This document defines design guidance and certification recommendations for aircraft tolerance to interference from portable electronic devices. The aircraft design guidance and certification recommendations address all portable electronic devices@ including transmitting portable electronic devices. The document recommends specific interference path loss targets for aircraft to mitigate the effects of PED spurious emissions on aircraft radio receivers. The report recommends specific RF immunity requirements for aircraft systems that are exposed to PED intentional RF transmissions. For aircraft that successfully meet the recommendations in this report@ aircraft operators will have high assurance that the PEDs will not interfere with aircraft systems even in critical phases of flight. The recommendations are independent of class of aircraft; they can be applied to small and large airplanes@ and small and large rotorcraft. This document does not recommend mandatory certification requirements for PED interference tolerance. It does provide standard requirements for interference path loss and aircraft system immunity that can be used to demonstrate PED tolerance as part of aircraft certification.