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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 17 - HPT (1st- and 2nd-Stage) Blade and Duct Segments, and (1st-Stage)
__________________________________________________________________________ Vane Inspection
_______________
 (b)  Use these limits when you examine the 1st-stage HPT blades (Table 610).
 NOTE: The first sign of corrosion on a blade is a circular
____ stain or mark on the outer surface of the blade. A green to white blue color stain is a sign of sulfidation corrosion.
 NOTE: Blade erosion removes the surface layer which is for
____ protection. This will quickly cause deterioration of the inner alloy.
 NOTE: A sign of airfoil growth is when the length of the blade
____ is increased and the perimeter of the middle is decreased.
 1)  If damage is more than the decreased time inspection limits, remove the engine before the 6th cycle.
 2)  If these conditions will quickly occur, immediately remove the engine: part failure, or areas where material will break off.
 S 216-314-N00
 (7)  
Examine the HPT 1st stage duct segments for spalling (ceramic coating which is missing).

 (a)  
All quantities of spalling are permitted.

 (b)  
Ceramic spalling causes the conditions that follow: 1) Increase tip clearance of the HPT 1st stage blade. 2) Increase EGT. 3) Increase fuel consumption. 4) Possible damage to the tip of the HPT 1st stage blades. 5) Possible damage to the HPT 2nd stage blades.

 (c)  
If the HPT 1st stage duct segments are spalled, do the inspection of the HPT 1st and 2nd stage blades for damage.

 S 216-315-N00
 (8)  
Examine the HPT 2nd stage duct segments for spalling (ceramic coating which is missing).

 (a)  
All quantities of spalling are permitted.

 (b)  
Ceramic spalling causes the conditions that follow: 1) Increase tip clearance of the HPT 2nd stage blade. 2) Increase EGT. 3) Increase fuel consumption. 4) Possible damage to the tip of the HPT 2nd stage blades.

 (c)  
If the HPT 2nd stage duct segments are spalled, do the inspection of the HPT 1st and 2nd stage blades for damage.

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COMBUSTION CHAMBER
SEE  C 
SEE  A 
1ST-STAGE 
HPT BLADE 
ACCESS PORT 
AP-9 (93`)  INNER BURNER 
LINER 
BORESCOPE  TRAILING EDGE 
LEADING 
1ST-STAGE  EDGE COOLING 
HPT BLADE  AIR HOLES 
SEE  B 

TIP
0.10 INCH 0.25 INCH
(2.540 mm) (6.350 mm)
AREA B
1.00 INCH 1
(25.400 mm) TRAILING 1ST-STAGE HPT VANE OUTER BURNER EDGE LINER
FRONT ROW OF
COOLING  L-A0597VERTICAL COOLING AREA A AIR SLOTS
HOLES ON THE A CONCAVE SIDE 1
2.80 INCHES LEADING (71.120 mm) EDGE
COOLING
PLATFORM
HOLES

TO AIRFOIL
AREA C FILLET
ALL OF THE TOP RADIUS
SURFACE OF THE PLATFORM
L-A9423 (0994) 1ST-STAGE HPT BLADE 1 AREAS A AND B ARE ON THE CONVEX AND CONCAVE SIDE
(SHOWN TURNED 180`)
OF THE BLADE B
1st-Stage HPT Blade Continue-In-Service Limits Figure 622 (Sheet 1)
E24504
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////

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