CS 31HB.12 Proof of compliance
ED Decision 2009/005/R
Each requirement of this Subpart must be met at each mass within the range of loading conditions for which certification is requested. This must be shown by:
(a) Tests upon a balloon of the type for which certification is requested or by calculations based on, and equal in accuracy to, the results of testing; and
(b) Systematic investigation of each mass if compliance cannot be reasonably inferred from the masses investigated.
ED Decision 2009/005/R
The range of masses over which the balloon may be safely operated must be established and at least consists of:
(a) Maximum mass.
The maximum mass is the highest mass at which compliance with each applicable requirement of CS-31HB is shown. The maximum mass must be established so that it is not more than the least of: (See AMC 31HB.14(a))
(1) The maximum mass selected for the product;
(2) The design maximum mass, which is the highest mass at which each structural loading condition is shown; or
(3) The maximum mass at which compliance with each applicable flight requirement is shown.
(b) Minimum mass.
The minimum mass is the lowest mass at which compliance with each applicable flight requirement is shown. (See AMC 31HB.14(b))
Mass limitations between which the balloon may be safely operated must be included in the Flight Manual. (See CS 31HB.81(b)(2))
ED Decision 2009/005/R
The maximum mass corresponds to the maximum buoyancy. The lift-producing medium is not part of the maximum mass.
ED Decision 2009/005/R
Minimum mass: In arriving at this figure, especially with larger balloons, attention should be paid to the ability to properly operate the balloon, in terms of both its heating and venting, with the reduced envelope rigidity associated with low mass operation.
ED Decision 2009/005/R
The empty mass must be determined by weighing the balloon with installed equipment but without lifting gas. (See AMC 31HB.16)
ED Decision 2009/005/R
The equipment and configuration that is included in the empty mass should be specified. Refer also to AMC 31HB.81(b)(2).
ED Decision 2009/005/R
The balloon must be capable of climbing at least 90 metres in the first minute from a start in equilibrium at ground level. Compliance must be shown at the maximum mass appropriate to the conditions of the test. (See AMC 31HB.17)
AMC 31HB.17 Performance: climb
ED Decision 2009/005/R
"Conditions of the test" here refers to the combination of launch field elevation (launch altitude) and corresponding ambient air temperature. The test should be conducted at minimum specified burner fuel pressure.
ED Decision 2009/005/R
The balloon must be safely controllable and manoeuvrable without requiring exceptional piloting skill. Associated operational limitations must be established and included in the Flight Manual. (See CS 31HB.81(b)(2))