R R HPT Shroud Crack Limits Figure 603/TASK 72-53-00-991-302
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-------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
D. Distortion Any amount, if shroud is
not in the flowpath.
E. Burn through on Not serviceable See limit extensions
rub land (Ref. TASK 72-00-00-200-025).
Subtask 72-53-00-080-053
C. When the inspection is completed, turn off the light source, BORESCOPE -LIGHT SOURCE SET (856A1322 P02/P03/P04/P07/P08) and remove the FIBERSCOPE SET (856A1321P01/P03/P06) and GUIDE TUBE ,BORESCOPE - HPT SHROUD (856A1351G01).
Subtask 72-53-00-410-056
D. Install the spark igniters (Ref. TASK 74-21-30-400-002).
5. Close-up
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Subtask 72-53-00-410-057
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the thrust reverser doors: (Ref. TASK 78-36-00-410-040) FOR 1000EM1 451AL, 452AR FOR 1000EM2 461AL, 462AR
Subtask 72-53-00-440-053
B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041).
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C. Close Access
(1) Close the fan cowl doors: (Ref. TASK 71-13-00-410-040) FOR 1000EM1 437AL, 438AR FOR 1000EM2 447AL, 448AR
(2) Remove the access platform(s).
(3) Remove the warning notice(s).
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LPT ROTOR/STATOR ASSEMBLY - DESCRIPTION AND OPERATION
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1. General
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(Ref. Fig. 001)
A. The low pressure turbine (LPT) module is a 4-stage axial-flow turbine. It is mounted between the core engine and the turbine frame. The module consists of the following major assemblies :
(1) Stages 2-4 LPT nozzle assemblies (LPT stator assembly).
(2) LPT rotor assembly.
2. Description
___________
A. LPT Stator Assembly (Ref. Fig. 001, 002) The LPT assembly consists of the LPT case assembly, stages 2-4 LPT nozzle assemblies and the air cooling tubes and manifolds assembly. The nozzle assemblies consist of cast vane segments, and are installed inside the LPT case.
(1) The LPT case is made of nickel alloy. The case front flange is bolted to the stage 1 nozzle support ; the rear flange of the LPT case is bolted to the outer front flange of the turbine frame. The LPT shroud support is mounted radially in line with the front flange of LPT case and the stage 1 outer stationary air seal. Six thermal insulation blankets are attached to the inner surface of LPT case. Each blanket is divided into segments and is designed to accommodate either the nozzle segment vane outer platforms or the outer air seal segments. The outer air seal segments are radially in line with stages 2, 3 and 4 of the LPT rotor. At its periphery, and in the vertical plane of the stage 2 nozzle assembly, the LPT case has instrumentation ports at nine specific locations. Nine EGT (T495) thermocouples are installed in these instrumentation ports. Each of the thermocouple probes is engaged through one specific nozzle segment of the stage 2 nozzle assembly. The LPT case has three other ports located lengthwise, at the 5 o'clock position, aft looking forward. The three ports provide for the borescope inspection of the LPT internal ports.
(2) The stage 2 LPT nozzle assembly consists of 18 nickel alloy segments with aluminization. Each nozzle segment has 7 vane airfoils. The segment inner platforms are retained by the inner stationary air seals, which are the fixed part of the inner interstage rotating air seals. One of the nozzle segments has a port for borescope inspection at the 5 o'clock position (aft looking forward) and a hole to house one probe of exhaust gas temperature (EGT) harness. Eight other
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