Part 21 Manual of Standards Instrument 2016
9Minimum performance standard — marking
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9 Minimum performance standard — marking
(1) The refrigerated cargo unit load container must be permanently and legibly marked in accordance with section 8 of the ULD Technical Manual 13th.
(2) The container must be permanently and legibly marked with:
(a) the environmental categories over which the equipment has been designated to operate in accordance with RTCA/DO-160D; and
(b) if an environment category is not applicable and a test is not conducted — an “X” in the space in which that category would otherwise be marked.