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9/8/98 AC 43.13-1B neutralize with a solution of baking soda and water, and shower or flush the affected area with water. For the eyes, use an eye fountain and flush with an abundance of water. If potas- sium hydroxide contacts the skin, neu- tralize with 9 percent acetic acid, vinegar, or lemon juice and wash with water. For the eyes, wash with a weak solution of boric acid or a weak solu- tion of vinegar and flush with water. 11-21. NOXIOUS FUMES. When charging rates are excessive, the electrolyte may boil to the extent that fumes containing droplets of the electrolyte are emitted through the cell vents. These fumes from lead-acid batteries may be- come noxious to the crew members and pas- sengers; therefore, thoroughly check the vent- ing system. NiCad batteries will emit gas near the end of the charging process and during overcharge. The battery vent system in the air- craft should have sufficient air flow to prevent this explosive mixture from accumulating. It is often advantageous to install a jar in the battery vent discharge system serviced with an agent to neutralize the corrosive effect of bat- tery vapors. 11-22. INSTALLATION PRACTICES. a. External Surface. Clean the external surface of the battery prior to installation in the aircraft. b. Replacing Lead-Acid Batteries. When replacing lead-acid batteries with NiCad batteries, a battery temperature or current monitoring system must be installed. Neu- tralize the battery box or compartment and thoroughly flush with water and dry. A flight manual supplement must also be provided for the NiCad battery installation. Acid residue can be detrimental to the proper functioning of a NiCad battery, as alkaline will be to a lead- acid battery. c. Battery Venting. Battery fumes and gases may cause an explosive mixture or con- taminated compartments and should be dis- persed by adequate ventilation. Venting sys- tems often use ram pressure to flush fresh air through the battery case or enclosure to a safe overboard discharge point. The venting sys- tem pressure differential should always be positive, and remain between recommended minimum and maximum values. Line runs should not permit battery overflow fluids or condensation to be trapped and prevent free airflow. d. Battery Sump Jars. A battery sump jar installation may be incorporated in the venting system to dispose of battery electrolyte overflow. The sump jar should be of adequate design and the proper neutralizing agent used. The sump jar must be located only on the dis- charge side of the battery venting system. (See figure 11-1.) FIGURE 11-1. Battery ventilating systems. e. Installing Batteries. When installing batteries in an aircraft, exercise care to prevent inadvertent shorting of the battery terminals. Serious damage to the aircraft structure (frame, skin and other subsystems, avionics, wire, fuel etc.) can be sustained by the resultant high dis- charge of electrical energy. This condition Par 11-20 Page 11-9PDF Image | AFS-640
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