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 CAUTION: MAKE SURE THE TEMPERATURE OF THE INSPECTION AREAS ARE BELOW
_______ 150°F (65.6°C) BEFORE YOU USE THE BORESCOPE. IF THE CASES ADJACENT TO THE INSPECTION AREAS ARE TOO HOT TO KEEP YOUR HAND ON, YOU CAN CAUSE DAMAGE TO THE BORESCOPE.
 (5)  
Put a flexible borescope along the flow path of the 2.5 bleed air to examine the condition of the 4th-stage LPC vanes and blades (Refer to Fig. 608 for the AP-1 access port locations and borescope data).

 S 216-143-N00

 (6)  
If you find damage that is more than the limits, examine it to find if the area is a defect or a blend repair.

 NOTE: Repaired areas have a 4 to 1 length to depth ratio and have
____ smooth round corners. This is important because a repaired area can possibly be more than the continue-in-service limits that follow. The limits are only for defects and not to areas that are repaired.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE  A 
(AP-1) DUCT BLEED VALVE  (INNER FRONT) FAN EXIT LINER SEGMENT  FAN EXIT LINER SEGMENT (INNER REAR)  A  ACCESS PORT AP-1 FAN EXIT LINER SEGMENT (INNER FRONT) (BLEED VALVE DUCTS) 14 LOCATIONS) (EXAMPLE, 
BLEED VALVE DUCT SCREEN  A 
2.5 BLEED RING (OPEN POSITION)  FAN EXIT VANE 

4TH-STAGE  FWD 
LPC BLADE 
SEE  B  FAN EXIT PATH (EXAMPLE) 
A 
4TH-STAGE 
LPC VANE 
SEE  C 
FWD 
2.5 BLEED VALVE 
INTERNAL FLOWPATH 
L-A0604  A-A 

4th-Stage LPC Blade/Vane Wear Limits
Figure 609 (Sheet 1)

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AREA A

4th-Stage LPC Blade/Vane Wear Limits
Figure 609 (Sheet 2)

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No. 14 - LPC 4th-Stage Blade and Vane Inspection
________________________________________________
 S 226-144-N00
 (7)  
Compare the defects with the continue-in-service limits in Fig. 609.

 (a)  
The continue-in-service limits for the 4th-stage LPC vane are as follows: 1) Nicks or dents that are on a leading or a trailing edge

 must be less than 0.050 inch (1.270 mm) in depth. 2) The minimum distance between damaged areas that are on the same edge is 0.500 inch (12.700 mm). 3) Damage on one edge must not be directly opposite the damage on the other edge. 4) The distance from damage on one edge to damage on the opposite edge must be more than the vane width average. 5) In area A, dents on the concave or the convex surfaces must be less than 0.010 inch (0.254 mm) in depth. 6) In area A, the minimum distance between dents on the surfaces is 1.000 inch (25.400 mm). 7) Tears are not permitted in area A.

 (b)  
The continue-in-service limits for the 4th-stage LPC blade are as follows: 1) Damage that is in area A must be less than 0.0312 inch

 (0.792
 mm) in depth. 2) The minimum distance between damaged areas that are on the same edge is 1.000 inch (25.400 mm). 3) Damage on one edge must not be directly opposite the damage on the other edge. 4) The distance from damage on one edge to damage on the

 opposite edge must be more than the vane width average. 5) Rounded dents in area B must be less than 0.0312 inch

 (0.792
 mm) in depth. 6) Tears are not permitted in area B. 7) Defects are not permitted in area C, but the perimeters of
　
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