Since the end of the 1950s, aircraft operators, aircraft manufacturers, and regulatory authorities have been concerned with the potential for interference with aircraft electrical and electronic systems by portable electronic devices carried on board by passengers and crewmembers. RTCA established five committees: 1) RTCA SC-88 was the earliest, publishing their study and recommendations in RTCA DO-119 in 1963 [Ref 1], 2) RTCA SC-156 published RTCA DO-199 in 1988 [Ref 3], 3) RTCA SC-177 published RTCA DO-233 in 1996 [Ref 4]. 4) RTCA SC-202 published RTCA DO-294C and DO-307 along with Change 1 to DO-307, and 5) the most recent, RTCA SC-234 publishing Rev A to DO-307 and an accompanying users guide.