4. Procedure_________ (Ref. Fig. 601/TASK 72-54-00-991-300, 602/TASK 72-54-00-991-301, 603/TASK 72-54-00-991-302)
Subtask 72-54-00-010-084
A. Removal of the Borescope Plugs
(1) Let the temperature of parts decrease to ambient temperature. PRE SB CFMI 72-0376
(2) Cut and remove the lockwires. Then, remove the borescope plugs S16, S17, S18, S19 and S20.
NOTE : The borescope plugs S16 and S17 are in the same plane and
____ located respectively, at 5:30 and 8:30 (ALF) immediately in front of combustion case aft flange. The borescope plugs S18, S19 and S20 are located at 5:00 o'clock (ALF) on the LPT case. From front to rear they relate approximately to the 2nd, 3rd and 4th LPT stages.
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END OF PRE SB CFMI 72-0376
POST SB CFMI 72-0376
(3) Cut and remove the lockwires. Then, remove the borescope plugs S16, S17.
NOTE : The borescope plugs S16 and S17 are in the same plane and
____ located respectively, at 5:30 and 8:30 (ALF) immediately in front of the combustion case aft flange.
(4) Remove the self locking borescope cap assemblies S18, S19 and S20. NOTE : The borescope cap assemblies S18, S19 and S20 are located at
____ 5:00 o'clock (ALF) on the LPT case. From front to rear they relate approximately to the 2nd, 3rd and 4th LPT stages.
END OF SB CFMI 72-0376 Subtask 72-54-00-480-057
B. Install the BORESCOPE KIT (856A1320P04/P05) as follows:
(1) Connect the power supply. CAUTION : BEFORE YOU CONNECT THE POWER SUPPLY TO THE POWER SOURCE BE
_______ SURE THE ON-OFF SWITCH IS IN THE OFF POSITION AND LIGHT INTENSITY CONTROL IS SET TO MINIMUM. MAKE SURE THAT PROJECTOR AND POWER SUPPLY ARE CORRECTLY GROUNDED.
(a) Connect power supply to a grounded 110 VAC 60 Hz power source.
(2) Connect light source cable to rigid borescope and to port on BORESCOPE - LIGHT SOURCE SET (856A1322P02/P03/P04/P07/P08).
(3) Turn light source on; insert borescope and position it as desired for inspection.
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C. Inspect the Stage 1-4 Outer Stationary Air Seals for the Following NOTE : The limits given below are for the stationary air seal areas you
____
can see near the borescope holes.
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Stage 1-3 stationary air seals.
A. Rub marks or Not deeper than 0.08 in.
chicken marks from (2.03 mm)
seal teeth.
2. Stage 4 stationary air seals.
NOTE : This inspection is only to be done when stage 4 blades are shingled
____
or unlatched.
A. Worn, jagged or Not more than 0.08 in. See limit extensions crushed honeycomb (2.03 mm) (Ref. TASK 72-00-00-200-material. 025).
3. Stage 1/4 stationary air seals.
A. Distortion Any quantity if shroud
does not come out.
Subtask 72-54-00-080-057
D. Removal of Borescope
(1) When inspection is complete, turn lamp switch off, leave main light source blower on for a while to cool and housing.
(2) Remove the borescope.
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Subtask 72-54-00-410-072
E. Install the Borescope Plugs
PRE SB CFMI 72-0376
(1) Apply graphite grease (Material No. CP2101) or Never Seez-Pure Nickel, Special (Material No. CP2619), to the threads of the borescope plugs S16, S17, S18, S19, S20 and install on the combustion case (S16, S17) and on the LPT case (S18, S19, S20).
END OF PRE SB CFMI 72-0376
POST SB CFMI 72-0376
(2) Apply graphite grease (Material No. CP2101) or Never Seez-Pure Nickel, Special (Material No. CP2619), to the threads of the borescope plugs S16, S17 and install on the combustion case (S16, S17).
(3) Apply graphite grease (Material No. CP2101) to the threads of the self locking borescope cap assemblies S18, S19, S20 and install on the LPT case (S18, S19, S20).
END OF SB CFMI 72-0376
PRE SB CFMI 72-0376
(4) TORQUE plugs to between 55 and 60 lbf.in (0.62 and 0.67 m.daN) and safety with lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8001) or lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8002)
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