CIRCULAR CRACKS (MATERIAL THAT WILL BREAK OFF)
OUTER DIAMETER PLATFORM RADIAL CRACK THAT GOES FROM THE INNER OR OUTER DIAMETER PLATFORM TO THE CONCAVE SURFACE OF THE VANE
REGULAR TIME INSPECTION (CONCAVE AIRFOIL SURFACE)
B AXIAL CRACKS
CIRCULAR CRACKS
(MATERIAL THAT
WILL BREAK OFF)
RADIAL CRACKS DECREASED TIME INSPECTION (CONCAVE AIRFOIL SURFACE)
B
SEE C
AIRFOIL CRACK THAT GOES FROM ONE DOUBLE ROW OF COOLING AIR HOLES TO THE ADJACENT ROW OR FROM THE TRAILING EDGE THROUGH THE LAST ROW OF COOLING HOLES TO THE ADJACENT GROUP OF COOLING AIR HOLES.
L-A1740 (0292)
SEE C
RADIAL CRACK
ONE CRACK THAT CONNECTS
TO A DIFFERENT CRACK
(NO CRACK THAT STARTS
FROM A PLATFORM) L-A1743 (0292)
1st-Stage HPT Vane Continue-In-Service Limits
Figure 621 (Sheet 2)
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
INNER DIAMETER PLATFORM
WILL BREAK OFF OR MATERIAL THAT CIRCULAR CRACKS CRACKS RADIAL AXIAL CRACKS
SEE D
SEE E
OUTER
DIAMETER
PLATFORM
CONNECTED CRACKS
FROM THE TRAILING EDGE AXIAL CRACK THAT GOES RADIAL CRACK THAT GO TO THE INNER DIAMETER OR OUTER DIAMETER PLATFORM
REGULAR TIME INSPECTION
(CONVEX AIRFOIL SURFACE)
L-A1744 (0292)
C
CIRCULAR CRACKS OR MATERIAL THAT WILL BREAK OFF RADIAL AXIAL CRACKS
CRACK
SEE D
SEE E
CONNECTED
CRACKS AXIAL CRACK THAT GOES RADIAL CRACK THAT GO TO
FROM THE TRAILING EDGE INNER DIAMETER OR OUTER
TO THE LAST ROW OF DIAMETER PLATFORM
COOLING AIR HOLES
DECREASED TIME INSPECTION
(CONVEX AIRFOIL SURFACE)
C
L-A1745 (0292)
1st-Stage HPT Vane Continue-In-Service Limits
Figure 621 (Sheet 3)
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CRACK IN THE INNER
PLATFORM-VANE DIAMETER OR OUTER
AIRFOIL FILLET DIAMETER FILLET
RADIUS RADIUS
FWD CRACKS ON THE OUTER DIAMETER PLATFORM, ON THE CONVEX AIRFOIL SIDE
CONNECTED CRACKS ON THE INNER OR PLATFORM-VANEOUTER DIAMETER LEADING EDGEPLATFORM
PLATFORM FILLET RADIUS SURFACE CRACKS ON THE
CIRCUMFERENTIAL CRACK IN THE INNER DIAMETER OR
INNER DIAMETER OR OUTER DIAMETER OUTER DIAMETER
LEADING EDGE FILLET RADIUS PLATFORM
REGULAR TIME INSPECTION FWD (OUTER DIAMETER PLATFORM)
CRACKS IN THE INNER DIAMETER OR OUTER
E
DIAMETER FILLET L-A1746CRACKS ON THE INNER DIAMETER RADIUS
PLATFORM, ON THE CONCAVE AIRFOIL SIDE
REGULAR TIME INSPECTION (INNER DIAMETER PLATFORM)
PLATFORM-VANE AIRFOIL
D L-A1746 FILLET RADIUS AIRFOIL
CRACK FWD
CRACKS ON THE OUTER
DIAMETER PLATFORM, ON
THE CONVEX AIRFOIL SIDE
CONNECTED CRACKS
OUTER DIAMETER PLATFORM ON THE INNER OR PLATFORM SIDE AIRFOIL CONVEX LEADING EDGE PLATFORM-VANE FILLET RADIUS
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