................................................................................. |5) The Retention | | | cannot be | | Pin is Visible | | | repaired | ....................…...................…...................….................... | * For damage that is in a pocket, remove the full cracked area. | 2...............................................................................1
 S 348-004-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 the damage from the duct segment with a cutting tool.
 NOTE: It is not necessary to go through the duct segment, unless
____ the damage is in a pocket.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE A
SEE B
POTTING COMPOUND
FAN CASE
____ EXAMPLE OF POTTING COMPOUND THAT ISNOTE:
APPLIED TO REPAIRED DAMAGE THAT MAKES  FRONT FAN CASE
A HOLE THROUGH THE SURFACE.
A
A-A
2
1
POCKET
A A
A
3

DAMAGE
B
C
5 (3 LOCATIONS ON EACH SEGMENT)
DUCT SEGMENT
B

L-A6672
Repair of Large Holes in the Duct Segments
Figure 801

A15685
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 118-005-N00

 WARNING:_______ DO NOT GET THE SOLVENT IN YOUR MOUTH OR EYES, OR ON YOUR SKIN.
 DO NOT BREATHE THE FUMES FROM THE SOLVENT.  PUT ON A PROTECTIVE
 SPLASH GOGGLE AND GLOVES WHEN YOU USE THE SOLVENT.  KEEP THE
 SOLVENT AWAY FROM SPARKS, FLAME AND HEAT.  THE SOLVENT IS
 POISONOUS AND FLAMMABLE AND CAN CAUSE INJURY TO PERSONS OR

 DAMAGE TO EQUIPMENT.
 (4)  
Do the steps that follow with one of the two solvents (Methyl Ethyl Ketone or Trichlorotrifluoroethane) to clean the repair area.

 (a)  
Apply some solvent, from a soft bottle, to the repair area.

 (b)  
Make wet a piece of cheesecloth with the solvent.

 (c)  
Clean the repair area with the cheesecloth.

 (d)  
Dry the repair area in air for 10 (ten) minutes.

 S 398-006-N00
 (5)  
Do the steps that follow to apply the potting compound to the repair area.

 (a)  
In a clean cup, mix 1.0 gram of Part A with 0.09 gram of Part B.

 (b)  
Stir the mixture for two minutes.

 NOTE: The mixture must be discarded after 30 minutes.
____
 (c)  
Use a clean dry tool to apply the compound to the repair area.

 (d)  
If the damage is a hole in one of the pockets, push in a quantity of compound sufficient to support the patch.

 (e)  
If the compound can easily fall out, use a piece of tape to keep the compound attached.

 (f)  
Dry the compound for 3 (three) hours at ambient temperature before you touch it, or before the operation of the engine.

 NOTE: The compound will be fully dry after 24 hours at ambient
____ temperature.
 (g)  
An alternate cure time of 2 (two) hours at 250°F (121.1°C) is also permitted.

 (h)  
Remove the tape.

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