ED Decision 2011/013/R
The term "envelope" here includes the integral vertical and horizontal load tapes as well as the envelope fabric(s). It should be noted that the envelope to suspension system pick-up points (sometimes known as ‘turnbacks’) should be regarded as part of the suspension system, rather than the envelope, as far as CS 31HB.25 is concerned.
"Suspension components" here are those components, from the base of the envelope down, upon which form the primary load paths of the trapeze, basket or other means provided for the occupants.
The individual structural elements in the suspension system should be dimensioned and configured or duplicated so that failure of one structural element (single failure) does not cause any uncontrollable operating condition. The factors of safety apply to all parts of the load bearing path (e.g. joints, splices, knots, terminals etc).
The post-single failure case should be justified with the application of limit loads.
[Amdt No.: 31HB/1]
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