49 CFR § 821.21 - Official notice.

---
identifier: "/us/cfr/t49/s821.21"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 821.21 - Official notice."
title_number: 49
title_name: "Transportation"
section_number: "821.21"
section_name: "Official notice."
chapter_name: "NATIONAL TRANSPORTATION SAFETY BOARD"
part_number: "821"
part_name: "RULES OF PRACTICE IN AIR SAFETY PROCEEDINGS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 1101-1155, 44701-44723, 46301, Pub. L. 112-153, unless otherwise noted."
regulatory_source: "68 FR 22625, Apr. 29, 2003, unless otherwise noted."
cfr_part: "821"
---


# 821.21 Official notice.

Where a law judge or the Board intends to take official notice of a material fact not appearing in the evidence in the record, notice shall be given to all parties, who may within 10 days file a petition disputing that fact.