Resin Component 7-X-74 FC (gray)
Hardener Component 1
C. If additional thinning is desired, thin mixed material to a maximum of 20% by volume with solvent-reducer 66-C-20.
D. Mix the components together thoroughly by stirring only; do not shake.
E. Use 5 to 10 minutes after mixing; usable pot life is 45 minutes at 70°F.
F. Apply by brushing in one direction to cover the required area to a thickness of 6 to 8 mils (0.006 to 0.008 inch) dry film thickness. Allow 30 minutes between brush coats.
G. Prior to service allow the last topcoat to air dry 8 hours at 70°F.
NOTE: Applying heat at 140°F for two hours will accelerate curing and dry coating sufficiently to allow operation of airplane.
500
Feb 15/73 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-21-81 Page 705
WATER DISPLACING CORROSION INHIBITING COMPOUND - CLEANING/PAINTING
1. General
A. This procedure provides information on application of water displacing corrosion inhibiting compound BMS 3-23. If used, it is recommended to reapply BMS 3-23 periodically.
WARNING: BMS 3-23 IS APPROXIMATELY EQUAL TO KEROSENE OR ALIPHATIC NAPHTHA IN TOXICITY. TO PROTECT SKIN, USE SAME PRECAUTIONS FOR BMS 3-23 AS FOR KEROSENE. WHEN SPRAYING BMS 3-23 IN AN ENCLOSED AREA SUCH AS LOWER FUSELAGE, A VAPOR CONCENTRATION OF 500 PARTS PER MILLION IS THE MAXIMUM COMFORTABLE WORKING LIMIT. AT THIS CONCENTRATION, A MAN CAN WORK AN 8-HOUR SHIFT. VAPOR LEVELS EXCEEDING 500 PMM ARE NOT DIRECTLY TOXIC, BUT FORCED VENTILATION MAY BE NECESSARY TO MAINTAIN A COMFORTABLE LEVEL. PERCHLOROETHYLENE IS PREFERRED SOLVENT AS IT IS NONFLAMMABLE. PERCHLOROETHYLENE IS TOXIC. IF USED ON EXTREMELY CONFINED AREAS, MECHANICAL VENTILATION IS MANDATORY. RESPIRATORY AND SKIN PROTECTION MAY BE NECESSARY.
NOTE: Each operator should evaluate his airplanes environment, the inhibitor used, and the application schedule to ensure adequate corrosion protection. Although Boeing has developed BMS 3-23 as a standard for organic corrosion inhibitors and recommends its use, other water displacing corrosion inhibiting compounds may be satisfactory, based on operator evaluation and experience.
B. BMS 3-23 contains wax compounds and is not suitable on surfaces that will exceed 150°F.
CAUTION: AS A FIRE SAFETY PRECAUTION BMS 3-23 SHOULD BE KEPT AWAY FROM SURFACES WHICH MAY ATTAIN 300 DEGREES F OR MORE IN SERVICE. DRY FILM FLASH POINT IS 500 DEGREES F.
C. Application of additional finishes, such as paint or primer, may be difficult due to penetrating qualities of BMS 3-23 and possibility of bleedout from faying surfaces.
D. Allow primer and/or enamel to dry for 8 hours minimum before applying BMS 3-23.
500
Jun 20/86 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-21-91 Page 701
E. Boeing recommends application of BMS 3-23 in the following areas:
DESCRIPTION OF AREA
LANDING GEAR MAIN GEAR OUTER CYLINDER MAIN GEAR INNER CYLINDER TRUNNION LINK SIDE STRUT ACTUATOR BEAM NOSE GEAR OUTER CYLINDER NOSE GEAR STEERING CYLINDERS WHEEL WELL AREAS
MAIN LANDING GEAR TRUNNION SUPPORT SUPPORT BEAM (REF SB 57-119) METHOD OF BMS 3-23 APPLICATION
APPLY TO ALL AREAS OF DAMAGED PAINT OR PLATING AND TO INSIDE SURFACES OF INACCESSIBLE MEMBERS OFASSEMBLED GEAR EXPOSED TO ATMOSPHERE. SPRAY ALL ATTACHMENT LUGS WITH PARTICULAR ATTENTION GIVEN TO LUG FACES AND CONNECTING PINS. DO NOT APPLY TO CHROMED PISTON OR STRUT INNER CYLINDER. APPLY GREASE TO GREASE FITTINGS AFTER APPLICATION OF BMS 3-23.
COVER PRESSURE SIDE OF NOSE WHEEL WELL APPROXIMATELY 3 INCHES UP EACH SIDEWALL. APPLY IN MAIN WHEEL WELL CAVITY; AFT FACE OF WING CENTER SECTION REAR SPAR, LOWER SURFACE OF PRESSURE DECK, FORWARD FACE OF STA 727 BULKHEAD, EXTERIOR OF KEEL BEAM FROM REAR SPAR TO STA 727 BULKHEAD, AND ALL WHEEL WELL FAIRING AND STRUCTURE.
APPLY TO ALL SURFACES OF THE SUPPORT BEAM, TO ALL CONNECTION POINTS INCLUDING INBOARD AND OUTBOARD TEFLON BUSHED CONNECTION POINTS.
51-21-91 Jun 20/86
Page 702
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
DESCRIPTION OF AREA METHOD OF BMS 3-23 APPLICATION
DOORS ENTRY, GALLEY AND CARGO DOORS SPRAY DOOR & FUSELAGE HINGE AREAS, PARTICULARLY AT CONNECTION POINTS AND UNDER ENTRY AND SERVICE DOOR SCUFF PLATES. APPLY TO LOWER 3 TO 4 INCHES OF DOOR INTERIORS.
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