[Code of Federal Regulations] [Title 49, Volume 7] [Revised as of October 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 49CFR821.21] [Page 167] TITLE 49--TRANSPORTATION CHAPTER VIII--NATIONAL TRANSPORTATION SAFETY BOARD PART 821_RULES OF PRACTICE IN AIR SAFETY PROCEEDINGS--Table of Contents Subpart B_General Rules Applicable to Petitions for Review, Appeals to the Board, and Appeals From Law Judges Initial Decisions and Appealable Orders Sec. 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.