Airworthiness Directive · Amendment 39-11512 · Boeing Model 777 Series Airplanes
Boeing Model 777 Series Airplanes
Model 777 series airplanes, as listed in Boeing Service Bulletin 777-57A0029, Revision 1, dated August 12, 1999; certificated in any category.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 777 series airplanes, that requires the replacement of fuse pins in the attachment fittings and support fittings of the main landing gear with new, improved fuse pins. This amendment is prompted by a report of corrosion of a fuse pin of a similar design on the main landing gear of a Boeing Model 767 series airplane. The actions specified by this AD are intended to prevent corrosion and subsequent fracture of the fuse pins, which could result in collapse of the main landing gear and the loss of the inboard flap and spoilers.
Required as indicated, unless accomplished previously.
To prevent corrosion and subsequent fracture of the fuse pins in the main landing gear attachment and support fittings, which could result in collapse of the main landing gear and the loss of the inboard flap and spoilers, accomplish the following:
Replacement
(a) Within 48 months since date of manufacture, or 18 months after the effective date of this AD, whichever occurs later, replace the main landing gear fuse pins with new, improved fuse pins in accordance with Boeing Alert Service Bulletin 777-57A0029, dated December 22, 1998; or Boeing Service Bulletin 777-57A0029, Revision 1, dated August 12, 1999.
Spares
(b) As of the effective date of this AD, no person shall install a main landing gear fuse pin having part number 112W1728-1, 112W1728-3, or 115W1670-1 on any airplane.
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.
Aircraft
