Boeing has confirmed that "blanking" of Honeywell Phase 3 Display Units (DUs) has been reported during airline EMI (electro magnetic interference) certification testing of wireless broadband systems (Wi-Fi) on various Boeing737NG airplanes.

Boeing, meanwhile, says: "Current testing by Boeing and Honeywell has determined that blanking may occur when a DU is subjected to testing procedures specified by the FAA requirements (AC-20-164) during installations of Wi-Fi systems on the airplane. Based on testing that has been conducted, Boeing and Honeywell have concluded that actual EMI levels experienced during normal operation of typical passenger Wi-Fi systems would not cause any blanking of the Phase 3 DU. This issue does not exist with the Phase 1 or 2 DU's."