 On March 23, 2000, the FAA issued Amendments 91–263, 121–273, and 135-75 (Correction 135.154).These amendments amended the operating rules to require that all U.S. registered turbine-powered airplanes with six or more passenger seats (exclusive of pilot and copilot seating) be equipped with an FAA-approved TAWS.The mandate only affects aircraft manufactured after March 29, 2002.