Full FAA Chronology at this link.
19740102: Public Law 93-239, enacted on this date, extended the deadline for installation of emergency locator transmitters (ELTs) in certain types of aircraft from December 30, 1973, to June 30, 1974. The law also added certain new categories of operation, such as flights incident to design and testing, to the list of exceptions to the ELT requirement. (See December 29, 1970, and March 16, 1978.)
19970102: The Federal Aviation Administration (FAA) issued an airworthiness directive requiring operators to adopt procedures enabling the flight crew to reestablish control of a Boeing 737 experiencing an uncommanded yaw or roll – the phenomenon believed to have brought down USAir Flight 427 at Pittsburgh, Pennsylvania, in 1994. Pilots were told to lower the nose of their aircraft, maximize power, and not attempt to maintain assigned altitudes. (See August 22, 1996; January 15, 1997.)
20130102: Garmin announced it had received FAA’s technical standard order (TSO) authorization and approved model list supplemental type certificate (AML STC) approval for the GDL 88 series, the industry’s first dual-link ADS-B solution for certified aircraft. With these certifications, FAA approved the GDL 88 for installation on most Part 23 fixed-wing aircraft. The dual-link capability allowed the GDL 88 to receive both the 978 MHz UAT and 1090 MHz frequency bands. (See March 14, 2011; April 4, 2013.)