Boeing 737s need new wiring to make sure the autopilot works correctly

The US aviation regulator is ordering changes to certain Boeing 737-300 and -400 series airplanes. This means airlines must replace specific wire bundles and a housing assembly, and remove a mechanical part from the aileron system.

A small wiring issue could prevent the autopilot from detecting when a spoiler isn't deflecting enough. This could lead to a situation where the autopilot thinks everything is fine, even if a flight control surface isn't working as intended. The fix ensures the plane's systems can properly monitor flight controls and engage the autopilot's safety features.