ATC transponder

For ATC transponder, interval is within the preceding 24 calendar months; applies to is ATC transponder that is specified in 91.215(a), 121.345(c), or § 135.143(c) of this chapter; consequence if lapsed is No persons may use an ATC transponder; regulation section is § 91.413, verified against its source on 2026-08-06.

Inspection or test item: ATC transponder verified
Interval: within the preceding 24 calendar months verified
Applies to: ATC transponder that is specified in 91.215(a), 121.345(c), or § 135.143(c) of this chapter verified
Consequence if lapsed: No persons may use an ATC transponder verified
Regulation section: § 91.413 verified

Sourceecfr.gov

Verified2026-08-06

Review by2028-08-05

DatasetAircraft inspection and test intervals under 14 CFR Part 91

What the source says

No persons may use an ATC transponder that is specified in 91.215(a), 121.345(c), or § 135.143(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 of this chapter; and

— ecfr.gov, retrieved 2026-08-06

Source

ecfr.govhttps://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.413

Last verified against source: 2026-08-06. Due for re-check by 2028-08-05. This page as Markdown · OKF bundle · full dataset as JSON.