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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
~............................................................................... | TABLE 609 | ................................................................................. | | | 1ST-STAGE HPT VANES | | | | CONTINUE-IN-SERVICE LIMITS | | CONDITION | ........................................................ | FOUND | VANE | PERMITTED WITH REGULAR | PERMITTED WITH DECREASED | |FIGURE 621 | AREA | TIME INSPECTION | TIME INSPECTION | ....................................................…............................ | Cracks, | Concave | Three radial cracks not | All quantities of radial | | Axial and | Airfoil | more than 0.5 inch | cracks not more than | | Radial | Surface | (12.7 mm) in length, on | 0.8 inch (20.32 mm) in | | | (View B) | each vane. | length. | | | ...........................…............................ | | | Cracks on inner diameter or outer diameter platforms | | | | cannot connect with cracks on the airfoil surface. | | | ........................................................ | | | Cracks that connect with | Cracks that connect with | | | | other cracks and go no | other cracks and go no | | | | more than 0.4 inch | more than 0.8 inch | | | | (10.160 mm) from the | (20.32 mm) from the | | | | connection point. | connection point. | ....................................................…............................ | | Convex | All axial or radial cracks that are no more than | | | Airfoil | 0.15 inch (3.180 mm) in length. | | | Surface | | | | (View C) | No circular cracks or areas where material will | | | | break off. | | | | | | | ____All parts of cracks that are burned or have
| NOTE: | | | | erosion with an opening more than 0.05 inch | | | | (1.27 mm) in width are the same as holes; the | | | | burned and broken hole limits are applicable. | | | | | | | | Cracks on inner diameter or outer diameter platforms | | | | cannot connect with cracks on the airfoil surface. | 2...........…............…......................................................1
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
~............................................................................... | TABLE 609 | ................................................................................. | | | 1ST-STAGE HPT VANES | | | | CONTINUE-IN-SERVICE LIMITS | | CONDITION | ........................................................ | FOUND | VANE | PERMITTED WITH REGULAR | PERMITTED WITH DECREASED | |FIGURE 621 | AREA | TIME INSPECTION | TIME INSPECTION | ....................................................…............................ | Cracks, | Convex | Cracks that connect with | Cracks that connect with | | Axial and | Airfoil | other cracks and go no | other cracks and go no | | Radial | Surface | more than 0.4 inch | more than 0.8 inch | | | (View C) | (10.160 mm) from the | (20.32 mm) from the | | | | connection point. | connection point. | | | ........................................................ | | | No more than three axial | No more than six axial | | | | cracks on each vane with | cracks on each vane with | | | | a maximum depth of | a maximum depth of | | | | 0.50 inch (12.70 mm). | 0.80 inch (20.320 mm). | | | | Also, one of the three | Also, one of the six | | | | axial cracks can go from | axial cracks can go from | | | | the trailing edge to a | the trailing edge to a | | | | maximum distance of 0.75 | maximum distance of 1.30 | | | | inch (19.050 mm). | inches (33.020 mm). | | | ........................................................ | | | Three radial cracks not | All quantities of radial | | | | more than 0.50 inch | cracks not more than | | | | (12.70 mm) in length, on | 0.80 inch (20.320 mm) | | | | each vane. | in length. | | | ........................................................ | | | Radial cracks that start | Radial cracks that start | | | | on the inner diameter or | on the inner diameter or | | | | outer diameter platform | outer diameter platform | | | | are permitted to a maxi- | are permitted to a maximum| | | | mum height or distance of| height or distance of | | | | 0.50 inch (12.70 mm). | 0.80 inch (20.320 mm). | 2...........…............…..........................…...........................1
　
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