(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 Surface Damage in the Duct Segment.
S 018-018-N00
(1) If you cannot get acces to the damage, remove the 1st-stage fan blades (AMM 72-31-02/401).
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 348-019-N00
CAUTION: DO NOT USE THIS PROCEDURE IF YOU CAN SEE THE METAL OF THE FAN
_______ CASE. THIS PROCEDURE WILL NOT MAKE A SUFFICIENT REPAIR IN THAT CONDITION.
(2) Refer to the limits in table 803 and Figure 803 to do the repair.
~............................................................................... | Table 803 | | Crack Repair Limits | ................................................................................. | Type of Damage | Area A | Area B | Area C | ................................................................................. |1) 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 | ................................................................................. |2)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 | | .................................................................................
|3) Circumferential | | 12 inches | |
|separation between | | (304.8 mm) | |
| incidents | | minimum | |
................................................................................. |4) The Retention | | | cannot be | | Pin is Visible | | | repaired | 2...................…...................…...................…...................1
S 348-020-N00
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)
Remove all cracks and loose material from the duct segment with a cutting tool.
S 348-021-N00
(4)
Lightly make rough the repair area.
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SEE A
PATCH DUCT SEGMENT 1 SURFACE OF THE SEE B
PATCH REPAIR A-A FRONT FAN CASE A
3 2
A DAMAGE
B
C A A
Repair of Surface Damage on the Duct Segment Figure 803 DUCT SEGMENT B 4 (3 LOCATIONS ON EACH SEGMENT) DAMAGE L-A6676
A15691
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S 348-022-N00
(5) Remove all of the remaining particles of material from the surface. S 118-023-N00
WARNING:_______ DO NOT GET THE SOLVENT IN YOUR MOUTH OR EYES, OR ON YOUR SKIN.
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