---
kind: "section"
citation: "14 C.F.R. § 21.217"
title: "14"
number: "21.217"
heading: "Duration."
url: "https://uscodex.org/cfr/14/21.217"
---

# §21.217. Duration.


Unless sooner surrendered, superseded, revoked, or otherwise terminated, provisional airworthiness certificates are effective for the duration of the corresponding provisional type certificate, amendment to a provisional type certificate, or provisional amendment to the type certificate.


## Notes

### Source

Source: Docket No. 5085, 29 FR 14571, Oct. 24, 1964, unless otherwise noted.

### Authority

Authority: 42 U.S.C. 7572; 49 U.S.C. 106(f), 40105, 40113, 44701-44702, 44704, 44707, 44709, 44711, 44713, 44715, 45303.