49 CFR 172 Special Provision A53 (A-Codes)

These provisions apply only to transportation by aircraft.
Description Refrigerating machines and refrigerating machine components are not subject to the requirements of this subchapter when containing less than 12 kg (26.4 pounds) of a non-flammable gas or when containing 12 L (3 gallons) or less of ammonia solution (UN2672) (see §173.307 of this subchapter).
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