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72-31-05
ALL ú ú N01 Page 604 ú Feb 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
1.6TH-STAGE BLADE - REPAIRS
___________________________
1. General
_______
A. This procedure gives the steps for the blend reapir of the 1.6th-stage blades.
B. The 1.6th-stage blades are immediately aft of the 1st-stage stator of the low pressure compressor (LPC). n the
C. To get access to the 1.6th-stage blades, you must remove the inlet cone, the fan blades, and the stator assembly.
TASK 72-31-05-308-001-N00
2. Repair the 1.6th-Stage Blades
_____________________________
A. General
(1)
You will blend the edges or surfaces of the 1.6 stage blades to do the repair. You can blend the blades with a high quality file, an abrasive cloth, or an abrasive stone. You can blend with a slow speed power tool if you must remove a large quantity of material.
B.
Standard Tools and Equipment
(1)
File - for blend repair
(2)
Stone - Fine, for blend repair and finishing
(3)
Protective Mat-Rubber Manufacturer's Association, Grade SC43 neoprene sponge, 1-inch thick, approximately 5x6 feet with warning streamer attached (3 are necessary).
C.
References
(1)
AMM 70-31-01/201, Fluorescent Penetrant Inspection
(2)
AMM 72-31-01/401, Inlet Cone
(3)
AMM 72-31-02/401, 1st-Stage Fan Blades
(4)
AMM 72-31-04/401, 1st-Stage Stator
(5)
IPC 72-31-05 Fig. 1
D.
Access
(1)
Location Zone
412 Engine 1 - LPC
422 Engine 2 - LPC
432 Engine 3 - LPC
442 Engine 4 - LPC
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72-31-05
ALL ú ú N01 Page 801 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES /MAINTENANCE MANUAL ////////////////////////
FAN EXIT FAIRING
L-A0909
A-A
MINIMUM DISTANCE BETWEEN BLEND REPAIRS ON OPPOSITE EDGES MUST NOT BE LESS THAN THE AVERAGE BLADE WIDTHL-A0616
MINIMUM DISTANCE BETWEEN BLEND REPAIRS
LEADING EDGE
APPROXIMATE
AREAS C AND E
AREAS C AND E
DEPTH DIMENSION
B-B
BLEND REPAIR EDGE DAMAGE
AREA B AREA D
AREA
AREA C L-A0910 1.6th-Stage Blade Inspection Figure 801
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72-31-05
ALL ú ú N01 Page 802 ú Feb 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
E. Prepare for the Procedure
S 498-004-N00
CAUTION: MAKE SURE THAT YOU PUT COVERS ON ALL OF THE LOWER INNER SURFACE
_______ OF THE INLET COWL. ALSO MAKE SURE THAT THE EDGES OF THE MATS TOUCH OR ARE ATTACHED WITH SOME TAPE. IF THE EDGES ARE NOT TOGETHER, THE TOOLS OR PARTS CAN FALL AND CAUSE DAMAGE TO THE INLET COWL SURFACE.
(1)
Put the protective mats on the lower inner surface of the inlet cowl.
S 018-005-N00
(2)
Remove the inlet cone (AMM 72-31-01/401).
S 018-006-N00
(3)
Remove all of the 1st-stage fan blades (AMM 72-31-02/401).
S 018-007-N00
(4)
Remove the 1st-stage stator (AMM 72-31-04/401).
F.
Procedure
S 328-008-N00
CAUTION: IF YOU USE A POWER TOOL TO BLEND, MAKE SURE THERE IS NOT TOO
_______ MUCH HEAT. DAMAGE TO THE BLADE CAN OCCUR IF THERE IS TOO MUCH HEAT ON THE BLADE.
(1) Use a fine file, an abrasive cloth, or an abrasive stone to do the blend repair.
NOTE: If the damage is very large or has a large depth, use a slow
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