---
kind: "section"
citation: "14 C.F.R. § 31.12"
title: "14"
number: "31.12"
heading: "Proof of compliance."
url: "https://uscodex.org/cfr/14/31.12"
---

# §31.12. Proof of compliance.

- (a) Each requirement of this subpart must be met at each weight within the range of loading conditions for which certification is requested. This must be shown by—
  - (1) 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
  - (2) Systematic investigation of each weight if compliance cannot be reasonably inferred from the weights investigated.
- (b) Except as provided in [§ 31.17(b)](/cfr/14/31.17.md?p=b), allowable weight tolerances during flight testing are + 5 percent and −10 percent.

## Notes

### Amendments

[Amdt. 31-4, 45 FR 60179, Sept. 11, 1980]

### Authority

Authority: 49 U.S.C. 106(g), 40113, 44701-44702, 44704.

### Source

Source: Docket No. 1437, 29 FR 8258, July 1, 1964, as amended by Amdt. 31-1, 29 FR 14563, Oct. 24, 1964, unless otherwise noted.

### Amendments

[Amdt. 31-4, 45 FR 60179, Sept. 11, 1980]