"SUMMARY: We are adopting a new airworthiness directive (AD) for all The Boeing
Company Model 737-600, -700, -700C, -800, -900, and -900ER series airplanes, and
Model 777 airplanes. This AD was prompted by testing reports on certain Honeywell
phase 3 display units (DUs). These DUs exhibited susceptibility to radio frequency
emissions in WiFi frequency bands at radiated power levels below the levels that the
displays are required to tolerate for certification of WiFi system installations. The phase 3
DUs provide primary flight information including airspeed, altitude, pitch and roll
attitude, heading, and navigation information to the flightcrew. This AD requires
replacing the existing phase 3 DUs with phase 1, phase 2, or phase 3A DUs, and for
certain replacement DUs, installing new DU database software. We are issuing this AD
to prevent loss of flight-critical information displayed to the flightcrew during a critical
phase of flight, such as an approach or takeoff, which could result in loss of airplane
control at an altitude insufficient for recovery, or controlled flight into terrain. "
https://s3.amazonaws.com/public-insp...2014-23231.pdf