(2) The LPT shaft module consists of the following major parts :
(a) LPT shaft.
(b) No. 4 roller bearing.
(c) No. 5 roller bearing.
2. Description
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(Ref. Fig. 002, 003)
A. Low pressure Turbine Shaft
(1) The LPT shaft is made of steel alloy. It is located concentrically in the high pressure rotor system. Its forward end is provided with outer splines for coupling with the fan shaft. It is axially retained by a shoulder and a coupling nut. At the aft end of the shaft, the No. 4 and 5 bearings are located axially on both sides of an integral hub. On the rear face, the hub supports 2 rotating air/oil seals which control the air circulation through the LPT rotor and the sump pressurizing air. On the front face, the hub supports the turbine rotor support.
(2) The center vent tube is made of composite material. It is installed inside the LPT shaft. Its forward end is inserted in the LPT shaft plug and its aft end is supported by the LPT shaft hub. It is maintained coaxial in the LPT shaft through 2 inner locating diameters: one at the front end of the LPT shaft; the other at the rear end of the shaft.
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Low Pressure Turbine Shaft Assembly
Figure 001
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Low Pressure Turbine Shaft Assembly
Figure 002
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No. 4 and No. 5 Bearing Lubrication
Figure 003
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(3) The center vent tube rear extension duct is installed at the aft end of the center vent tube. Its relative angular position is maintained by locating pins, and axial retention is provided by an inner nut threaded into the center vent tube. A centrifugal air/oil separator is retained by a nut against a central shoulder on the duct. Its relative angular position is maintained by slots at its front end.
B. No. 4 Bearing The no. 4 bearing, which takes the high pressure turbine (HPT) rotor radial loads, is a roller bearing installed between the HPT rear shaft and the LPT shaft. The bearing outer race is housed in the HPT rear shaft bore, and its inner race is bolted to the front face of the LPT shaft integral hub. The inner race has a shoulder which would act as an emergency bearing in case of roller failure. The inner race front end is provided with a sump air seal.
C. No. 5 Bearing The No. 5 Bearing supports the LPT rotor aft end inside the turbine frame and takes the radial loads. The bearing outer race is mounted in the turbine frame and its inner race is mounted at the rear of the LPT shaft integral hub. Axial retention is provided by a retainer nut. Retainer nut relative position is maintained by rivet.
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TASK 72-55-00-960-002
Replacement of LPT Shaft Plug O-rings
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
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No specific scriber No specific warning notice 856A2632 1 PULLER 856A2668 1 TBD
B. Consumable Materials
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Material No. CP2442 * engine oil (Ref. 70-30-00)
C. Referenced Information
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72-21-00-000-005 Removal of the Spinner Front Cone 72-21-00-000-006 Removal of the Spinner Rear Cone 72-21-00-400-005 Installation of the Spinner Front Cone 72-21-00-400-006 Installation of the Spinner Rear Cone 72-55-00-991-301 Fig. 201
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