5 If the borescope plug is broken or if the inner plug does not
_ come out with the outer plug, remove the broken inner plug with a deep socket wrench (Ref. TASK 72-31-00-300-002).
(5) Connect the fiber light cable to the fiberscope (green or blue band) from the BORESCOPE KIT (856A1320P04 or P05) and to the port on the BORESCOPE - LIGHT SOURCE SET (856A1322P01 through P07). Turn the light source on.
(6) If you use the MOTOR, DRIVE - CORE ENGINE ROTATION (856A1488P01 or P02) to turn the core engine, do an inspection of the compressor blades as follows. If you use the breaker bar to turn the core, go to step (7).
(a) Index the core engine to zero as follows:
1 Put the fiberscope into the stage 3 borescope port (S4) and
_ look aft to the stage 4 compressor blade platform.
2 While you look in the fiberscope turn the core clockwise (CW),
_ as seen from the front of the engine, using the MOTOR, DRIVE -CORE ENGINE ROTATION (856A1488P01 or P02).
3 Turn the core until you see the first blade slot locking lug.
_
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E 56-5B E E E 4 Continue to turn the core until you see the second locking
_ lug. The second locking lug is 2 blades past the first locking lug.
5 Align the leading edge of the first blade past the second
_ locking lug with the leading edge of the nearest stage 4 vane. This is the zero index point and blade number 1.
6 Set the pointer on the protractor to the zero degree mark. The
_ core engine is now set to the zero index point for inspection of all stages of the compressor rotor.
(b) Do an inspection of stage 4 compressor blades while you turn the core engine using the MOTOR, DRIVE - CORE ENGINE ROTATION (856A1488P01 or P02).
(c) Use the limits found in step 4.B.
(d) Remove the fiberscope and insert the fiberscope in the borescope plug of the next stage to be inspected.
(e) If the vane segments in stages 6, 7 and 8 have moved to partially cover the borescope port, do step (8).
(7) If you use the breaker bar to turn the core engine, do an inspection of the compressor blades as follows.
(a) Insert the fiberscope in the borescope port of the stage you want to inspect.
(b) Do an inspection of the compressor blade you see. Use the limits found in the inspection table.
(c) Rotate the core engine so that you can see the next blade. Use the breaker bar to turn the core engine clockwise (CW).
NOTE : To turn the core engine CW, the handcranking drive must be
____
turned counterclockwise (CCW).
(d) Repeat steps (b) and (c) until you have inspected all of the blades in that stage. Count the blades as you inspect them to make sure all of the compressor blades are inspected. The number of blades in each stage is:
1 Stage 1 : 38 blades
_
2 Stage 2 : 53 blades
_
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3 Stage 3 : 60 blades
_
4 Stage 4 : 68 blades
_
5 Stage 5 : 75 blades
_
6 Stage 6 : 82 blades
_
7 Stage 7 : 82 blades
_
8 Stage 8 : 80 blades
_
9 Stage 9 : 76 blades
_
(e) Repeat steps (a) thru (d) for the other stages to be inspected.
(f) If the vane segments in stages 6, 7 and 8 have moved to partially cover the borescope holes (S7 through S9), do step (8).
(8) To inspect the stages 6, 7, 8 and 9 blades when the vane segments have moved to partially cover the borescope holes, use the alternatives that follow:
CAUTION : MAKE SURE THE FLEXIBLE BORESCOPE DOES NOT GET CAUGHT IN THE
_______
BLADES WHILE YOU TURN THE CORE.
(a) If the diameter of the borescope holes are larger than 0.24 in.
(6.01 mm) , do the borescope inspection using the FIBERSCOPE SET (856A1321P01 through P03).
(b) If the diameter of the borescope holes are less than 0.24 in.
(6.01 mm) , do the following steps:
1 Put a tapered rod in the borescope hole. The rod must be made
_ from 0.37 in. (9.40 mm) diameter aluminum, 18 in. (0.46 mm) long, with a 4 in. (101.60 mm) taper at one end. The tapered end must be rounded to 0.062 in. (1.57 mm) radius, accurate radius not necessary.
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