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 E.  Cooling air for the 1st-stage low pressure turbine (LPT) nozzle vanes, HPT disk aft face and 1st- and 2nd-stage LPT disks is extracted from the 5th-stage of the HPC stator case. Four external tubes carry the air aft and duct it to the cavity surrounding the 1st-stage LPT nozzle support. After passing through the nozzles, the air flows out the inner end and enters the chamber behind the HPT disk and the chamber inside the 1st-and 2nd-stage LPT rotor disks. The air joins the primary airstream when it flows underneath the dovetails of the 1st-, 2nd- and 3rd-stage LPT blades. Cooling air for the 3rd- and 4th-stage LPT disks is taken from the HPC cavity.
 3.  Turbine Case Cooling
____________________
 A.  The LPT case is cooled by two outer cooling manifolds (Fig. 1). The manifolds are mounted between the forward and aft flanges of the LPT case and are installed around the LPT case. The parting lines between the manifold halves are at the 1:30 and 7:30 o'clock positions. Cooling air is provided by two inlet scoops, located in the thrust reverser assembly, which admit fan discharge air and duct it to the manifolds. Each manifold is made up of six steel alloy tubes provided with orifices which direct air onto the LPT case.
 4.  Engine External Accessories Cooling
___________________________________
 A.  Engine external accessories cooling consists of cooling air provisions for the generator and the ignition leads.
 5.  High Pressure Turbine Clearance Control System
______________________________________________
 A.  The HPT clearance control system uses cooling air from the HPC 5th- and 9th- stages to optimize HPT blade clearance. Airflow selection is regulated according to engine operating conditions.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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 ////////////////////////
SEE A
SEE B
AIR INLET SCOOP
FAN DUCT COWL ON THE LEFT SIDE
A

LPT Cooling Air Inlet Scoops Figure 1 (Sheet 1)
E82532
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
AIR INLET SCOOP
FAN DUCT COWL ON THE RIGHT SIDE
B

LPT Cooling Air Inlet Scoops
Figure 1 (Sheet 2)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E82535
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
ENGINE EXTERNAL ACCESSORIES COOLING - DESCRIPTION AND OPERATION
_______________________________________________________________
 1.  General
_______
 A.  Engine external accessories cooling consists of generator cooling and ignition leads cooling.
 2.  Generator Cooling (Fig. 1)
_________________
 A.  The generator is cooled by low pressure fan discharge air extracted from an engine port on the fan frame at the 5 o'clock position. Cooling air is ducted from the engine port, around the bottom of the fan frame, and to the generator cooling air inlet duct. The air flows into the aft end bearing and is circulated inside to cool the stator and rotor. Part of the cooling air passes through flutes in the rotor, then impinges on the drive end bearing. The cooling air leaves through the openings around the generator housing, passes through the exhaust duct, and is exhausted overboard through the generator cooling air exhaust port in the left fan cowl panel.
 3.  Ignition Leads Cooling (Fig. 2)
______________________
 A.  Cooling air for the left and right ignition leads is tapped from low pressure compressor (booster) discharge air. Booster air is fed to a cooling air tube mounted to the fan frame mid shroud at the 3 o'clock position. The tube is routed to the 3 o'clock strut support bracket and is connected to a fitting, which ducts cooling air under the braided conduit around each lead. The air is exhausted onto the igniters through the cooling air shroud.
　
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