§3.636 Engine battery i.

tems. (a) Battery ignition/systems shall be supplemented with a génerator which is automatically made,available as an alternate source of electrical energy to permit continued engine operation in the event of the depletion of any battery. (b) The capacity of batteries and generators shall be sufficient to meet the simultaneous demands of the ensine ignition system and the greatest demands ot any of the airplane’s electrical system components which may draw electricai energy from the same source. Consideration shall be given to the condition of an inoperative generator, and to the condition of a completely depleted battery when the generator is running at its normal operating speed. If only one battery is provided, consideration shall also be given to the condition in which the battery is completely depleted and the generator is operating at idling speed. (c) Means shall be provided to warn the appropriate flight personnel if majfunctioning of any part of the electrical system is causing the continuous discharging of a battery used for engine ignition. (See § 3.629 for ignition switches.) POWER-PLANT FIRE PROTECTION