Low Pressure Turbine Borescope Inspection
Figure 602/TASK 72-54-00-991-301- 33 (SHEET 3)
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R POST SB CFMI 72-0376
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R (3) Cut and remove the lockwires. Then, remove the borescope plugs S16,
R S17.
R NOTE : The borescope plugs S16 and S17 are in the same plane and____
R located, respectively, at 5:30 and 8:30 (ALF) immediately in
R front of the combustion case aft flange.
R (4) Remove the self locking borescope cap assemblies S18, S19 and S20.
R NOTE : The borescope cap assemblies S18, S19 and S20 are located____
R approximately at 5:00 o'clock (ALF) on the LPT case and, from
R front to rear, relate to the 2nd, 3rd and 4th stages of the
R LPT, respectively.
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R END OF SB CFMI 72-0376
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Subtask 72-54-00-480-054
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, 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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Subtask 72-54-00-290-054
C. The stage 1-3 LPT rotor blades are long span blades. To fully examine the airfoil surface, it is recommended to do as follows:
(1) Turn the fan rotor slowly and smoothly to examine the blades.
(2) Change the probe engagement depth so as to see the blade airfoils as they move in front of the probe.
(3) While you adjust the probe engagement depth, turn the probe about its axis (azimuth) to get a maximum view, for a given turn speed of the rotor.
NOTE : The blade span increases from the 2nd to the 3rd LPT stage. As
____ the full engagement of the probe is necessary, you may have to make more than one turn of the LPT rotor to see all the blade airfoils.
(4) When you look at the leading edges of the blades, turn the rotor so that their concave side (pressure face) comes toward the borescope.
(5) To look at the trailing edges, turn the rotor in the opposite direction so that the convex side (suction face) of the blades comes toward the borescope.
(6) Do the inspection of the stage 1-3 blades for the damage which follow:
-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Cracks Not serviceable See limit extensions (Ref. TASK 72-00-00-200-025)
R 2. Nicks on concave or Not more than 0.01 in. See limit extensions R convex sides. Does (0.25 mm) deep for stage (Ref. TASK 72-00-00-200-R not include areas E. 1 and 0.02 in. (0.5 mm) 025)
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