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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////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 | ....................................................…............................ | Nicks and | Leading | Nicks and rounded bottom dents that are not more than| | Dents | Edge, | 0.125 inch (3.175 mm) in length or diameter, and | | | Airfoils, | 0.0312 inch (0.792 mm) in depth | | | | | | | Platforms ____If View Angle is such that depth can be
| NOTE: | | | | determined, the maximum nick and round bottom | | | | dent depth is 0.312 inch (0.792 mm). | | ..................................................................... | | Trailing | On each vane, no more than two nicks or dents, at the| | | Edge | given limits, that are apart by a minimum of 0.750 | | | | inch (19.050 mm). No more than five vanes at the | | | | given limits on each engine. | | | | | | | | Five Vanes Maximum Per Engine. | ................................................................................. | Worn | All | All quantities. | | Surface | | | | Layer | ____Prolonged operation with severe coating loss
| NOTE: | | | | will eventually lead to base material | | | | burning, erosion, or material degradation, | | | | such that the vane may become non-repairable. | .................................................................................
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 | ....................................................…............................
| Burned | All | Permitted with no | Permitted with material |
| Areas, | | apparent material loss, | loss to the material |
| Erosion | | unless view angle is | breakthrough limit of |
| | | such that depth can be | this table. |
| | | determined. The maximum | |
| | | depth permitted is | |
| | | 0.0312 inch (0.792 mm). | |
| | | | |
| | | Largest single burned or | Largest single burned or |
| | | eroded area is .15 inch | eroded area is .5 inch |
| | | in diameter and no more | in diameter and no more |
| | | than 0.02 square inch | than 0.07 square inch |
| | | (13.0 square mm) in area.| (45.0 square mm) in area. |
| | | | |
| | | NOTE:____ See Material Breakthrough or Burn Through if |
| | | exceedance of reduced interval inspection |
| | | limit. |
| | | |
| | | Cracks associated with a burned or eroded are |
| | | permitted to the crack length limit of this table. |
................................................................................. | Burned or | All | None | Holes broken through to | | Broken | | | the internal cavity that | | Holes in | | | are less than 0.500 inch | | the Base | | | (12.700 mm) in diameter. | | Material | | | No more than five vanes | | | | | at the given limits in | | | | | each engine. | 2...........…............…..........................…...........................1 | Cracks, | Leading | All quantities of cracks between two adjacent cooling| | Axial and | Edge | air holes, if there are a minimum of three holes in a| | Radial | | row without cracks, in all directions around each | | | | crack. | | | ........................................................
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