---
kind: "section"
citation: "14 C.F.R. § 99.17"
title: "14"
number: "99.17"
heading: "Deviation from flight plans and ATC clearances and instructions."
url: "https://uscodex.org/cfr/14/99.17"
---

# §99.17. Deviation from flight plans and ATC clearances and instructions.

- (a) No pilot may deviate from the provisions of an ATC clearance or ATC instruction except in accordance with [§ 91.123](/cfr/14/91.123.md) of this chapter.
- (b) No pilot may deviate from the filed IFR flight plan when operating an aircraft in uncontrolled airspace unless that pilot notifies an appropriate aeronautical facility before deviating.
- (c) No pilot may deviate from the filed DVFR flight plan unless that pilot notifies an appropriate aeronautical facility before deviating.

## Notes

### Amendments

[69 FR 16756, Mar. 30, 2004]

### Authority

Authority: 49 U.S.C. 106(g), 40101, 40103, 40106, 40113, 40120, 44502, 44721.

### Source

Source: Docket 25113, 53 FR 18217, May 20, 1988, unless otherwise noted.

### Amendments

[69 FR 16756, Mar. 30, 2004]