1  FOR SPECIFIED ACCESS 
TO FIG. 601 PORT LOCATION, REFER  A  A  B  B  BYPASS VALVE FOR THE FUEL/OIL 
COOLER (REF) 

ACCESS PORT AP-3 (231`)
FWD
ACCESS PORT AP-2 (233`)
A
BORESCOPE POSITIONING BORESCOPE
PATH POSITIONING LEVER LEVER FOR PATH
FOR THE STATOR VANE  THE STATOR VANE
AP-2 PLUG CONTROL RING FOR AP-3 PLUG THE 5TH-STAGE STATOR VANE CONTROL RING FOR THE 6TH-STAGE STATOR VANE
6TH-STAGE
FWD 5TH-STAGE
HPC BLADE
HPC BLADE  6TH-STAGE HPC BLADE
7TH-STAGE 5TH-STAGE 6TH-STAGE HPC BLADE HPC VANE HPC VANE FWD
A-A  B-B
L-A1111L-A1101
HPC Access Port Locations Figure 610 (Sheet 1)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
FUEL FLOW METER (REF) FWD
CC
MAIN
FUEL
LINE

FWD
(REF)

9TH-STAGE HPC BLADE
ACCESS PORT AP-4 (127`)
B
MAIN OIL FILTER HOUSING (REF) DEOILER (REF) HPC REAR CASE
D D
AP-5 INNER PLUG
BORESCOPE PATH FWD
ACCESS PORT AP-5 (214`)
C
HPC Access Port Locations Figure 610 (Sheet 2)
BORESCOPE PATH
AP-4 PLUG
L-A1110
8TH-STAGE
8TH-STAGE HPC BLADE
HPC VANE
C-C
11TH-STAGE HPC VANE
11TH-STAGE HPC BLADE
10TH-STAGE HPC VANE
10TH-STAGE HPC BLADE
KEY WASHER  FWD 
D-D  OUTER PLUG AP-5  L-A1115 

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ACCESS PORT AP-7 (80`)
TURBINE CASE COOLING VALVE CONTROL CABLE (REF)
FF

E  E 
FWD 
MAIN FUEL 
LINE (REF) 
ACCESS PORT AP-6 (98`) 
TURBINE BLADE/VANE 
D  COOLING AIR VALVE (REF) 
BORESCOPE 
PATH  BORESCOPE 
FLANGE K  PATH 
AP-6 PLUG  (REF) 
KEY WASHER  AP-7 
FWD  HPC REAR CASE  OUTER PLUG 
AP-7 
INNER PLUG 

FWD 
13TH-STAGE 
HPC VANE 
12TH-STAGE  14TH-STAGE
13TH-STAGE  HPC VANE  15TH-STAGE  14TH-STAGE  HPC BLADE 
HPC BLADE  HPC BLADE  HPC VANE 
L-A1124  E-E  F-F  L-A1134 
HPC Access Port Locations 
Figure 610 (Sheet 3) 

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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
No. 15 - HPC Vane and Blade (5th- through 15th-Stage) Inspection
________________________________________________________________
 (c) Examine the 5th- thru 7th-stage blades for curled leading edge tips (Fig. 611). 1) A curled blade has these conditions: a) A three sided corner of blade material with a bend line that goes from the leading edge to the tip b) The bend makes an angle of between 20 and 90 degrees from the usual concave blade contour. 2) The continue-in-service limits that are given are for all areas of the curled blade, but not for the bend line. a) No dents, holes, cracks, or scratches are permitted on the bend line.
 3)  Curled blades must have a minimum of three (3) straight blades between them, with no more than six (6) on each stage.
　
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