CS 31GB.27 Strength and proof of strength
ED Decision 2011/012/R
(a) The structure must be able to support limit loads without permanent deformations or other detrimental effects.
(b) The structure must be able to withstand ultimate loads for at least 3 seconds without failure.
(c) Proof of strength of the envelope material and other critical design features must be tested.
(d) The basket must be of a generally robust design and afford the occupants adequate protection during a hard or fast landing. There must be no design feature that by reasonably envisaged distortion or failure would be likely to cause serious injury to the occupants.
(e) Each item of mass that could cause an unsafe condition if it broke loose must be restrained under all loads up to the ultimate loads specified in this paragraph. The local attachments in the load path between the restrains and the structure should be designed to withstand 1.33 times the specified ultimate loads
Horizontal 6 g,
Downward 6 g,
Upward 2 g.
(f) The design and strength of components must also consider the effects of recurrent and other loads experienced during transportation, ground handling and rigging.
(g) The effect of temperature and other operating characteristics that may affect strength of the balloon must be accounted for.
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