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 1) Wear sleeves that are dislodged (not attached) or that have a 4-interrupted weld design are not serviceable. 2) A service extension of a maximum of 5 cycles is permitted.
 S 216-023-C00
 (9)  Examine the HPT Nozzle Guide Vanes (Fig. 606, Fig. 606A, and Fig. 606B).
 (a)  The leading edge of the airfoil of the NGV's. 1) No maximum quantity of cracks. 2) Missing material or burned through
 a)  Missing material is permitted if for each vane if it is not more than 0.80 inch (20.3 mm) radially.
 NOTE: The dimension 0.80 inch (20.3 mm) is the
____ equivalent to 1/2 of the airfoil height.
 1.  Make sure the missing material does not extend aft
_ of the cooling hole row no. 5 and 13.
 b)  A maximum servicer extension of 25 cycles is permitted if the missing material is not more than 1.2 inch (30 mm) radially.
 NOTE: The dimension 1.2 inch (30 mm) is the
____ equivalent to 3/4 of the airfoil height.
 1.  Make sure the missing material does not extend aft
_ of the cooling hole row no. 4 and 14. 3) No maximum limit of material with burns
 (b)  Concave and convex surfaces of the NGV airfoil of the HPT 1) No maximum quantity of cracks.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
Combustion Chamber or HPT Nozzle Guide Vanes - Inspection
_________________________________________________________ 2) Missing material or burned through a) It is permitted to have one area for each airfoil if the diameter is not more than 0.25 inch (6.4 mm). b) A maximum service extension of 25 cycles is permitted if the diameter is not more than 0.50 inch (12.7 mm). 3) No maximum limit of material with burns.
 (c)  The trailing edge of the airfoil on the NGV's. 1) Axial cracks are permitted with no maximum number. 2) No maximum limit of the number of areas with buckled or
 bowled material. 3) Missing material or burned through a) The maximum area for each airfoil is 1.0 sq. inch
 (6.5 sq. cm), and the maximum area for the engine is
 4.0 sq. inch (25.8 sq. cm) b) A maximum service extension of 25 cycles is permitted.
 (d)  All airfoil surfaces on the NGV's 1) No maximum limit to the number of areas with craze cracks.
 NOTE: Craze cracks have many surface cracks with no width
____ or depth that you can see.
 2)  No maximum limit to the number of areas with nicks, marks, scratches and dents.
 3)  No maximum limit to the number of areas with metal splatter.
 4)  No maximum limit to the number of areas where the layer of Codep is missing.
 (e)  Inner and outer platforms of the NGV's, but not inner platform Area A: 1) No maximum limit to the number of cracks. 2) No maximum limit to the number of cracks in the braze
 joints of the airfoil-to-platform surfaces.
 3)  No maximum limit of material with burns.
 4)  Missing material or burned through
 a)  Missing material is permitted if the diameter is not more than 0.20 inch (5.08 mm) for each segment, and
 1.0 inch (25.4 mm) for the engine.
 b)  A maximum service extension of 25 cycles is permitted if the area is not more than 0.5 inch (12.7 mm) in diameter for each segment.
 5)  No maximum limit to the number of nicks, marks, scratches and dents on the surface of the platform. 6) No maximum limit to the number of bulges and bows.
 (f)  Inner platform of the NGV's, Area A (Fig. 606A) 1) No maximum limit to the number of cracks. 2) No maximum limit to the number of cracks in the braze
 joints of the airfoil-to-platform surfaces.
 3)  No maximum limit to the amount of burning or burn through of the inner platform or braze joint if the discourager seal is in limits.
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