Tagaircraft(260)

FAA Order JO 7110.659C, effective February 29, 2016, updates air traffic control procedures for Wake Turbulence Recategorization (Recat), which changes how aircraft are grouped for safe separation purposes. Instead of the traditional three weight classes (heavy, large, and small), Recat introduces six categories based on wingspan, takeoff weight, and an aircraft's ability to withstand wake turbulence, allowing for more precise separation distances and improved airport efficiency. Facilities must obtain authorization, train personnel, and submit weekly wake encounter reports for the first eight weeks after implementing these new procedures.

This FAA Advisory Circular (AC 36-1H) published in 2001 and updated in 2012 provides official noise level data for U.S.-certificated and foreign aircraft, including turbojet and propeller-driven planes tested under 14 CFR Part 36 and ICAO Annex 16 standards. Noise measurements, expressed in Effective Perceived Noise Levels (EPNdB), cover takeoff, sideline, and approach conditions and are organized across multiple appendices by aircraft type and compliance stage. The document serves as a reference for tracking progress in aircraft noise reduction and supports noise policy decisions at airports across the United States.

A European study called RANCH examined how aircraft and road traffic noise affects reading comprehension and attention in nearly 3,000 children aged 9-10 in the UK, Netherlands, and Spain. Results showed that higher aircraft noise exposure was significantly linked to poorer reading comprehension, while road traffic noise showed no such effect; neither type of noise impacted sustained attention. The findings suggest aircraft noise poses a greater risk to children's cognitive development than road traffic noise, with implications for school siting and noise exposure policies near airports.