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 Borescope Inspection of the Stage 4 Booster Blades Figure 604/TASK 72-21-00-991-310
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 Booster Rotor Blades Damage Inspection (All stages) Figure 605/TASK 72-21-00-991-313
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 (1) Connect the BORESCOPE - LIGHT SOURCE SET (856A1322P02/P03/P04/P07/P08) to a grounded power supply.

 (a) Connect the fiber light cable to the BORESCOPE KIT (856A1320P04/P05) and to the port on the BORESCOPE - LIGHT SOURCE SET (856A1322P02/P03/P04/P07/P08).

 (b) Turn the light source on. Engage the borescope and the long right-angle extension, and set it as necessary for inspection.

 Subtask 72-21-00-290-054
 C. Borescope Inspection of the booster blades.
 WARNING : USE CARE TO AVOID PERSONAL INJURY WHEN YOU MANUALLY TURN THE
_______ FAN ROTOR. ASSURE SAFE FOOTING.USE HEAVY PROTECTIVE GLOVES
 (1) Do an borescope inspection of the booster blades while you turn the fan rotor clockwise (aft looking forward) to complete the procedure.
 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Booster rotor blades (all stages) for:
 A. Missing piece on  Axial or radial depth
 tip corner 0.25 in. (6.35 mm) max.

 B. Cracks  Not serviceable
 C. Wear or local  Axial depth 0.5 in.
 deformation (blade (12.7 mm) and 0.8 in.
 tip corner on (20.32 mm) radial max.
 leading and/or
 trailing edges

 D. Nicks, dents on  No limited quantity if
 concave and/or not deeper than 0.01 in.
 convex sides (0.25 mm)
 located in area E

 E. Nicks, dents on  No limited quantity if
 concave and/or not deeper than 0.04 in.

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 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS
 -------------------------------------------------------------------------------convex sides not (1.02 mm) located in area E
 F. Nicks, dents, on  Axial depth 0.02 in.
 leading and/or mex (0.5 mm) max.
 trailing edges

 NOTE : If any damage is found, do a borescope inspection of all booster
____
 downstream stages and compressor.

 G. Distorted leading  Circumferential
 and/or trailing displacement 0.2 in. (5
 edges not located mm) maximum
 in area E

 NOTE : Whenever
____ serviceable limits for the following are exceeded, refer to the over-serviceable limit extension if necessary (Ref. TASK 72-00-00-200-025).
 (2) When the inspection is completed, turn the switch off. Leave the main light source blower on for a while to cool the lamp and the housing.
 5. Close-up
________
 Subtask 72-21-00-410-061
 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

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 (3) Remove the access platform(s).

 Subtask 72-21-00-440-052
 B. Make the thrust reverser serviceable (Ref. TASK 78-30-00-081-041).
 Subtask 72-21-00-410-062
 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 warning notice(s).

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 TASK 72-21-00-210-009
 Inspect Fan Rotor Blades Installed on the Fan Disk
 1. Reason for the Job
__________________
 Self Explanatory
 2. Job Set-up Information
______________________
 A. Fixtures, Tools, Test and Support Equipment
　
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