stage. 3) Bends must be smooth and continuous without tears or cracks. 4) No more than one bend is permitted on each blade.
(e)
Examine the 9th- thru 15th-stage of the HPC for tangential blade locks that are loose or incorrectly installed. 1) The engine cannot stay in operation if there are more than
two loose tangential blade locks on each stage. 2) If there are two or less, repair them during the regularly scheduled time to disassemble the HPC.
CAUTION: USE CAUTION WHEN YOU USE THESE LIMITS TO MAKE A DECISION
_______ ABOUT THE CONDITION OF THE ENGINE. THE BORESCOPE INSPECTION LIMITS ARE A RESULT OF TESTS AND STRUCTURAL ANALYSIS. THE PART LIFE AND THE PERFORMANCE OF THE ENGINE CAN DECREASE QUICKLY WHILE THE DAMAGE OF THE PARTS BECOMES NEAR THE MAXIMUM CONTINUE-IN-SERVICE LIMITS.
(f) Examine the HPC 5th- thru 15th-stage blades for nicks and dents. 1) 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 apply only to defects and not to repaired areas.
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BLADE TIP
SEE
A
5TH- THRU 7TH-STAGE BLADE (EXAMPLE) 5TH- THRU 7TH-STAGE CURLED LEADING EDGE/TIP
1. 0.500 INCH (12.700 mm) MAXIMUM
2. 0.250 INCH (6.350 mm) MAXIMUM
3. 90` MAXIMUM
4. LEADING EDGE SHOULD BE CONTINUOUS AND SMOOTH
5. NO DENTS, GOUGES, CRACKS, OR SCRATCHES PERMITTED ON BEND RADII
FOR LENGTH OF BEND (INDEX 6)
6. LENGTH OF BEND
L-A2696
5th- thru 7th-Stage Curled Blade Leading Edge and Tip Limits
Figure 611 (Sheet 1)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
8
(SHOWN LARGER) B-B
7
BENT LEADING EDGE ON 5th- THRU 7th-STAGE BLADES
(SHOWN LARGER) C-C
7. HPC 6TH- AND 7TH-STAGE BLADES - 0.030 INCH (0.762 mm) MAXIMUM. HPC 5TH-STAGE BLADES - 0.045 INCH (1.143 mm) MAXIMUM.
8. HPC 6TH- AND 7TH-STAGE BLADES - 0.030 INCH (0.762 mm) MAXIMUM. HPC 5TH-STAGE BLADES - 0.045 INCH (1.143 mm) MAXIMUM. MAXIMUM DISTANCE, IN ALL DIRECTIONS, FROM THE USUAL BLADE CONTOUR:
9. BENDS THAT ARE LESS THAN INDICES 7. AND 8. ARE PERMITTED IN THIS AREA.
10. NO BENDS ARE PERMITTED IN THIS AREA. L-A7170
5th- thru 7th-Stage Curled Blade Leading Edge and Tip Limits
Figure 611 (Sheet 2)
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0.25 INCH
(6.35 mm) D 0.25 INCH (6.35 mm)
D D
C B A C
LEADING EDGE TRAILING EDGE
E B E (6.35 mm) 0.25 INCH D D (6.35 mm) 0.25 INCH
(12.70 mm) DFILLET AREA 0.50 INCH D C B A C
5TH-STAGE HPC BLADE LEADING EDGE TRAILING EDGE
1189 L-A2690 E B E
D FILLET AREA D (12.70 mm) 0.50 INCH
6TH-STAGE HPC BLADE
L-A2689
HPC Blade Continue-In-Service LimitsFigure 612 (Sheet 1)
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