Airworthiness Directive · Amendment 39-11530 · Boeing Model 777-200 Series Airplanes
Boeing Model 777-200 Series Airplanes
Model 777-200 series airplanes, as listed in Boeing Service Bulletin 777-57-0033, including Appendix A, both dated March 26, 1998, certificated in any category.
Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (b) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.
This amendment adopts a new airworthiness directive (AD), applicable to certain Boeing Model 777-200 series airplanes, that requires the application of sealant to the upper surface on the wing center section to ensure the integrity of the secondary fuel barrier. This amendment is prompted by reports from the airplane manufacturer that the sealant was inadvertently not applied to portions of the wing center section on certain Boeing Model 777-200 series airplanes. The actions specified by this AD are intended to prevent fuel or fuel vapors from entering the cargo and passenger compartments in the event of a failure of the primary seal or development of a crack in the wing center section structure. Leakage of fuel or fuel vapors into the cargo and passenger compartments could be hazardous to personnel, and could cause a fire in those compartments.
To prevent fuel or fuel vapors from entering the passenger and cargo compartments of the airplane in the event of a failure of the primary seal or development of a crack in the wing center section structure, accomplish the following:
(a) Within 24 months after the effective date of this AD, apply sealant to the upper surface on the wing center section under the overwing stub beams on the left and right sides of the airplane, in accordance with Boeing Service Bulletin 777-57-0033, dated March 26, 1998.
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
