ED Decision 2011/012/R
Minimum mass. The determination of the minimum mass should take into consideration that the controllability of the balloon might be affected by a low internal pressure at low mass.
At least the following should be demonstrated:
In landing configuration with minimum crew, untaut condition and already disposed minimum ballast, all controls (e.g. parachute, valve, rip panel, control lines, etc.) should have a positive performance and function easily and smoothly.
Note: An untaut condition is a flight with a ‘slack’ envelope and open appendix.
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