14 CFR § 406.157 - Expert or opinion witnesses.

---
identifier: "/us/cfr/t14/s406.157"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "14 CFR § 406.157 - Expert or opinion witnesses."
title_number: 14
title_name: "Aeronautics and Space"
section_number: "406.157"
section_name: "Expert or opinion witnesses."
chapter_name: "COMMERCIAL SPACE TRANSPORTATION, FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "B"
subchapter_name: "PROCEDURE"
part_number: "406"
part_name: "INVESTIGATIONS, ENFORCEMENT, AND ADMINISTRATIVE REVIEW"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "51 U.S.C. 50901-50923."
regulatory_source: "Docket No. FAA-2001-8607, 66 FR 2180, Jan. 10, 2001, unless otherwise noted."
cfr_part: "406"
---


# 406.157 Expert or opinion witnesses.

An employee of the FAA may not be called as an expert or opinion witness for any party other than the agency, in any proceeding governed by this part. An employee of a respondent may not be called as an expert or opinion witness for the complainant in any proceeding governed by this part to which the respondent is a party.