CS 31TGB.27 Strength and proof of strength
ED Decision 2013/011/R
(a) The structure is able to support limit loads without permanent deformation or other detrimental effects.
(b) The structure is 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 are tested.
(d) The gondola is of a generally robust design and provides the occupants adequate protection during a hard landing.
(e) The design and strength of components also considers the effects of recurrent and other loads experienced during transportation, ground handling, and mooring.
(f) The effect of temperature and other environmental conditions that may affect strength of the balloon is accounted for.
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