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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Combustion Chamber or HPT Nozzle Guide Vanes - Inspection
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(e) Holes that are burned through or missing material.
1) Eleven areas total for both liners are permitted if they are in these limits: a) Three or more adjacent holes are not aligned in the
axial direction.
b) One hole diameter is not greater than 3 times the diameter of the nearest dilution hole.
c) Four holes are not greater than 2 times the diameter of the nearest dilution hole.
d) Six holes are not greater than 1 time the size of the nearest dilution hole.
e) If a dilution hole is contained in the damaged area, consider only the additional area created.
2) One burned through area up to 4 times the diameter of the nearest dilution hole is permitted if other holes are in these limits: a) Three or more adjacent holes are not aligned in the
axial direction.
b) Three holes are not greater than 2 times the diameter of the nearest dilution hole.
c) Three holes are not greater than 1 time the size of the
nearest dilution hole.
d) Seven areas total for both liners.
e) If a dilution hole is contained in the damaged area,
consider only the additional area created.
3) A maximum service extension of 100 cycles is permitted if all these conditions are met: a) No more than 8 holes are greater than 2 times the
diameter of the nearest dilution hole.
b) No more than 2 holes are greater than 3 times the diameter of the nearest dilution hole.
c) No more than 1 hole is greater than 4 times the diameter of the nearest dilution hole.
d) The maximum axial alignment is adjacent 3 panels if they have a separation of a minimum of 3 dilution lands that are not damaged.
(f) Missing overhangs
1) Fourteen areas for each liner if each area is not more than 2 times the size of the dilution hole and they are not axially aligned across 3 or more adjacent panels.
2) A maximum service extension of 25 cycles is permitted with a maximum of 17 areas for each liner if each area is not more than 2 times the size of the dilution hole and they are not axially aligned across 4 or more adjacent panels.
(g) Distortion
1) All distortions are permitted if each is not distorted more than 0.5 inch (13 mm) from the initial contour.
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ú ú ú C01.101 ú BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details. Page 641Jul 12/02
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Combustion Chamber or HPT Nozzle Guide Vanes - Inspection
_________________________________________________________
2) A maximum service extension of 25 cycles is permitted if the distortion is not more than 0.7 inch (18 mm) from the initial contour.
S 216-114-C00
(8) Fuel Nozzles
(a)
Check fuel nozzle tip for carbon or wear. 1) If carbon is visible, check for damage to hardware aft of the nozzle; examine the fuel nozzle tip for carbon or wear.
2) Remove fuel nozzle and perform detailed inspection if wear or carbon is present (AMM 73-11-04/401, AMM 73-11-04/601).
(b)
Check the fuel nozzles for dislodged (not attached) wear sleeves or wear sleeves with a 4-interrupted weld design.
NOTE: On some fuel nozzle assemblies, the wear sleeve does
____ not have a continuous weld to attach it to the fuel nozzle. Such fuel nozzle wear sleeves have four individual weld spots. This is a 4-interrupted weld design.
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