run axially and do not grow longer circumferentially.
 J. Cracks in inner or For NON /P engines. See limit extensions
 outer platform.  Any number no longer (Ref. TASK 72-00-00-200-than 0.59 in. (15 mm). 025). For /P engines. Three cracks per segment not to exceed 0.59 in. (15 mm) long and Metal does not go into the gaspath.
 K. Craze cracking Any amount
 NOTE : Craze cracking is defined as numerous superficial surface
____ cracks which have no visual width or depth.
 (4) If defects are found, look at the HPT shrouds (Ref. TASK 72-53-00-290-004).
 Subtask 72-53-00-080-052
 C. When the inspection is complete, turn off the light source BORESCOPE -LIGHT SOURCE SET (856A1322P02/ P03/P04/P07/P08), and remove the rigid borescope, BORESCOPE KIT (856A1320P04/P05).
 Subtask 72-53-00-420-051
 D. Install parts removed for borescope inspection.
 (1) Apply a small amount of graphite grease (Material No. CP2101) or Never Seez-Pure Nickel, Special (Material No. CP2619) to the borescope plug threads and pressure faces.
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 (2) Install the borescope plugs and TORQUE to between 57 and 63 lbf.in

 (0.64 and 0.71 m.daN).

 (3) Wirelock the plugs with lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8001) or lockwire 0.032 in. (0.8 mm) dia. (Material No. CP8002).

 5. Close-up
________ Subtask 72-53-00-410-055
 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 72-53-00-440-052
 B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041). Subtask 72-53-00-410-058
 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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 TASK 72-53-00-290-004
 Borescope/Inspection of the High-Pressure Turbine Shroud
 1. Reason for the Job
__________________
 Inspection of the high pressure turbine (HPT) shrouds is limited to the areas that can be seen with a flexible borescope, at the spark igniter ports.
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
 -------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
 -------------------------------------------------------------------------------
No specific protective caps
 No specific warning notice
 No specific access platform 1 m (3 ft. 3 in.)
 856A1321 1 FIBERSCOPE SET
 856A1322 1 BORESCOPE - LIGHT SOURCE SET
 856A1323 1 MONITOR, RESOLUTION BORESCOPE
 856A1351 1 GUIDE TUBE ,BORESCOPE - HPT SHROUD

 B. 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
 74-21-30-000-002 Removal of the Spark Igniter
 74-21-30-400-002 Installation of the Spark Igniter
 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 720000
 72-53-00-991-300 Fig. 601

R 72-53-00-991-302 Fig. 603
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 3. Job Set-up
__________
 Subtask 72-53-00-941-053
　
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