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AC 43.13-1B 9/8/98 having a shorted cell might overheat due to ex- cessive overcharge and undergo a thermal run- away, destroying the battery and creating a possible safety hazard to the aircraft. DEFINITION: Thermal runaway can result in a chemical fire and/or explo- sion of the NiCad battery under re- charge by a constant-voltage source, and is due to cyclical, ever-increasing temperature and charging current. One or more shorted cells or an exist- ing high temperature and low charge can produce the cyclical sequence of events: (2) increased (3) decreased (4) further increased (5) further increased This will not become a self-sustaining thermal-chemical action if the con- stant-voltage charging source is re- moved before the battery temperature is in excess of 160 °F. (10) Pulsed-current battery chargers are sometimes provided for NiCad batteries. CAUTION: It is important to use the proper charging procedures for bat- teries under test and maintenance. These charging regimes for recondi- tioning and charging cycles are de- fined by the aircraft manufacturer and should be closely followed. f. Shop-Level Maintenance Procedures. Shop procedures must follow the manufac- turer’s recommendations. Careful examination of sealed batteries and proper reconditioning of vented batteries will ensure the longest possi- ble service life. g. Aircraft Battery Inspection. (1) Inspect battery sump jar and lines Page 11-8 Par 11-19 (1) excessive current, temperature, for condition and security. (2) Inspect battery terminals and quick- disconnect plugs and pins for evidence of cor- rosion, pitting, arcing, and burns. Clean as re- quired. (3) Inspect battery drain and vent lines for restriction, deterioration, and security. (4) Routine pre-flight and post-flight inspection procedures should include observa- tion for evidence of physical damage, loose connections, and electrolyte loss. 11-20. ELECTROLYTE SPILLAGE. Spillage or leakage of electrolyte may result in serious corrosion of the nearby structure or control elements as both sulfuric acid and po- tassium hydroxide are actively corrosive. Electrolyte may be spilled during ground servicing, leaked when cell case rupture oc- curs, or sprayed from cell vents due to exces- sive charging rates. If the battery is not case enclosed, properly treat structural parts near the battery that may be affected by acid fumes. Treat all case and drain surfaces, that have been affected by electrolyte, with a solution of sodium bicarbonate (for acid electrolyte) or boric acid, vinegar, or a 3 percent solution of acetic acid (for potassium hydroxide electrolyte). CAUTION: Serious burns will result if the electrolyte comes in contact with any part of the body. Use rubber gloves, rubber apron, and protective goggles when handling electrolyte. If sulfuric acid is splashed on the body, cell(s) resistance, current, and temperature.PDF Image | AFS-640
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