Airworthiness Directive · Amendment 39-13178 · Boeing Model 727-100 and 727-200 Series Airplanes
Boeing Model 727-100 and 727-200 Series Airplanes
Model 727-100 and 727-200 series airplanes, certificated in any category, as listed in Boeing Alert Service Bulletin 727-22A0093, dated December 20, 2000; excluding airplanes equipped with radio altimeter-based autopilots.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 727-100 and 727-200 series airplanes, that requires, under certain conditions, replacement of the installed autopilot pitch control computer with a modified computer, testing of the modified system, and revision of the Airplane Flight Manual (AFM). The actions specified by this AD are intended to prevent undesirable and potentially dangerous pitch oscillations during coupled instrument landing system (ILS) approaches. This AD is intended to address the identified unsafe condition.
