14 CFR § 13.223 - Standard of proof.

---
identifier: "/us/cfr/t14/s13.223"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 13.223 - Standard of proof."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "13.223"
section_name: "Standard of proof."
chapter_name: "FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "B"
subchapter_name: "PROCEDURAL RULES"
part_number: "13"
part_name: "INVESTIGATIVE AND ENFORCEMENT PROCEDURES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "18 U.S.C. 6002; 28 U.S.C. 2461 note; 49 U.S.C. 106(g), 5121-5124, 40113-40114, 44103-44106, 44701-44704, 44709-44710, 44713, 44725, 44742, 44802 (note), 46101-46111, 46301, 46302 (for a violation of 49 U.S.C. 46504), 46304-46316, 46318-46320, 46501-46502, 46504, 46507, 47106, 47107, 47111, 47122, 47306, 47531-47532; 49 CFR 1.83."
regulatory_source: "Docket No. 18884, 44 FR 63723, Nov. 5, 1979, unless otherwise noted."
cfr_part: "13"
---


# 13.223 Standard of proof.

The administrative law judge must issue an initial decision or must rule in a party's favor only if the decision or ruling is supported by, and in accordance with, the reliable, probative, and substantial evidence contained in the record. In order to prevail, the party with the burden of proof must prove the party's case or defense by a preponderance of reliable, probative, and substantial evidence.