---
kind: "section"
citation: "14 C.F.R. § 31.71"
title: "14"
number: "31.71"
heading: "Function and installation."
url: "https://uscodex.org/cfr/14/31.71"
---

# §31.71. Function and installation.

- (a) **Each item of installed equipment must—**
  - (1) Be of a kind and design appropriate to its intended function;
  - (2) Be permanently and legibly marked or, if the item is too small to mark, tagged as to its identification, function, or operating limitations, or any applicable combination of those factors;
  - (3) Be installed according to limitations specified for that equipment; and
  - (4) **Function properly when installed.**
- (b) No item of installed equipment, when performing its function, may affect the function of any other equipment so as to create an unsafe condition.
- (c) The equipment, systems, and installations must be designed to prevent hazards to the balloon in the event of a probable malfunction or failure.

## Notes

### Amendments

[Amdt. 31-4, 45 FR 60180, 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 60180, Sept. 11, 1980]