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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
0.270 INCH CROWN
0.230 METRO
0.120 INCH
0.080 MA25S
0.120
INCH MA25S 0.080
OR CROWN METRO
FAN DUCT COWL ON THE RIGHT-HAND SIDE
Insulation Layer Thickness
Figure 802 (Sheet 1)
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78-31-01
ALL ú ú C01 Page 807 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / /
CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
0.270 CROWN INCH
0.230 METRO
0.120
INCH MA25S0.080
0.120 MA25S
INCH
0.080 OR CROWN METRO
FAN DUCT COWL ON THE LEFT-HAND SIDE
Insulation Layer Thickness
Figure 802 (Sheet 2)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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CFM56 ENGINES
737-300/400/500/ /MAINTENANCE MANUAL ////////////////////////
NOTE: This repair procedure uses molded patches of insulation with
____ the same thickness or greater than that of the original insulation on the cowl.
CAUTION: OBEY THE INSTRUCTIONS IN THE PROCEDURE TO CLEAN THE REPAIR
_______ AREAS. DO NOT USE SOLVENTS TO CLEAN THE REPAIR AREA BECAUSE CONTAMINATION OF THE INSULATION CAN OCCUR EASILY. DO NOT CAUSE SCRATCHES ON THE BASE METAL. IF YOU DO NOT OBEY THESE INSTRUCTIONS, YOU CAN CAUSE DAMAGE TO THE EQUIPMENT.
(a)
Cut through the top coat layer of the insulation with a sharp (not metal) knife. 1) Remove the insulation with a (not metal) scraper. 2) Remove the loose material with a soft brush or a clean
cheesecloth.
(b)
Apply the primer to the repair area. 1) Apply a constant layer to make the surface wet. 2) Dry the primer for 30 minutes at 75 |10°F. 3) The maximum cure time before you can apply a top coat layer
over the primer is two hours at 50 percent (or greater) humidity.
(c)
The maximum cure time is four hours at 30 to 49 percent humidity.
(d)
Where necessary, use BMS 10-102, Type I, Class 2, to apply a molded patch insulative coating system.
(e)
Cut the repair plug from the plug material to the accurate dimension of the repair area.
(f)
When you use Boeing Material Specification 10-102 to apply a Type I insulation coating, refer to the supplier's recommendations when you mix the coating.
(g) When you use BMS 10-102 TYPE II Grade A, prepare as follows: 1) The table in Fig. 801 shows the different catalyst concentrations that can be used to cure the BMS 10-102, Type II, Grade A, and the effects of the concentrations on handling properties. Do not use a catalyst concentration other than those indicated. Do not under any circumstances exceed the maximum catalyst concentration of 0.50 parts per hundred for Catalyst A or B.
2) Stir the base as necessary to make sure the pigments are uniformly dispersed and the material is homogeneous. 3) Add the necessary amount of catalyst as shown in Fig. 801 and fully mix. Use Catalyst B only for rework.
(h)
Apply the BMS 10-102, Type II, Grade A to the primed area and the repair plug mating surface.
(i)
Push the repair plug into position.
(j)
Seal the mating area between the insulation and the repair plug with the BMS 10-102, TYPE II, Grade A.
(k)
Use the teflon sheet to hold the plug in its position.
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