__________ Subtask 72-23-00-941-091
 A. Safety Precautions
 (1) On the center pedestal, on the ENG panel 115VU:

 (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 72-23-00-010-113
 B. Get Access
 (1) Put an access platform in position at the front of the engine.

 (2) Remove the spinner front cone (Ref. TASK 72-21-00-000-005).

 (3) Remove the spinner rear cone (Ref. TASK 72-21-00-000-006).

 (4) Put temporary mark on each fan blade from 1 to 36.

 (5) Remove 3 consecutive fan blades (Ref. TASK 72-21-00-000-007). To compensate for imbalance caused by the removal of 3 blades, it is recommended to remove 3 blades 180 degrees opposite to those removed before.

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 4. Procedure
_________
R (Ref. Fig. 609/TASK 72-23-00-991-311)
 Subtask 72-23-00-350-059
 A. Inspection of Mid Acoustical Panels
 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Leading edge  Not serviceable  Replace panel (Ref. TASK
 delamination  72-23-00-000-025) and
 (Ref. TASK 72-23-00-400-
025)
 2. Inner skin  20 percent of acoustical  Above 20 percent, replace
 delamination in  area  panel (Ref. TASK 72-23-00-
acoustical area  000-025) and (Ref. TASK
 72-23-00-400-025)
 3. Mid acoustical panel
 cups
 A. Dents, marks,  No limits
 indentations
 caused by screw
 head
 B. Pierced cups  No limits  (Ref. TASK 72-23-00-400-
caused by screw  044)
 head
 C. Unbonded cups  Not serviceable  (Ref. TASK 72-23-00-300-
044)
 D. Missing cups.  Not serviceable  (Ref. TASK 72-23-00-300-
044)
 4. Missing panel  Not serviceable
 5. Loose bolts  Not serviceable  Tighten bolts

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 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
6. Subsurface linear impressions or wrinkles

 7. Voids

8. Defects in the protective coating (initial Tedlar film, or paint) such as:

 A. Missing
B. Defects (dents, nicks, tears, flaking) that let show the inner skin

 9. Inner skin defects, such as:

 A. Superficial defects (dents, nicks, tears, impact marks) not through the skin
 B. Defects (tears, cracks, punctures) through the skin No limits
Five per panel, 2 in.
(50.8 mm) apart, 0.12 in. (3 mm) Dia max,
 0.012 in. (0.3 mm) max depth
No limits
No limits
No limits with a total surface area less than 4 square in. (2580 sq mm)per panel
Not serviceable
Serviceable criteria
applied on new parts

Serviceable criteria
applied on new parts

Remove the loose material
 with a sharp blade

Remove the loose material
with a sharp blade

Remove the loose material
with a sharp blade

Replace panel(s)
(Ref. TASK 72-23-00-000-025) and (Ref. TASK 72-23-00-400-025)

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________ Subtask 72-23-00-410-104
 A. Close Access
 (1) Install the fan rotor blades at the locations recorded at the removal (Ref. TASK 72-21-00-400-007).

 (2) Install the spinner rear cone (Ref. TASK 72-21-00-400-006).

 (3) Install the spinner front cone (Ref. TASK 72-21-00-400-005).

 (4) Make sure that the work area is clean and clear of tool(s) and other items.
　
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