Honeywell Mods Fix Mode-S Transponders
A fix has been ordered to resolve the five-second trap of certain Honeywell mode-S transponders. The affected units erroneously go into standby mode if the crew takes longer than five seconds to change codes when using the rotary knob of the radio management unit. Effective October 17, an AD requires insertion of a warning into the AFM and modifications to the transponder. In some cases, replacement of the transponders is mandated.