3RD- AND 4TH-STAGE BOOSTER BLADES AND VANE BORESCOPE INSPECTION
S-M56-MM-0975-(1)-00-B
2nd- thru 4th-Stage Booster Blade and Vane Borescope Inspection Figure 602 (Sheet 1)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
BOOSTER BORESCOPE FWD
PORT S0
S-M56-MM-0974-(1)-01-C
STAGE BLADES NO. OF VIEW PORT NO. LEADING EDGE VIEW PORT NO. TRAILING EDGE
1 38 - -
2 68 - -
3 68 - S0
4 68 S0 -
2nd- thru 4th-Stage Booster Blade and Vane Borescope Inspection Figure 602 (Sheet 2)
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
LPC Blades and Vanes (1st- thru 4th-Stage) - Inspection
_______________________________________________________
WARNING:_______ BE CAREFUL WHEN YOU TURN THE FAN ROTOR. MAKE SURE YOU ARE
IN A STABLE POSITION. ALSO, YOU MUST WEAR HEAVY
PROTECTIVE GLOVES TO PREVENT DAMAGE TO YOUR HANDS. IF YOU
DO NOT OBEY THESE INSTRUCTIONS, INJURIES TO PERSONS AND
DAMAGE TO EQUIPMENT CAN OCCUR.
(c) While you manually turn the fan rotor from the fan inlet, examine the 2nd-stage rotor blades (Fig. 603 and 604):
NOTE: If you find damage, you must examine all of the
____ downstream booster stages and the HP compressor.
1) Look for missing pieces in Area G and the tip corners of the leading and trailing edge. a) A maximum of 20 damaged blades is permitted if the
axial or radial length is less than 0.256 inch (6.5 mm).
b) A maximum service extention of 50 cycles/75 hours is permitted if the radial length is less than 0.787 inch (20 mm) and the axial length is less than 0.492 inch
(12.5 mm). 2) Look for cracks or tears in Area G a) No maximum number if the radial length and the axial length is less than 0.256 inch (6.5 mm).
b) A maximum service extention of 50 cycles/75 hours is permitted if the radial length is less than 0.787 inch (20 mm) and the axial length is less than 0.492 inch
(12.5 mm).
3) Look for worn areas or local distortion at the blade tip corner on the leading and trailing edges. a) No maximum limit if the radial length is less than
0.787 inch (20 mm) and the axial length is less than
0.492 inch (12.5 mm).
b) A maximum service extension of 100 cycles/150 hours is permitted if you obey these conditions:
1. The radial length is less than 0.984 inch (25 mm)
_ and the axial length is less than 0.59 inch (15 mm).
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
AA
DAMAGE ON THE LEADING OR TRAILING EDGE
SEE A SEE B
EDGE TRAILING A-A
LEADING EDGE DAMAGE ON THE CONVEX OR CONCAVE SIDE
BOOSTER VANE ASSEMBLY
A
AXIAL DAMAGE LOCAL WEAR ON THE TIP CORNER
EDGE DAMAGE ON TRAILINGTHE EDGE LEADING RADIAL EDGE LEADING NICKS DENTS OR E 0.4 (10)
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