(a) Put a warning notice to tell persons not to start the engine.

 (2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.

 (3) On the overhead maintenance panel 50VU:

 (a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

 (b) Put a warning notice to tell persons not to energize the FADEC 1(2).

 Subtask 72-53-00-010-056
 B. Get Access
 (1) Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

 (2) Put the access platform in position.

 Subtask 72-53-00-040-053
 C. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041).
 Subtask 72-53-00-010-059
 D. Open the thrust reverser doors: (Ref. TASK 78-36-00-010-040)
 FOR 1000EM1
 451AL, 452AR
 FOR 1000EM2
 461AL, 462AR

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 4. Procedure
_________
 (Ref. Fig. 601/TASK 72-53-00-991-300)
 Subtask 72-53-00-010-057
 A. Remove the spark igniters (Ref. TASK 74-21-30-000-002).
 (1) Install the protective caps on the leads and the spark igniters.
 Subtask 72-53-00-290-053
 B. Do a borescope inspection:
 CAUTION : FOLLOW THE INSTRUCTIONS CAREFULLY FOR INSERTING OR REMOVING THE
_______ FLEXIBLE BORESCOPE. DOING THE PROCEDURE INCORRECTLY WILL DAMAGE THE TIP CONTROL FUNCTION.
R (1) Put the GUIDE TUBE ,BORESCOPE - HPT SHROUD (856A1310G01), over the straightening rod.
 (2) Push the plastic guide tube and straightening rod into the combustion chamber as far as it will go.

 (3) Turn the pointed tab on the plastic guide tube to the rear of the engine and remove the straightening rod from the plastic guide tube.

 (4) Connect the FIBERSCOPE SET (856A1321P01/P03/P06), and to the port on the BORESCOPE - LIGHT SOURCE SET (856A1322P02/P03/P04/P07/P08).

 NOTE : Use the MONITOR, RESOLUTION BORESCOPE (856A1323G01) to make
____ R sure borescope and the light source are serviceable. See the R Non Destructive Test Manual for this procedure (Ref. NDTM
 720000).
 (5) Align the borescope lens with one of the plastic tabs on the guide tube and install it into the tube. Make sure that the borescope tip is not moved up or down when putting it into the plastic guide tube.

 (6) Push the borescope through the plastic guide tube until the tip comes out of the end of the tube.

 (7) Push the tip of the borescope between the nozzle vanes by using the tip deflection control.

 (8) Turn on the light source of BORESCOPE - LIGHT SOURCE SET (856A1322P02/P03/P04/P07/P08).

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 (9) Adjust the borescope equipment to obtain maximum clarity of view.
 (10) Inspect the HPT Shrouds:
 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. HPT shrouds for: 
R  A. Cracks  Surface cracks permitted 
R  (Ref. Fig.
 603/TASK 72-53-00-
991-302) 
R  any number and any 
R  lenght axially across 
R  width in Surface A and B 
R 
R  Any number of 
R  circumferential cracks 
R  that are not connected 
R  and are no more than 1 
R  in. (25.3999 mm) long in 
R  Surface B 
R  Circumferential cracks 
R  that are connected to 
R  axial cracks cannot be 
R  over 0.25 in. (6.3499 
R  mm) long and not less 
R  than 0.25 in. (6.3499 
R  mm) from the shroud edge 
R  Surface A
 B. Burning/erosion  Any amount of material
 which is not there.
 (This include holes
 through the backstrip).
 Remaining material is
 not permitted to be in
 the flowpath.
 C. Rubs/wear  Any amount

See limit extensions
(Ref. TASK 72-00-00-200-025).
　
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