2. Description
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A. HPT shroud and stage 1 LPT nozzle assembly The HPT shroud and stage 1 LPT nozzle assembly consists of the shroud/nozzle support and HPT shrouds, and the stage 1 nozzles, inner air seal, and stationary air seal.
(1) The shroud/nozzle support forms the outer shell of the assembly and provides an air space or manifold area between the outer shell and the combustion case. High pressure compressor (HPC) bleed air is introduced into the manifold area to provide cooling for the HPT shrouds and the LPT nozzles.
(2) The HPT shrouds have a smooth abrasive rub surface that is tolerant to localized blade tip rubs and has good resistance to erosion from hot exhaust gases. The shrouds are held in place on the support by retainers and are individually replaceable.
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HPT Shroud and Stage 1 LPT Nozzle Assembly
Figure 001
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(3) The assembly has 28 LPT nozzle segments, each having 3 vanes. The nozzle segments are installed in the shroud/nozzle support and are held in place on the nozzle inner air seal by the stationary air seal which is bolted on the aft face of the inner air seal. The assembly is bolted between the LPT case forward flange and the combustion case aft flange. Borescope ports at 5.30 and 8.30 o'clock positions (ALF) are provided in the support to allow inspection of the nozzle area.
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E 56-5B E E E HPT SHROUD AND STAGE 1 LPT NOZZLE ASSEMBLY - INSPECTION/CHECK
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TASK 72-53-00-290-003
Borescope/Inspection of the Stage 1 Low-Pressure Turbine Nozzle Assembly
1. Reason for the Job
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R Inspection of the low pressure turbine (LPT) nozzle is limited to the areas R that can be seen with a rigid borescope. Insert the borescope through the R borescope ports located on stage 1 LPT nozzle support. If no defects are R found then the borescope inspection is complete. If defects are found then R look at the high-pressure turbine (HPT) shrouds.
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific warning notice
No specific access platform 1 m (3 ft. 3 in.)
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
856A1323 1 MONITOR, RESOLUTION BORESCOPE
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2101 USA MIL-T-5544 graphite grease (Ref. 70-30-00) Material No. CP2619 * 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
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-13-00-010-040 Opening of the Fan Cowl Doors 71-13-00-410-040 Closing of the Fan Cowl Doors 72-00-00-200-025 Over-Serviceable-Limit Extensions 72-53-00-290-004 Borescope/Inspection of the High-Pressure Turbine
Shroud 78-30-00-081-041 Make the Thrust Reverser Serviceable after Maintenance 78-30-00-481-041 Make the Thrust Reverser Unserviceable for
Maintenance 78-36-00-010-040 Opening of the Thrust Reverser Doors 78-36-00-410-040 Closing of the Thrust Reverser Doors NDTM 72-00-00 72-53-00-991-300 Fig. 601 72-53-00-991-301 Fig. 602
3. Job Set-up
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Subtask 72-53-00-941-052
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
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