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 2)  A maximum service extension of 20 cycles/30 hours is permitted if the axial length is less than 0.118 inch (3 mm).
 (i)  Missing pieces 1) A maximum of 20 vanes is permitted with these condition: a) The axial length is less than 0.256 inch (6.5 mm) and the radial length is less than 0.728 inch (18.5 mm). b) The damage is not in Areas A and B.
 2)  A maximum service extension of 50 cycles/75 hours is permitted if the damage is more than the limits and no cracks start from the damage area and go into Areas A and
 B.
 (j)  Deposits and erosion - No maximum amount.
 S 096-004-C00
 (4)  
Remove the protective mats from the inlet cowl.

 (5)  
Make sure all the tools and parts are removed from the inlet cowl.

 S 866-006-C00

 (6)  
Remove the DO-NOT-CLOSE identifier and close the applicable circuit breaker on the P6-2 panel.

 S 866-005-C00
 (a)  ENG 1 START VALVE
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
(b) ENG 2 START VALVE

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
BOOSTER BLADES AND VANES - APPROVED REPAIRS
___________________________________________
 1.  General_______
 A.  The leading edge of the 1st-stage booster vanes can be repaired by
 blending, as specified in this task. The maximum blending limits are
 shown in Fig. 801. Vane assemblies with damage that is more than these
 limits must be replaced (AMM 72-31-03/401).

 TASK 72-31-03-308-001-C00
 2.  Repair the Booster Blades and Vanes___________________________________
 A.  Consumable Materials
 (1)  Abrasive cloth - silicone carbide, 150 and 180 grit size
 CP21899 or CP2191 (AMM 70-10-01/201)

 B.  References
 (1)  
AMM 70-10-01/201, Consumable Materials

 (2)  
AMM 70-40-01/201, Fluorescent-Penetrant Inspection

 (3)  
AMM 72-31-02/401, Fan Rotor Blades

 (4)  
AMM 72-31-03/401, Booster Blades and Vanes

 C.  Access
 (1)  Location Zones
 101 Control Cabin - Left
 102 Control Cabin - Right
 501 Inlet and Cowl - Left Engine
 601 Inlet and Cowl - Right Engine

 D.  Prepare for the Repair
 S 868-002-C00
 (1)  Open the applicable ENGINE START VALVE circuit breaker on the P6-2 circuit breaker panel and attach a DO-NOT-CLOSE tag.
 E.  Repair the Booster Blades and Vanes
 S 028-003-C00
 (1)  
Remove three fan blades (AMM 72-31-02/401).

 S 228-004-C00

 (2)  
Examine the dimensions and location of the defects on the leading edge.

 (a)  Compare the dimensions and location of the damage with the blending limits (Fig. 801).
 S 328-005-C00
 (3)  Do a blending repair of the damage with a soft file or a silicone carbide abrasive stone, grade C150L8V, used dry. For major blending repairs, use the silicone carbide abrasive cloth, grade 150J for prefinishing or grade 180J for finishing.
 (a)  
Do the blending repairs in a longitudinal direction parallel with the length of the vane.

 (b)  
The leading edge radius of the area you repaired must agree with the initial contour (Fig. 801).

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 72-31-03
 ALL  ú ú C01 Page 801 ú Mar 15/98
　
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