AFGS-87219 Electrical Power Systems, AircraftThis specification establishes the performance requirements and verifications for electric power subsystems EPS for aerospace vehicles, including aircraft, helicopters, and missiles.

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AFGS�87219B

f.        The battery and/or battery compartment shall be ventilated to prevent the accumulation of explosive mixtures of gases.  All vent tubes leading to the exterior of the aircraft shall be designed to preclude the collection of rainwater and other liquids for all ground and flight environments.

g.   The installation shall provide for maintaining battery temperature within the limits specified for battery operation.  Any heater or thermal insulation required for low temperature operation shall be provided as part of the aircraft's battery compartment and not as an integral part of the battery.

h.   Other battery requirements are as follows: ------------.

3.2.9.3   Generators.

Generator systems shall be in accordance with ------------.

3.2.9.4   Converters.

a.   DC to AC converters (inverters) shall be in accordance with: ------------.

b.   When equipment that is essential for safe flight derives power from an inverter, a spare inverter shall be provided.  Changeover from the main inverter to the spare shall be automatic in the event of main inverter failure.  Spare inverters may be used as operative units to supply power to nonessential loads, but these loads shall be dropped in the event of main inverter failures.

c.    AC to DC converters shall be in accordance with: ------------.  When the outputs of two or more AC to DC converters are parallel to supply a common DC bus, no single unit shall be loaded beyond its rating for the worst-case load unbalance or failure mode which can occur.

3.2.9.5   Other.

Requirements for other major components are as follows: ------------.

3.2.10  Environmental conditions.

The EPS and its components shall be capable of withstanding and operating under the following environmental conditions to which they are subjected during all phases of aircraft operation:

------------.   Performance shall be as follows: ------------.

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