Airworthiness Directive · Amendment 39-18623 · Landing gear
The Boeing Company Airplanes
This AD applies to all The Boeing Company Model 777-200, 777-200LR, 777-300, 777-300ER, and 777F series airplanes, certificated in any category.
We are adopting a new airworthiness directive (AD) for all The Boeing Company Model 777 airplanes. This AD was prompted by a report of an incident involving a landing in which the pilots needed to input corrections due to airplane yaw and roll to the right; the main landing gear (MLG) aft trunnion pin was later found to be fractured. This AD requires identification and replacement of certain MLG aft trunnion pins. We are issuing this AD to prevent a fractured MLG aft trunnion pin, which could result in collapse of the MLG and consequent loss of control of the airplane during landing.
For airplanes on which the original airworthiness certificate or the original export certificate of airworthiness was issued on or before the effective date of this AD: Within 36 months after the effective date of this AD, identify the serial number and marking of the MLG aft trunnion pins, in accordance with Part 1 of the Accomplishment Instructions of Boeing Alert Service Bulletin 777-32A0103, Revision 1, dated December 10, 2015.
For any MLG aft trunnion pin that begins with serial number “EGL” or “MAL,” on which no “BASE METAL INSPECTED” marking is found, replace with a new or serviceable MLG aft trunnion pin within 36 months after the effective date of this AD, in accordance with Part 2 of the Accomplishment Instructions of Boeing Alert Service Bulletin 777-32A0103, Revision 1, dated December 10, 2015.
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.
