vertical oily or greasy surfaces where water rinsing can be tolerated. AVIONIC CLEANING MATERIALS The materials discussed in this section are the ones used most often when avionics and electrical equipment are cleaned. For a complete list, description, and application of avionic cleaning materials. you should refer to NAVAIR 16-l-540. MIL-D-16791, type 1 detergent, is used to clean transparent plastics and glass. Also, it is used at I-level maintenance activities as a water-based solvent spray in cleaning booths and aqueous ultrasonic cleaners. For cleaning by hand, you should apply it to the area to be cleaned with a flannel cloth, let it dry, and then remove it with a flannel cloth. Trichlorotrifluoroethane is commonly known as Freon (MIL-C-81302 cleaning compound). It is a general cleaner for avionic and electrical systems. You can use MIL-C-81302 Freon as type I (ultraclean) or type II cleaner. The uses for these types of cleaners are discussed in the following text. TYPE I, MIL-C-81302, is used on precision equipment where an ultraclean solvent is required. It i s  u s e d  i n  c l e a n  r o o m  a p p l i c a t i o n s  i n intermediate-level maintenance activities. TYPE II: MIL-C-81302, is used on all internal areas of avionics equipment. Normally, type II should be filtered before it is used. It can be used to clean dirt and dust from areas before soldering. The application procedures and restrictions applying to MIL-C-81302, types I and II, are the same. They are as follows: Apply by wiping or scrubbing the affected area with an acid brush or toothbrush. Air dry or oven dry, as applicable. Do not use on acrylic plastics or acrylic conformal coatings. Do not use on unsealed aluminum electrolytic capacitors. Damage may result to end caps and cause leakage. Isopropyl alcohol (TT-I-735) is a general-purpose cleaner and solvent. Use it to remove salt residue and contaminants from internal avionics and electrical equipment. Use an acid brush or pipe cleaner to apply a solution of isopropyl alcohol and water. Then, wipe clean and air dry. NOTE: Isopropyl alcohol is highly flammable and requires the same handling and storage procedures as other solvents. MECHANICAL CLEANING MATERIALS Mechanical cleaning materials consist of items such as abrasive papers: polishing compounds, polishing cloths, steel wool, and wadding. These materials are available in the supply system. However, use them as outlined in the cleaning procedures section of NAVAIR 01-1A-509 and the specific MIM. These procedures prevent damage to finishes and surfaces. In cases of conflicting information, NAVAIR 01-1A-509 always takes precedence. Aluminum oxide abrasive cloth is available in several forms. It is safe to use on most surfaces because it does not contain sharp or needlelike abrasives. Avoid the use of silicon carbide papers as a substitute for aluminum oxide. The grain structure of silicon carbide is sharp. It is so hard that individual grains can penetrate steel surfaces. Impregnated cotton wadding is used to remove exhaust gas stains and to polish corroded aluminum surfaces. It is also used on other metal surfaces to produce a high reflection. Aluminum metal polish is used to produce a high-luster, long-lasting polish on unpainted aluminum-clad surfaces. It is not used on anodized surfaces because it will remove the oxide coat. Q19. Q20. Q21. Q22. Q23. Q24. Q25. What are the most serious hazards in handling, using, and storing aircraft cleaning materials? Why is there a requirement to use a respirator when working with solvents? What must be done specifically when storing solvents that contain more than 24% chlorinated materials? Where must flammable liquids be stored when not in use? By what means is dry-cleaning solvent applied? Safety solvent is currently referred to by what name? List the application procedures and restrictions that apply to ML-C-81302, types I and II. 4-9