---
kind: "section"
citation: "14 C.F.R. § 23.2245"
title: "14"
number: "23.2245"
heading: "Aeroelasticity."
url: "https://uscodex.org/cfr/14/23.2245"
---

# §23.2245. Aeroelasticity.

- (a) The airplane must be free from flutter, control reversal, and divergence—
  - (1) At all speeds within and sufficiently beyond the structural design envelope;
  - (2) For any configuration and condition of operation;
  - (3) Accounting for critical degrees of freedom; and
  - (4) **Accounting for any critical failures or malfunctions.**
- (b) The applicant must establish tolerances for all quantities that affect flutter.

## Notes

### Authority

Authority: 49 U.S.C. 106(f), 106(g), 40113, 44701-44702, 44704, Pub. L. 113-53, 127 Stat. 584 (49 U.S.C. 44704) note.

### Source

Source: Doc. No. FAA-2015-1621, Amdt. 23-64, 81 FR 96689, Dec. 30, 2016, unless otherwise noted.