Recently the NTSB added five new conditions that require immediate notification upon occurrence.  The following paragraph summarizes these changes.

This amendment revises the rule in three ways.  First, editorial changes were made to the existing rule language for clarity.  Second, the references to the phone books were replaced with a Web site reference that contains NTSB contact information. Thirdly, five new conditions to include propeller blade release, loss of information from cockpit displays, Airborne Collision and Avoidance System (ACAS) resolution advisories issued, damage to helicopter tail or main rotor blades, and events involving air carrier aircraft that land or depart on a taxiway, incorrect runway, or other area not designed as a runway, or runway incursions, were added to the immediate notification section of the regulation. Review the amendment, Title 49 of the Code of Federal Regulations (49 CFR) part 830, for details of the changes.  http://edocket.access.gpo.gov/2010/pdf/E9-30398.pdf