747-400 AMM 飞机维护手册 发动机 ENGINE 2(11)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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 (6)  Make the surface of the repair area smooth, with a level that is not more than 0.015 inch (0.381 mm) higher than the adjacent surfaces.
 NOTE: If the repair is in area B, it is not necessary to repair the
____
 grooves.

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 (7)  If you removed the 1st-stage fan blades, install them (AMM 72-31-02/401).
 TASK 72-33-01-308-009-N00
 3. Repair of Cracks in the Duct Segment
____________________________________
 A. Consumable Materials
 (1)  
G00000 Tape - Magic Mending

 (2)  
G00842 Cheesecloth - Unsized

 (3)  
A00000 Compound - Potting (PWA 603)

 (4)  
B00148 - Solvent, Methyl Ethyl Ketone (MEK) (PMC 1820)

 (5)  
B00143 - Solvent, Trichlorotriflourothane (PMC 9087)

 B.
References

 (1)  
AMM 72-31-02/401, 1st-Stage Fane Blades

 C.
Access

 (1)  
Location Zone
 412 Engine 1 - Front Fan Case
 422 Engine 2 - Front Fan Case
 432 Engine 3 - Front Fan Case
 442 Engine 4 - Front Fan Case

 (2)  
Access Panel
 413 and 414 Fan Cowl Panels - Engine 1
 423 and 424 Fan Cowl Panels - Engine 2
 433 and 434 Fan Cowl Panels - Engine 3
 443 and 444 Fan Cowl Panels - Engine 4

 D.
Repair the Cracks in a Duct Segment.

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 (1)  
If you cannot get acces to the damage, remove the 1st-stage fan blades (AMM 72-31-02/401).

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 (2)  
Refer to the limits in Table 802 and Figure 802 when you repair the surface.

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 72-33-01
 ALL  ú ú N01 Page 805 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
~............................................................................... | Table 802 | | Crack Repair Limits | ................................................................................. | Type of Damage | Area A | Area B | Area C | ................................................................................. |1) Crack Width | 0.125 inches | 0.125 inches | 0.125 inches | | on Each Segment |(3.175 mm) maximum |(3.175 mm) maximum |(3.175 mm) maximum | ................................................................................. |2) Height | level, 0.015 inch | level, 0.015 inch | level, 0.015 inch | | of Compound |(0.381 mm) maximum |(0.381 mm) maximum |(0.381 mm) maximum | ................................................................................. |3) Depth of | 0.100 inches | 0.100 inches | 0.100 inches | | Material Removed |(2.540 mm) maximum |(2.540 mm) maximum |(2.540 mm) maximum | ................................................................................. |4)Total Arc Length,| 6 inches | 6 inches | 6 inches | | on Each Segment |(152.4 mm) maximum |(152.4 mm) maximum |(152.4 mm) maximum | | ............................................................. | Total Arc Length,| | 15 inches | | | on All Segments | |(381.0 mm) maximum | | .................................................................................
 |5) Circumferential |  |  12 inches  |  |
 |separation between |  |  (304.8 mm)  |  |
 |  incidents  |  |  minimum  |  |

 ................................................................................. |6) The Retention | | | cannot be | | Pin is Visible | | | repaired | 2...................…...................…...................…...................1
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 CAUTION: MAKE SURE THAT THE CUTTING TOOL ONLY TOUCHES THE AREA THAT YOU
_______ WILL REMOVE FROM THE SURFACE OF THE DUCT SEGMENT. THE CUTTING TOOL CAN ACCIDENTALLY CUT THE DUCT SEGMENT THAT IS ADJACENT TO THE DAMAGED AREA, OR CAUSE DAMAGE TO THE FAN CASE.
 (3)  With a cutting tool, remove material, as shown in Fig. 802, from the crack in the duct segment.
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