Export Control
EAR Export Classification: Not subject to the EAR per 15 C.F.R. Chapter 1, Part 734.3(b)(3), except for the following Service Bulletins which are currently published as EAR Export Classification 9E991: SBE70-0992, SBE72-0483, SBE72-0580, SBE72-0588, SBE72-0640, SBE73-0209, SBE80-0024 and SBE80-0025.Copyright
© IAE International Aero Engines AG (2001, 2014 - 2021) The information contained in this document is the property of © IAE International Aero Engines AG and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of © IAE International Aero Engines AG. (This does not preclude use by engine and aircraft operators for normal instructional, maintenance or overhaul purposes.).Applicability
All
Description
TASK 72-32-00-990-501 Description and Operation of the LP Compressor/Intermediate Case Module
Description
V2500-A1: The intermediate structure fan frame is a one-piece welded structure with 10 inner and outer struts. The inner struts hold the LP compressor booster stage assembly and the components to make the front bearing compartment.
V2500-A5: The intermediate structure fan frame is a one-piece welded structure with 10 inner and outer struts. The inner struts hold the LP compressor booster stage assembly and the components to make the front bearing compartment.
The fan case is also a one-piece, welded structure. It is installed on the mounting pads on each outer strut end of the intermediate structure (fan frame) with bolts.
The case module includes a front bearing compartment where No.1, No.2 and No.3 bearing are installed. The fan rotor and the LPC rotor are held by the No.1 and No.2 bearings in position. The No.3 bearing holds the front part of the HP compressor (HPC) rotor from which the power is supplied to the PTO system. These rotors and the bearing compartment are held by an intermediate structure of the case module.
The case module also includes an internal gearbox. Torque is transmitted from the HPC through a bevel gear of the internal gearbox and a PTO shaft. The PTO shaft power output is then transmitted through an external gearbox to the engine accessories installed on the gearbox.
V2500 A1: The LP compressor booster stage has three stages (1.5, 2 and 2.5 stages) and compresses the air received from the fan.
V2500-A5: The LP compressor booster stage has four stages (1.5, 2, 2.3 and 2.5 stages) and compresses the air received from the fan.
Operation
The booster stage LPC gets compressed air from the LPC fan. The air goes through each stage of the booster LPC, where it is compressed again. The air then goes in to the HPC.
Module Sub-Assemblies
Listed below are the module build groups with the associated work groups (marked *). The work group level is where piece parts are cleaned, inspected and repaired/reworked.
SNS
Part
Location
LPC - Intermediate Structure Module Nomenclature
72-32-03
Intermediate structure
72-32-05
PTO drive shaft bearing and support
72-32-07
Oil feed distribution line
72-32-10
No.3 bearing, internal gearbox, and support assembly
72-32-16
*
Internal gearbox driven gear and housing assembly
72-32-17
*
No.2 bearing support and probe brackets
72-32-19
*
Hydraulic seal assembly
72-32-20
No.3 bearing, rotor center, and support assembly
72-32-21
*
No.3 bearing housing
72-32-22
*
No.3 bearing seal support
72-32-23
*
No.3 bearing rotor center
72-32-24
*
No.3 bearing
72-32-25
*
No.3 bearing rear seal assembly
72-32-26
*
Internal gearbox driving gear
72-32-35
Front bearing compartment rear air seal
72-32-37
Fan speed / trim balance probes harness
72-32-40
No.1 bearing support assembly
72-32-41
*
No.1 bearing support
72-32-50
LP shaft, No.1 and No.2 bearing assembly
72-32-51
*
LP stub shaft and rotor center
72-32-52
*
No.2 bearing
72-32-53
*
No.1 bearing front seal assembly
72-32-54
*
No.1 bearing
72-32-55
*
No.1 bearing front seal support
72-32-56
*
Front Bearing Compartment Front Air Seal
72-32-60
Booster stage bleed valve outlet case
72-32-70
Booster stage bleed valve and actuating mechanism
72-32-71
*
Bleed valve support and arms
72-32-72
*
Bleed valves
72-32-73
*
Bleed valve actuating ring
72-32-75
*
Bleed valve actuating rod assembly
72-32-76
LPC stage 2.5 vanes
72-32-80
LPC booster stage assembly
72-32-81
*
LPC stage 1.5 to 2.5 disk
72-32-82
*
LPC booster stage blades
72-32-83
*
LPC booster stage vanes
72-32-85
Fan case
72-32-86
Intermediate structure rear fairing
72-32-87
Fan case rear panels
72-32-88
LPC outlet guide vanes
72-32-89
Fan case front panel fairings
72-32-91
LPC Inlet guide vane assembly
72-32-93
Intermediate structure front fairing
72-32-94
PTO shaft seal tube
72-32-95
PTO shaft
72-38-11
Inlet cone
72-38-25
Bifurcation panel
Figure: V2500-A1: Sectional view of the LP compressor/intermediate case module
V2500-A1: Sectional view of the LP compressor/intermediate case module
V2500-A1: Sectional view of the LP compressor/intermediate case module
Figure: V2500-A5: Sectional view of the LP compressor/intermediate case module
V2500-A5: Sectional view of the LP compressor/intermediate case module
V2500-A5: Sectional view of the LP compressor/intermediate case module
Figure: V2500-A1: Fan speed/trim balance probes harness, No. 1 bearing comp drain tube and bleed valve act rod assembly
V2500-A1: Fan speed/trim balance probes harness, No. 1 bearing comp drain tube and bleed valve act rod assembly
Figure: V2500-A5: Sectional view of LP compressor/intermediate case module
V2500-A5: Sectional view of LP compressor/intermediate case module
V2500-A5: Sectional view of LP compressor/intermediate case module
Figure: V2500-A5: Fan speed/trim balance probes harness and bleed valve actuating rod assembly
V2500-A5: Fan speed/trim balance probes harness and bleed valve actuating rod assembly
