This advisory circular (AC) describes an acceptable means for demonstrating
compliance with Title 14, Code of Federal Regulations (14 CFR) 33.15 for aircraft
engine parts with materials produced by the powder bed fusion (PBF) additive
manufacturing (AM) process. Guidance is also p

This policy statement provides additional Federal Aviation Administration (FAA) guidance on
demonstrating electromagnetic compatibility (EMC) for wireless radio frequency (RF) systems
that are installed on transport category airplanes. RF systems include portable wireless RF
transmitters and receivers carried onboard by passengers, crewmembers, and in baggage or
cargo, and installed wireless RF devices that communicate with other RF devices. Installed
wireless RF systems use standards such as, but not limited to, Bluetooth, Wi-Fi, or mobile
telephony. This policy statement defines an acceptable means for demonstrating compliance with
Title 14, Code of Federal Regulation (14 CFR) part 25 airworthiness regulations.
This policy does not apply to installed airplane radio systems that intentionally communicate
with radios outside the airplane, such as those that communicate with satellites, ground stations,
and radios in other airplanes.

This notice provides information to aviation safety inspectors (ASI)
on diesel exhaust fluid (DEF) contaminations of aircraft and outlines the procedures ASIs are to
use after an incident has occurred. This notice also alerts and advises ASIs and foreign Civil
Aviation Authorities (CAA) of events in which aircraft were refueled with jet fuel contaminated
with DEF or were serviced with refueling equipment that was exposed to DEF.

This notice provides guidance regarding policy revisions to the
initial certification process for a Title 14 of the Code of Federal Regulations (14 CFR) part 135
single-pilot applicant.