because of too much heat.
2) An axial series of damaged louvers, in which each louver has burned or eroded material, is an example of a burned stripe.
3) A hole is caused by too much heat and goes fully through the combustion chamber wall. Holes frequently occur in burned stripes.
(b) Refer to Figure 616, Figure 617, and Figure 618 to help you keep a record of the damage in the combustion chamber assembly.
NOTE: You can write on copies of these figures to keep a
____
record of the damage.
1) Make sure you always use the same words for the same parts as shown in Figure 615.
(c) If damage is more than the decreased time inspection limits, remove the engine before the 6th cycle.
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
~............................................................................... | | TABLE 606 | ................................................................................. | | INNER AND OUTER COMBUSTION CHAMBER ASSSEMBLY (Except Bulkhead)| | | CONTINUE-IN-SERVICE LIMITS | | CONDITION ................................................................. | FOUND | PERMITTED WITH REGULAR | PERMITTED WITH DECREASED | | FIGURE 619 | TIME INSPECTION | TIME INSPECTION | ................................................................................. | Open Holes | Four open holes in each | Six open holes in each | | that are | assembly. | assembly. | | Burned Through| | | | | The maximum diameter of each hole is 0.500 inch (12.700 mm) | | | 0.19 square inch (123 square mm). | | | | | | There must be a minimum of 6 inches (152.400 mm) of material | | | without damage, between each hole. | ................................................................................. | Burned Marks, | All quantities of burned | Axial burned stripes that are | | Distortion, | marks, distortion, or louver | on more than three adjacent | | Louver Lip | lip material that is missing | louvers. Refer to the | | Material that | | applicable condition found in | | is missing, or| Bad damage that is on no more | this table for limits for | | Burned Stripes| than three adjacent louvers. | opened hole size, crack | | | This is the indication of | length, and the connection | | | the start of a burned stripe. | of cracks. | ................................................…................................ | Burned Areas, | All quantities. | | Areas where | | | Material is | NOTE: If you find a large qunatity of damage or many areas____| | missing, or a | where the material is missing, examine the turbine | | Deterioration | airfoils for damage. This is most important for the | | of the Surface| last louver. | | Layer. | | ................................................................................. | Nicks in the | All quantities. | | Surface Layer,| | | Thermal | NOTE: |
____When the surface layer is missing, the rate of the | Barrier | Combustion Chamber deterioration will increase. | | Ceramic | | | Layer that is | | | missing. | | ................................................................................. | Louver Gap | All quantities. | | Decrease and | | | and Burned | NOTE: |
____Too much of a Gap decrease will increase the rate of | Marks | downstream deterioration in the Combustion Chamber. | .................................................................................
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~............................................................................... | | TABLE 606 | ................................................................................. | | INNER AND OUTER COMBUSTION CHAMBER ASSSEMBLY (Except Bulkhead)| | | CONTINUE-IN-SERVICE LIMITS | | CONDITION ................................................................. | FOUND | PERMITTED WITH REGULAR | PERMITTED WITH DECREASED | | FIGURE 619 | TIME INSPECTION | TIME INSPECTION | ................................................................................. | Bends, | All quantities. | | Buckles, or | | | Distortion on | | | the Louvers | | ................................................................................. | Axial Cracks | All cracks that are not more | Cracks that are more than 0.75| | that are | than 0.75 inch (19.050 mm) in | inch (19.050 mm) in length, if| | only on one | length. Cracks that go fully | there is a minimum of 6.00 | | Louver | across the No. 9 louver of | inches (152.400 mm) circumfer-| | | the outer burner lining, if | entially between each one. | | | there is a minimum of 2.5 | On louver No.9 of the outer | | | inches (63.5 mm) circumferen- | burner lining, cracks that | | | tially between each one. | are more than 0.75 inch | | | | (19.050 mm) in length, if | | | | there is a minimum of 2.5 | | | | inches (63.5 mm) between each| | | | one. | ................................................…................................ | Continuous | Axial cracks which go com-| Axial cracks which go comp-| | Axial Cracks | pletely through more than one | pletely through more than | | that go | louver must be inspected with | three adjacent louvers are not| | completely | the decreased time inspection.| permitted. | | through one or................................…................................ | more louvers | If you can do an inspection of the outside diameter (OD) | | | (cold side) of the louver, and the cracks do not go through | | | the edge which overlaps the adjacent louver, the limits for | | | axial cracks that are confined to one louver are applicable. | | | If you cannot do an inspection of the OD (cold side) of the | | | louver, the limits for continuous axial cracks that go through| | | one or more louvers are applicable. | | | | | | NOTE: |
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