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AVIONICS EQUIPMENT CLEANING
RECOVERY AND RECLAMATION OF CRASH DAMAGED AIRCRAFT

Aviation Maintenance Ratings - Aviation theories and other practices
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When dust. contaminants, or corrosion are detected, action is required. If the corrosion is within repairable limits specified in the applicable MIM or local directive. initiate corrective action. Corrective action includes cleaning, corrosion removal, treatment. and preservation. The nature of some surfaces, such as chrome-, nickel-, gold-, and silver-plated contacts. limits the use of highly abrasive cleaning methods. You can remove tarnish and light corrosion from these surfaces by rubbing with one of the following materials: An eraser (conforming to specification ZZ-E-661) known as magic rub, ruby red, wood, or paper encased (pencil-type) or typewriter eraser A nonabrasive cleaning pad (MIL-C-83957) for laminated circuit boards. waveguides, relay contacts. etc. A brush (toothbrush H-T-560 or typewriter brush H-B-681) for general scrubbing of dirt, soil, and corrosive products on circuit components Remove light to heavy corrosion from surfaces, such as covers, connectors, receptacles, antenna mounts, equipment racks, and chassis, by hand rubbing and by using aluminum oxide abrasive cloth. You may use either MIL-A-9962, type I, grade A (very fine), grade B (fine), or aluminum oxide abrasive cloth P-C-451, 320 grit, to do this task. USE OF COVERS AND SHROUDS When an aircraft is delivered by the manufacturer, it has a complete set of tailored dust and protective covers. Figure 4-7 shows a typical set of covers. Install all covers so free drainage will occur. Do NOT create a bathtub that will trap-and hold water. In warm weather, shrouds and covers cause a greenhouse effect, and cause condensation of moisture. Therefore, loosen and remove shrouds and covers and ventilate the aircraft on warm sunny days. However, where protection from salt spray is required, leave the covers in place, and ventilate the aircraft in good weather Figure 4-7.—Dust and protective covers. 4-14







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