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_______________
 (e)  Use these limits when you examine the 2nd-stage HPT blades (Table 611):
 NOTE: The first sign of corrosion on a blade is a circular
____ stain or mark on the outer surface of the vane. 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 from operation before the 6th cycle.
 2)  If these conditions will quickly occur, immediately remove the engine from operation: part failure, or areas where material will break off.
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COTTER PIN
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
LPT COOLING
MANIFOLD (REF) HPT COOLING MANIFOLD (REF)
SEE A  ACCESS PORT AP-10 (139`)
SEE B
GASKET (INSTALLED WITH
LPT CASE
SPLIT SIDE FACING INWARD)
A
PLUG
(INSTRUMENTATION BOSS)

SPRING TENSION WASHER
INSTRUMENTATION
PLUG STOP (COVER)

BOLT (2 LOCATIONS)
B
HPT/LPT Access Port Locations Figure 623 (Sheet 1)
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SEE  C 
NO. 4 TVC AIR DUCT 
OIL TANK FOR THE ENGINE SCUPPER DRAIN TUBE 
DEOILER OUTLET TUBE 
AIR DUCT NO. 3 TVC  SEE  D 
AIR DUCT NO. 3 TVC GASKET  ACCESS PORT AP-11(215`)  FWD  C 
FWD  BORESCOPE PLUG 
(3 LOCATIONS) BOLT  D  0688 L-A4239 
Figure 623 (Sheet 2) HPT/LPT Access Port Locations 

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
TRANSITION DUCT
2ND-STAGE HPT BLADE
SEE A
TRAILING EDGE
HPT COOLING  ACCESS PORT 
MANIFOLDS  AP-10 (139`)  AREA A 
FWD  1.925 INCHES 
BORESCOPE  (48.9 mm) 
(50% SPAN) 

LEADING EDGE
LPT INLET (TRANSITION DUCT) INNER SEGMENTS AREA B 3.08 INCHES BLADE (78.232 mm) TRAILING EDGE (80% SPAN)

2ND-STAGE HPT BLADE
SEE B
AREA C COOLING AIR EXITS SLOTS
BLADE TIP
RUB STRIP 2ND-STAGE HPT BLADE
B
BLADE TIP INLET DUCT2ND-STAGE HPT BLADE (OUTER)LEADING EDGE FWD
SEGMENTS  L-A0603 L-A0660
A
L-B1922
2nd-Stage HPT Blade Continue-In-Service Limits Figure 624
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~..............................................................................
 | TABLE 611 |
 ................................................................................

 |  |  |  2ND-STAGE HPT BLADE  |
 |  |  |  CONTINUE-IN-SERVICE LIMITS  |
 |  CONDITION  |  .....................................................
　
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