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AC 43.13-1B 9/8/98 m. Voltage check of electrical system with portable precision voltmeter. n. Condition of electric lamps. o. Missing safety shields on exposed high-voltage terminals (i.e., 115/200V ac). 11-3. FUNCTIONAL CHECK OF STAND-BY OR EMERGENCY EQUIP- MENT. An aircraft should have functional tests performed at regular intervals as pre- scribed by the manufacturer. The inspections or functional check periods should be clearly stated in the aircraft maintenance manual, along with the overhaul intervals. 11-4. CLEANING AND PRESERVA- TION. Annual cleaning of electrical equip- ment to remove dust, dirt, and grime is rec- ommended. Suitable solvents or fine abrasives that will not score the surface or remove the plating may be used to clean the terminals and mating surfaces if they are corroded or dirty. Only cleaning agents that do not leave any type of residue must be used. Components must be cleaned and preserved in accordance with the aircraft handbooks or manufacturer’s instruc- tions. Avoid using emery cloth to polish commutators or slip rings because particles may cause shorting and burning. Be sure that protective finishes are not scored or damaged when cleaning. Ensure that metal-to-metal electrically bonded surfaces are treated at the interface with a suitable anti-corrosive con- ductive coating, and that the joint is sealed around the edges by restoring the original primer and paint finish. Connections that must withstand a highly corrosive environment may be encapsulated with an approved sealant in order to prevent corrosion. CAUTION: Turn power off before cleaning. 11-5. BATTERY ELECTROLYTE COR- ROSION. Corrosion found on or near lead- acid batteries can be removed mechanically with a stiff bristle brush and then chemically neutralized with a 10percent sodium bicar- bonate and water solution. For Nickel Cad- mium (NiCad) batteries, a 3 percent solution of acetic acid can be used to neutralize the electrolyte. After neutralizing, the battery should be washed with clean water and thor- oughly dried. 11-6. ADJUSTMENT AND REPAIR. Ac- complish adjustments to items of equipment such as regulators, alternators, generators, contactors, control devices, inverters, and re- lays at a location outside the aircraft, and on a test stand or test bench where all necessary in- struments and test equipment are at hand. Follow the adjustment and repair procedures outlined by the equipment or aircraft manu- facturer. Replacement or repair must be ac- complished as a part of routine maintenance. Adjustment of a replacement voltage regulator is likely since there will always be a difference in impedance between the manufacturer’s test equipment and the aircraft’s electrical system. 11-7. INSULATION OF ELECTRICAL EQUIPMENT. In some cases, electrical equipment is connected into a heavy current circuit, perhaps as a control device or relay. Such equipment is normally insulated from the mounting structure since grounding the frame of the equipment may result in a serious ground fault in the event of equipment internal failure. Stranded 18 or 20 AWG wire should be used as a grounding strap to avoid shock hazard to equipment and personnel. If the end connection is used for shock hazard, the ground wire must be large enough to carry the Page 11-2 Par 11-2 highest possible max.). current (0.1 to 0.2 ohmsPDF Image | AFS-640
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