CAUTION: KEEP SANDBLAST NOZZLE IN MOTION TO PREVENT BLAST FROM DWELLING ON ONE SPOT.
(3)
Set equipment air pressure at 15 to 30 psig (103,4 to 206,8 kPa), then subject part to sandblast using sand (120 Grit) (MIL-A-22262) (SECTION VII). Air pressure may be reduced as required to control action on base metal of part.
(4)
Remove part from sandblast cabinet.
(5)
Rinse part free of sand, using running tap water.
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(6)
Dry part by placing in an oven, preheated to 175 to 225F (79 to 107C). Allow part to remain in oven for one hour.
(7)
Remove from oven and allow cooling.
C. Method No. 404C: Gouge and Scoring Repair Repair gouges, scoring, etc., on aluminum-alloy parts as follows: WARNING: SOLVENT VAPORS ARE TOXIC AND FLAMMABLE. DO NOT INHALE VAPORS. OBSERVE FIRE PRECAUTIONS.
USE CORRECT PERSONAL PROTECTION. PROCEDURES THAT NEED GRIND/MACHINE WORK WILL CAUSE LOOSE PARTICLES THAT CAN GET IN YOUR EYES.
CAUTION: THIS REPAIR METHOD SHALL NOT BE USED ON ALUMINUM-ALLOY PARTS REQUIRED IN A STRUCTURAL APPLICATION.
(1)
Machine damaged surfaces while maintaining dimensional limits specified in applicable Overhaul Manual. Clean machined surfaces using solvent (Federal Specification P-D-680, Type I) (SECTION VII).
(2)
Perform fluorescent penetrant inspection (SECTION III).
NOTE: Manufacturer furnishes surface preparation and application instructions, CMC Specification PS-1, PS-2, PS-3, and PS-5 with purchase of Epoxy Repair Compound.
(3)
Mask areas not requiring repair before applying Epoxy Repair Compound.
(4)
Prepare surfaces to be repaired per CMC Specification PS-l and apply Epoxy Repair Compound (SECTION VII) by spray, brush, or blade application per CMC Specification PS-2 or PS-3 to fill gouges, scoring, or buildup surfaces as required to maintain dimensions listed in applicable Overhaul Manual.
CAUTION: DO NOT EXCEED TEMPERATURE LIMITATIONS DURING CURE PERIOD.
(5)
Allow compound to air-dry for 24 hours, then cure in an oven per CMC Specification PS-5.
(6)
Remove from oven and allow cooling.
D. Method No. 404D: Fuel and Oil Pump Aluminum Housing Surface Repair
Repair worn or damaged surfaces and/or pockets on aluminum fuel and oil pump housings as follows:
WARNING: USE CORRECT PERSONAL PROTECTION. PROCEDURES THAT NEED GRIND/MACHINE WORK WILL CAUSE LOOSE PARTICLES THAT CAN GET IN YOUR EYES.
(1) Machine damaged surfaces while maintaining dimensional limits specified in applicable manual.
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(2) Perform fluorescent penetrant inspection (SECTION III). Refer to applicable manual.
(3) Clean machined surfaces using solvent (Federal Specification P-D-680, Type 1)
(SECTION VIII).
(4) Mask any surface that might be damaged by abrasive blasting.
CAUTION: KEEP SANDBLAST NOZZLE IN MOTION TO PREVENT BLAS FROM DWELLING ON ONE SPOT.
(5)
Set equipment air pressure at 15 to 30psig (103,4 to 206,8 kPa), then subject part to sandblast using sand (120Grit) (MIL-S-17726) (SECTION VII). Air pressure may be reduced as required to control action on base metal part.
(6)
Remove part from sandblast cabinet. Rinse part free of sand using running tab water.
(7)
Dry part by placing in an oven, preheated to 175 to 225 F (79 to 107C).
(8)
Allow part to remain in oven for one hour.
WARNING: SOLVENT VAPORS ARE TOXIC AND FLAMMABLE. DO NOT INHALE VAPORS. OBSERVE FIRE PRECAUTIONS.
(9)
Clean part using solvent (Federal Specification P-D-680, Type 1) (SECTION VIII).
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