14 CFR 31.21 : Aeronautics And Space (§ 1.1 To Parts 1311-1399) — (§ 1.1 To Parts 50-59) — Federal Aviation Administration, Department Of Transportation (§ 1.1 To Parts 50-59) — Aircraft (§ 21.1 To Parts 50-59) — Airworthiness Standards: Manned Free Balloons (§ 31.1 To Appendix A To Part 31) — Strength Requirements (§ 31.21 To § 31.27) — Loads.

4 Aug 2016

Strength requirements are specified in terms of limit loads, that are the maximum load to be expected in service, and ultimate loads, that are limit loads multiplied by prescribed factors of safety. Unless otherwise specified, all prescribed loads are limit loads.

14 CFR 31.21