---
kind: "section"
citation: "14 C.F.R. § 91.413"
title: "14"
number: "91.413"
heading: "ATC transponder tests and inspections."
url: "https://uscodex.org/cfr/14/91.413"
---

# §91.413. ATC transponder tests and inspections.

- (a) No persons may use an ATC transponder that is specified in 91.215(a), 121.345(c), or [§ 135.143(c)](/cfr/14/135.143.md?p=c) of this chapter unless, within the preceding 24 calendar months, the ATC transponder has been tested and inspected and found to comply with appendix F of [part 43](/cfr/14/part43.md) of this chapter; and
- (b) Following any installation or maintenance on an ATC transponder where data correspondence error could be introduced, the integrated system has been tested, inspected, and found to comply with [paragraph (c)](#c), appendix E, of [part 43](/cfr/14/part43.md) of this chapter.
- (c) The tests and inspections specified in this section must be conducted by—
  - (1) **A certificated repair station properly equipped to perform those functions and holding—**
    - (i) A radio rating, Class III;
    - (ii) A limited radio rating appropriate to the make and model transponder to be tested;
    - (iii) A limited rating appropriate to the test to be performed;
  - (2) A holder of a continuous airworthiness maintenance program as provided in [part 121](/cfr/14/part121.md) or [§ 135.411(a)(2)](/cfr/14/135.411.md?p=a-2) of this chapter; or
  - (3) The manufacturer of the aircraft on which the transponder to be tested is installed, if the transponder was installed by that manufacturer.

## Notes

### Amendments

[Docket 18334, 54 FR 34311, Aug. 18, 1989, as amended by Amdt. 91-267, 66 FR 21066, Apr. 27, 2001; Amdt. 91-269, 66 FR 41116, Aug. 6, 2001]

### Source

Source: Docket 18334, 54 FR 34311, Aug. 18, 1989, unless otherwise noted.

### Authority

Authority: 49 U.S.C. 106(f), 40101, 40103, 40105, 40113, 40120, 44101, 44111, 44701, 44704, 44709, 44711, 44712, 44715,44716, 44717, 44722, 44740, 46306, 46315, 46316, 46504, 46506-46507, 47122, 47508,47528-47531, 47534; Pub. L. 112-95, 126 Stat. 11; Pub. L. 114-190, 130 Stat. 615 (49 U.S.C. 44703 note); sec. 828, Pub. L. 118-63, 138 Stat. 1330 (49 U.S.C. 44703 note); articles 12 and 29 of the Convention on International Civil Aviation, 61 Stat. 1180.

### Amendments

[Docket 18334, 54 FR 34311, Aug. 18, 1989, as amended by Amdt. 91-267, 66 FR 21066, Apr. 27, 2001; Amdt. 91-269, 66 FR 41116, Aug. 6, 2001]