72-33-01
 ALL  ú ú N01 Page 806 ú Jun 18/00
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEE A
SEE B
1
45` 
CRACK 
DUCT  FRONT FAN CASE 
SEGMENT  A 
SURFACE OF  PATCH 
DUCT SEGMENT 
FAN CASE  2 
REMOVE THIS 
MATERIAL  3 
MATERIAL REMOVAL 
A-A  PATCH REPAIR 
A-A 
5  4

A
A A
DAMAGE
B
C
6 (3 LOCATIONS ON EACH SEGMENT)
DAMAGE DUCT SEGMENT B
L-A6674 Repair of Cracks in the Duct Segments Figure 802
A15686
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 72-33-01
 ALL  ú ú N01 Page 807 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
S 118-013-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 398-014-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 potting compound to the repair area.

 (d)  
If it is necessary, use a piece of tape to keep the potting compound in position.

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

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

 (g)  
Remove the tape.

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 ALL  ú ú N01 Page 808 ú Jun 10/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
S 348-015-N00
 (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.

 S 418-016-N00
 (7)  If you removed the 1st-stage fan blades, install them (AMM 72-31-02/401).
 TASK 72-33-01-308-017-N00
 4. Repair of Surface Damage on the Duct Segment
____________________________________________
 A. Consumable Materials
 (1)  
G00000 Tape - Magic Mending

 (2)  
G00842 Cheesecloth - Unsized

 (3)  
A00000 Compound - Potting (PWA 603) (Optional to Dent Filler)

 (4)  
A00000 Filler - Aerodynamic Dent (Optional to potting compound)

 (5)  
B00148 - Solvent, Methyl Ethyl Ketone (MEK) (PMC 1820)

 (6)  
B00143 - Solvent, Trichlorotriflourothane (PMC 9087)

 B.
References

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

 C.
Access

 (1)  
Location Zone
　
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