R END OF PRE SB CFMI 72-0376 R R POST SB CFMI 72-0376 R
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R (3) Remove the self locking borescope cap assembly S20.
R R NOTE : The plug S20 is the aftmost borescope cap assembly located at____ 5:00 o'clock on the LPT case (ALF).
R R END OF SB CFMI 72-0376
R (4) Locate the instrumentation boss located at the 8:30 o'clock position (ALF) on the turbine frame.
(a) Remove the 2 bolts and nuts which attach a blanking plug to this turbine frame boss.
(b) Remove the blanking plug and its gasket.
NOTE : This gives you a borescope access to look at the trailing____ edge and tip shroud of the stage 4 LPT blades.
Subtask 72-54-00-480-055
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 the power supply to a grounded 110 VAC 60Hz 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.
Subtask 72-54-00-290-055
C. The stage 4 LPT rotor blades are long span blades. To fully examine their airfoil surface, it is recommended to do these steps.
(1) Turn the fan rotor slowly and smoothly to examine the blades.
(2) Change the probe engagement depth to see the airfoils as the blades move in front of the probe.
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(3) While you change the probe engagement depth, turn the probe (azimuth). This will let you have a maximum view for given turn speed of the rotor.
NOTE : The stage 4 blades have the longest span of the blade stages.
____ So, as the full engagement of the probe is necessary, you may have to make 2, 3 or more turns of the LPT rotor to see all the blade areas.
(4) When you look at the leading edges of the blades, turn the rotor so that the concave side (or pressure face) of the blades comes toward the borescope.
(5) When you look at the trailing edges, turn the rotor in the opposite direction so that the convex side (suction face) comes toward the borescope.
(6) Do the inspection of the stage 4 blades for the damage which follow:
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Cracks
R 2. Nicks on concave or
R convex sides. Does
R not include area E.
R 3. Dents on concave or
R convex sides. Does
R not include area E.
R 4. Nicks and/or dents on
R leading or trailing
R edges. Does not
R include area E.
5. Nicks and/or dents in
area E.
Not serviceable
Not more than 0.02 in.
(0.5 mm) deep.
Not more than 0.01 in.
(0.25 mm) deep
Not more than 0.02 in.
(0.5 mm) deep
Not more than 0.01 in.
(0.25 mm) deep See limit extensions (Ref. TASK 72-00-00-200-025)
See limit extension (Ref. TASK 72-00-00-200-025)
See limit extensions (Ref. TASK 72-00-00-200-025)
See limit extensions (Ref. TASK 72-00-00-200-025)
See limit extensions(Ref. TASK 72-00-00-200-025)
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-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
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