(3)
Optional - For Nonstructural Laminates Only:
(a) Uniformly lightly abrade by wet or dry blasting the laminate surface. Do not allow blasting to abrade the glass fiber reinforcement. Remove blasting residue by wiping with a clean cheesecloth wet with solvent. Before solvent evaporates, wipe surface dry with a clean, dry cheesecloth.
(4)
Treat the surface porosity by the following method: (See SOPM 20-10-06/3 for additional surfaces and fillers as applicable.)
500
May 01/98 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-21-21 Page 703
CAUTION: THE USE OF FILLERS, PUTTIES, AND SURFACES ARE EXCELLENT FOR PROVIDING SMOOTH SURFACES, HOWEVER, APPLYING EXCESSIVE AMOUNTS OF THOSE MAY CONTRIBUTE TO LONG-TERM POINT CHECKING.
(a) Surface Conditioner System
1) This system consists of static conditioner which shall be used to treat pinholes and surfacer which shall be used as required to treat larger surface defects than pinholes. In general, treatment is to allow paint to wet the surface and not to provide a surface flush with the surrounding area. Apply the static conditioner prior to application of the surfacer. Static conditioner, surfacer and conductive coating or primer are intended to be applied in a sequence of continuous process steps.
2) Static Conditioner
a) Apply the static conditioner without thinning, using a clean cheesecloth and sufficient pressure to force the filler into the minute pinholes of the laminate. Use a circular, overlapping, wiping motion.
b) Allow the conditioner to dry for approximately 30 minutes at room temperature or higher (until it turns white) then wipe the excess material from the laminate surface using a clean, dry cheesecloth.
c) The laminate shall be coated with subsequent material as soon as practicable after dried excess static conditioner has been wiped off. If surface becomes soiled after conditioner is applied, solvent clean using toluene or naphtha and reapply static conditioner.
3) Surfacer
CAUTION: THIS MATERIAL IS NOT TO BE USED AS A FAIRING COMPOUND OR CONTOURING MATERIAL.
a) Prepare the surfacer by mixing 4 parts by volume of surfacer with 1 part by volume hardener 50-C-3 or 10-C-32. Blend thoroughly and allow to digest for 15 minutes prior to application, thin with 1 part by volume reducer. The pot life of the mixed material is 6 hours at 70°F. Do not use material over 6 hours old.
b) Apply surfacer by brush, spray, cloth or squeegee, and allow to dry for 1 to 4 hours. Sand to desired smoothness using 150 grit or finer, abrasive paper.
NOTE: After 5-hour cure, the surfacer is extremely hard and difficult to sand. Therefore, complete all necessary sanding prior to 5-hour cure.
505
51-21-21 Page 704 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Apr 01/97
c) Remove sanding residue with clean cheesecloth wet with naphtha. Should any pinholes appear in the surfacer, treat with static conditioner after the surfacer has been sanded and solvent cleaned. Apply subsequent coating to filled surfacer as soon as practicable.
B. Unpainted plastic surfaces without surface porosity.
(1) Clean and treat per step A.(1) and A.(2) or A.(3) prior to applying the organic finish. CORROSION REMOVAL AND CONTROL - CLEANING/PAINTING
500
Apr 01/97 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 51-21-21 Page 705
1. General
A. Any structural part that has been subject to corrosive action must be carefully examined to determine its structural integrity. Corroded parts should be removed and if salvageable reworked. The same type of protective finish, which was previously on the part, should be reapplied. If it is not possible to remove the structurally sound part, specific treatments according to the type of material and degree of corrosion are to be applied.
WARNING: MANY MATERIALS USED TO IMPLEMENT THIS PROCEDURE ARE TOXIC, FLAMMABLE OR IRRITATING. AVOID BREATHING SOLVENT MISTS. PROVIDE ADEQUATE VENTILATION. AVOID PROLONGED CONTACT OF MATERIALS WITH THE SKIN. DO NOT GET IN EYES. USE PROTECTIVE EQUIPMENT AS REQUIRED. KEEP SOLVENTS AWAY FROM ALL SOURCES OF IGNITION.
CAUTION: ACID BRIGHTENERS AND PHOSPHORIC ACID CORROSION REMOVERS SHOULD NOT BE ALLOWED TO COME IN CONTACT WITH TEFLON LINED SELF-LUBRICATED BEARINGS OR ELECTRICAL TERMINAL PLUGS. CHEMICALS IN THESE MATERIALS WILL ATTACK COMPONENTS.
B. Corrosion removal and control procedures listed in this section are applicable to all areas except the wing upper inspar surface as defined in 51-21-131, Skin and Fastener Corrosion Control. Procedures apply only to light corrosion. For severe corrosion removal, refer to Structural Repair Manual.
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
本文链接地址：737 AMM 飞机维护手册 结构 STRUCTURES(11)
