AMC1 31TGB.20(b) Controllability
ED Decision 2013/011/R
It is established by analysis that the hazards from the specified emergency conditions are mitigated by design or procedures. Failure modes that can result in an unintended free flight of the balloon with occupants are included in this analysis.
A suitable device (e.g. electronic altitude pressure switch combined with an ascent velocity detector) ensuring that the envelope does not burst and a lifting gas valve is operated such that a descent occurs in a manageable manner is regarded as acceptable.
A suitable procedure describes all necessary measures to be taken for the recovery.
If procedures for these emergency conditions are not covered by the normal operating procedures they are included in the Flight Manual.
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