1) There is no limit to the maximum quantity if there is no missing material.
(d)
A maximum service extension of 25 cycles is permitted for material that is melted or missing, or for cracks or burns that are through the vanes.
S 216-086-C00
(3)
Nicks, marks, scratches or dents in the concave or convex surfaces and the leading or trailing edges are permitted with no limits.
S 216-087-C00
(4)
Examine the inner or outer platform for cracks:
(a)
Two cracks are permitted for each segment if they are less than
0.5 inch (12.7 mm) in length and no metal goes in the gaspath.
(b)
A maximum service extension of 3 cycles is permitted if the cracks are less than 1.0 inch (25.4 mm) in length and are not found in more than 2 adjacent segments.
S 916-101-C00
(5)
Adjust the rigid borescope in the S17 port to see the HPT shrouds.
S 216-102-C00
(6)
Examine the HPT shrouds for these conditions (Fig. 607):
(a) Cracks 1) No maximum limit to the number of cracks on the surface. 2) No maximum number and length of axial cracks that do not
connect.
3) Three circumferential cracks for each segment are permitted if they are less than 0.4 inch (10 mm) in length and have a minimum separation of 0.5 inch (13 mm).
4) A maximum service extension of 10 cycles is permitted if cracks are connected or extend across the axial width of the shroud.
(b) Material with burns and erosion
1) There is no limit to the maximum quantity if there are no holes through the shroud and no material that extends in the gaspath.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
HPT Blades and Shrouds and 1st-Stage LPT NGV's - Inspection
___________________________________________________________ 2) A maximum service extension of 50 cycles is permitted if the damage is not in the limits.
(c)
No maximum limit to the quantity of material with rub and wear.
(d)
Material with distortion 1) There is no maximum limit to the quantity if the shroud does not extend in the gaspath.
2) A maximum service extension of 50 cycles is permitted if the damage is not in the limits.
S 216-146-C00
(7) Examine the space between the aft end of the HPT shroud and the forward end of the 1st Stage LPT NGV outer platform and look for the conditions that follow (Fig. 607):
(a) HPT aft stator seals that extend into the gas path.
NOTE: The HPT aft stator seals are approximately 0.01
____ inch (0.25 mm) thick material.
1) There is no limit to the maximum quantity if the HPT blade trailing edge wear does not extend into the tip cap and no HPT shrouds extend into the gas path.
2) A maximum service extension of 25 cycles is permitted if the damage is not in the limits.
(b) Retainer or retainer segments that extend into the gas path.
NOTE: The retainer or retainer segments are approximately
____
0.08 inch (2.03 mm) thick material.
1) This condition is not serviceable.
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本文链接地址：737-300 400 500 AMM 飞机维护手册 ENGINE 发动机 1(36)
