Airworthiness Directive · Amendment 39-9904 · The Boeing Company Airplanes
The Boeing Company Airplanes
This AD applies to The Boeing Company 757-200 Series, 757-200CB Series, 757-200PF Series, 757-300 Series, 767-200 Series, 767-300 Series, 767-300F Series.
The models as the FAA's AD index lists them. The serial ranges, installed parts and exceptions are in the AD itself: read it at the FAA.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 757 and 767 series airplanes, that requires replacement of the thrust management computer (TMC) with a new TMC. This amendment is prompted by reports indicating that an uncommanded advancement of the throttle levers occurred; this condition was apparently due to a high impedance connection to the excitation phase of the servo motor. The actions specified by this AD are intended to prevent an uncommanded runaway of the autothrottle during flight or ground operations as a result of problems associated with the TMC, which could distract the crew from normal operation of the airplane or lead to an unintended speed or altitude change.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
