Low Pressure Turbine Rotor/Stator Assembly
Figure 001
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Low Pressure Turbine Rotor/Stator Assembly
Figure 002
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E E nozzle segments also have one hole to accommodate one probe of the EGT harness.
(3) The stage 3 LPT nozzle assembly consists of 20 nickel alloy segments of 6 vane airfoils each and is similar in design to the stage 2 nozzle assembly. One of the vane segments has a port for borescope inspection at the 5 o'clock position (aft looking FWD).
(4) The stage 4 LPT nozzle assembly consists of 22 nickel alloy segments of 6 vanes each and is similar in design to the stage 2 nozzle assembly. One of the nozzle segments has a port for borescope inspection at the 5 o'clock position (aft looking FWD).
(5) The LPT cooling system consists of 2 air cooling manifolds made of steel alloy and 2 tube halves made of steel alloy. Each manifold and tube half assembly is made up of 6 tubes provided with orifices which direct the air toward the LPT case.
B. LPT Rotor Assembly
(Ref. Fig. 003)
(1) LPT disks are made of nickel alloy. The disk front flanges accommodate the blade retainer which provides axial retention of each blade stage assembly. They also retain the rotating air seals which control air passage between LPT nozzle assembly and rotor. The outer rim of disks has machined recesses accommodating the blade dovetails.
(2) The stage 1 blade assembly consists of 162 tip-shrouded, nickel alloy blades with aluminization, equipped with antiwear shields. The front of the blade dovetails has a retaining lug which houses a blade retainer. Blade retainer is held axially by the rotating air seal.
(3) The rotating air seals are made of nickel alloy. They are sandwich-mounted between stages 1, 2, 3 and 4 disks. They control air passage between the stator and the rotor.
(4) Stages 2-4 of the LPT rotor are similar except for the following differences. Stages 2-3 LPT disks have 150 blades, equipped with antiwear shields, stage 4 LPT disk has 134 blades. The turbine rotor support is sandwich-mounted between the stage 3 rotating air seal and the stage 3 disk.
(5) The turbine rotor support, made of nickel alloy, provides connection between the assembly of disks and the LPT shaft. It divides the LPT rotor inner enclosure into 2 separate cavities.
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Low Pressure Turbine Rotor Assembly
Figure 003
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LPT ROTOR/STATOR ASSEMBLY - INSPECTION/CHECK
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TASK 72-54-00-290-005
Inspection of the Stage 1-3 Blades
1. Reason for the Job
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Self Explanatory
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific warning notice
No specific Torque Wrench : range 36.00 to 220.00 lbf.in
(0.40 to 2.60 m.daN)
856A1320 1 BORESCOPE KIT
856A1322 1 BORESCOPE - LIGHT SOURCE SET
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2101 USA MIL-T-5544
graphite grease (Ref. 70-30-00) R Material No. CP2619 * R Never Seez-Pure Nickel, Special (Ref. 70-30-00)
Material No. CP8001 * lockwire 0.032 in. (0.8 mm) dia. (Ref. 70-30-00) Material No. CP8002 * lockwire 0.032 in. (0.8 mm) dia. (Ref. 70-30-00)
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C. Referenced Information
