A recent update that becomes active on March 29 includes editorial updates to the bank of sample questions that the FAA releases for each of the primary certification and rating levels: private, instrument, commercial, flight instructor, and airline transport pilot for airplanes, rotorcraft, and gliders. Those changes will be followed by a more in-depth update planned for June 28, later this year. Pilots and instructors can also anticipate an update to the Airplane Flying Handbook in June 2021, and to the Pilot’s Handbook of Aeronautical Knowledge in September 2022. An addendum to the PHAK was released on February 10, 2021, explicitly stating that because marijuana remains an illegal drug at the federal level, its use is prohibited by pilots and other FAA certificate holders.