SUBTASK 72-00-00-012-054-G00
WARNING
OBEY THE INSTRUCTIONS IN THE PROCEDURE TO OPEN THE THRUST
REVERSERS. IF YOU DO NOT OBEY THE INSTRUCTIONS, INJURIES TO
PERSONS AND DAMAGE TO EQUIPMENT CAN OCCUR.
(2) Open the right thrust reverser (PAGEBLOCK 78-31-00/201).
SUBTASK 72-00-00-032-055-G00
(3) Remove the plug from borescope port B1-6 (Figure 203).
SUBTASK 72-00-00-432-056-G00
(4) Put the intrinsically safe borescope, COM-5661 into port B1-6 to look aft at the 7th-stage
compressor rotor blades.
(a) Install the borescope caution streamer, SPL-6917 as necessary.
SUBTASK 72-00-00-982-057-G00
(5) Do the task to pneumatically turn the engine.
NOTE: Use engine core motoring adapter, SPL-12856 and fixture - engine rotation borescope,
SPL-6363.
(a) Turn the N2 rotor in a counterclockwise direction until the first locking-lug comes into view
while you look in the borescope.
NOTE: The Stage 7 compressor rotor blades turn clockwise when seen through the
borescope.
SUBTASK 72-00-00-982-058-G00
(6) Continue to turn the N2 rotor until the second locking-lug comes into view (this is 2 blades after
the first locking-lug).
SUBTASK 72-00-00-982-059-G00
(7) Slowly turn the N2 rotor until the leading edge of the subsequent blade is in a line (as you look
through the borescope) with the leading edge of the 7th-stage compressor stator blade.
(a) This is blade number 1.
(b) Blade number 2 appears next.
SUBTASK 72-00-00-862-061-G00
(8) Put the pointer on the fixture - engine rotation borescope, SPL-6363 protractor to the zero
degree point.
NOTE: You have identified the zero degree point for the N2 rotor. The zero degree point can
be used for all stages of the high pressure compressor and two stages of the high
pressure turbine rotor. When you do an inspection of the blades of each stage, you
must start with the N2 rotor positioned back to the zero degree point.
SUBTASK 72-00-00-862-066-G00
(9) Continue the procedure as necessary.
(a) Stop the procedure at 344 degrees, and set the pointer back to zero degree.
NOTE: You must set the pointer back to zero degree after one complete (265 degree)
turn of the N2 rotor. This is because of the gear ratio differences between the
accessory gearbox and the N2 rotor.
SUBTASK 72-00-00-432-063-G00
(10) Install the plug in borescope port B1-6.
(a) Tighten the plug to 40-60 pound-inches (4.5-6.8 N.m).
767
AIRCRAFT MAINTENANCE MANUAL
CF6-80A SERIES ENGINES
72-00-00
NoC
Page 210
D633T1B7 Dec 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ECCN 9E991 BOEING PROPRIETARY - Copyright © Unpublished Work - See title page for details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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