72-42-00
ALL ú ú C01 Page 1 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
SECONDARY
SWIRL NOZZLE
DOME
OUTER
LINER VENTURI
COOLING
HOLES
DOME
COWL INNER LINER INNER
INNER
SUPPORT
FLANGE
COWL OUTER (2 LOCATIONS) IGNITER FERRULE
G-M56-MM-0065(1)-02-B
Figure 1 Combustion Chamber Location
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72-42-00
ALL ú ú C01 Page 2 ú Feb 25/85
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
HIGH PRESSURE TURBINE NOZZLE - DESCRIPTION AND OPERATION
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1. General
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A. The high pressure turbine (HPT) nozzle is a single-stage, air cooled assembly that mounts in the combustion case and directs the gas flow from the combustion chamber onto the blades of the HPT rotor at the optimum angle (Fig. 1). The major components of the nozzle are the 23 nozzle segments, outer support, and inner support. The aft support and seal assembly, and the aft stator seals, while not integral components of the HPT nozzle module, are included since they attach to the HPT stator.
2. Nozzle Segments
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A. Each HPT nozzle segment is made up of two vanes brazed into inner and outer platforms. Each vane is a cast shell divided into forward and aft compartments by an inner rib. The vanes and bands are cooled by compressor discharge air entering the vane compartments through inserts in the inner and outer ends of vanes and exiting through the vane leading and trailing edges. The vanes and platforms are made of high strength cobalt base alloy with a protective coating on vane airfoils and platform flowpath surfaces.
3. Inner and Outer Supports
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A. The nozzle inner and outer supports are both one-piece, nickle base alloy rings. The major portion of the nozzle axial load is carried by the inner support through the bolted flanges of the support and nozzle inner platforms. The outer support carries a minor portion of the load.
4. Aft Outer Support and Seal
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A. The aft outer support is a one-piece, nickel base alloy ring that provides support for the four step honecomb seal. The honeycomb seal mates with the HPT rotor inducer seal to help maintain the proper amount of cooling air flow and rotor thrust.
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