49 CFR §800.43

1. (a)Unless the NTSB otherwise specifies, no public hearing, argument, or other proceeding is held directly on a petition before its disposition under this section.
2. (b)Grants. If the agency determines the petition contains adequate justification, it initiates rule making action this subpart.
3. (c)Denials. If the agency determines the petition does not justify rulemaking, it denies the petition.
4. (d)Notification. Whenever the agency determines a petition should be granted or denied, the Office of the General Counsel prepares a notice of the grant or denial for issuance to the petitioner, and the agency issues it to the petitioner.