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Code of Federal Regulations (Last Updated: July 5, 2024) |
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Title 14 - Aeronautics and Space |
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Chapter I - Federal Aviation Administration, Department of Transportation |
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SubChapter C - Aircraft |
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Part 27 - Airworthiness Standards: Normal Category Rotorcraft |
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Subpart F - Equipment |
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Electrical Systems and Equipment |
§ 27.1353 - Energy storage systems.
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§ 27.1353 Storage battery design and installation.
(a) Each storage batteryEnergy storage systems.
Energy storage systems must be designed and installed as
prescribed in this section.(b) Safe cell temperatures and pressures must be maintained during any probable charging and discharging condition. No uncontrolled increase in cell temperature may result when the battery is recharged (after previous complete discharge)—
(1) At maximum regulated voltage or power;
(2) During a flight of maximum duration; and
(3) Under the most adverse cooling condition likely to occur in service.
(d) No explosive or toxic gases emitted by any battery in normal operation, or as the result of any probable malfunction in the charging system or battery installation, may(c) Compliance with paragraph (b) of this section must be shown by test unless experience with similar batteries and installations has shown that maintaining safe cell temperatures and pressures presents no problem.
follows:
(a) Energy storage systems must provide automatic protective features for any conditions that could prevent continued safe flight and landing.
(b) Energy storage systems must not emit any flammable, explosive, or toxic gases, smoke, or fluids that could accumulate in hazardous quantities within the rotorcraft.
e(
No corrosivec)
mayCorrosive fluids or gases that
battery mayescape from the
orsystem must not damage surrounding structures
essential equipment, adjacent
equipment, or systems necessary for continued safe flight and landing.
f) Each nickel cadmium battery installation capable of being used to start an engine or auxiliary power unit must have provisions to prevent any hazardous effect on structure or essential systems that may be caused by the(
the battery can generate during a short circuit of the battery or of its individual cells.d) The maximum amount of heat
[Doc. No. 5074, 29 FR 15695, Nov. 24, 1964, as amended by Amdt. 27–13, 42 FR 36972, July 18, 1977; Amdt. 27–14, 43 FR 2325, Jan. 16, 1978(g) Nickel cadmium battery installations capable of being used to start an engine or auxiliary power unit must have—
(1) A system to control the charging rate of the battery automatically so as to prevent battery overheating;
(2) A battery temperature sensing and over-temperature warning system with a means for disconnecting the battery from its charging source in the event of an over-temperature condition; or
(3) A battery failure sensing and warning system with a means for disconnecting the battery from its charging source in the event of battery failure.
and pressure that can be generated during any operation or under any failure condition of the energy storage system or its individual components must not result in any hazardous effect on rotorcraft structure, equipment, or systems necessary for continued safe flight and landing.
(e) Energy storage system installations required for continued safe flight and landing of the rotorcraft must have monitoring features and a means to indicate to the pilot the status of all critical system parameters.
[Amdt. 27–51, 88 FR 8738, Feb. 10, 2023]