14 CFR § 399.4 - Nature and effect of policy statements.
---
identifier: "/us/cfr/t14/s399.4"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 399.4 - Nature and effect of policy statements."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "399.4"
section_name: "Nature and effect of policy statements."
chapter_name: "OFFICE OF THE SECRETARY, DEPARTMENT OF TRANSPORTATION (AVIATION PROCEEDINGS)"
subchapter_number: "F"
subchapter_name: "POLICY STATEMENTS"
part_number: "399"
part_name: "STATEMENTS OF GENERAL POLICY"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 40113(a), 41712, 46106, 46107, and 42305."
regulatory_source: "PS-21, 29 FR 1446, Jan. 29, 1964, unless otherwise noted."
cfr_part: "399"
---
# 399.4 Nature and effect of policy statements.
Policy statements published in this part will be observed by the Department until rescinded, but any policy may be amended from time to time as experience or changing conditions may require. Changes in policy may be made with or without advance notice to the public and will become effective upon publication in the *Federal Register* unless otherwise provided. If it appears to the Department, in its consideration of any matter before it, that the application of a policy published in this part would run counter to an express provision of law or policy enunciated by Congress in 49 U.S.C., the published policy shall not be applicable to such matter.
[PS-21, 29 FR 1446, Jan. 29, 1964, as amended by Doc. No. DOT-OST-2014-0140, 84 FR 15947, Apr. 16, 2019]