mating surfaces are clean and without deterioration.
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-35-00
NoC
Page 814
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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