Airworthiness Directive · Amendment 39-17853 · Flight controls
The Boeing Company Airplanes
This AD applies to The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes, certificated in any category, as identified in Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 777-200, -200LR, -300, and -300ER series airplanes. This AD was prompted by reports of severe corrosion on bonding jumpers installed on the flight control surfaces. This AD requires repetitive bonding jumper inspections for corrosion, sealant disbond, and insufficient sealant coverage; and corrective actions if necessary. This AD also specifies an optional inspection for corrosion damage of the bonding brackets, and corrective actions if necessary, which would terminate the repetitive inspections. For certain airplanes, this AD requires installing certain bonding jumpers, and replacing single-tabbed brackets with two-tabbed brackets. We are issuing this AD to detect and correct corrosion on bonding jumpers installed on the flight control surfaces, which, in the event of a lightning strike, could damage the actuator control electronics (ACEs) and result in the loss of the ability to command individual flight control surfaces or cause uncommanded motion of individual flight control surfaces.
At the applicable compliance time specified in paragraph 1.E., “Compliance,” of Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013, except as specified in paragraphs (j)(1) and (j)(2) of this AD: Do a general visual inspection or a detailed inspection, including a borescopic inspection as applicable, for corrosion, sealant disbond, and insufficient sealant coverage of bonding jumpers; and do all applicable corrective actions; in accordance with Option 1, and Option 2, as applicable, of the Accomplishment Instructions of Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013, except as required by paragraph (j)(3) of this AD. Do a detailed inspection using a borescope of bonding jumper 10 if the horizontal stabilizer tips have not been removed. Do all applicable corrective actions before further flight. Repeat the inspection thereafter at intervals not to exceed 1,500 days. Doing the actions specified in paragraph (h)(1) of this AD on a bonding jumper terminates the repetitive inspections required by this paragraph. Doing the actions specified in paragraph (h)(2) of this AD terminates repetitive inspections required by this paragraph for that bonding jumper.
(1) Doing a general visual inspection or a detailed inspection for corrosion damage of the bonding jumper brackets, replacing bonding jumpers, and all applicable corrective actions; in accordance with Option 2 of the Accomplishment Instructions of Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013; terminates the repetitive inspections required by paragraph (g) of this AD. Do all applicable corrective actions before further flight.
(2) The repetitive inspections required by paragraph (g) of this AD are not required on the bonding jumpers that were removed, inspected, and replaced with new bonding jumpers and new fasteners using the new category 2 fay sealed direct standard ground stud installation method, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013.
(1) For Group 1 airplanes, as identified in Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013: Prior to or concurrently with accomplishing the actions required by paragraph (g) of this AD, install new bonding jumpers, and do resistance measurements of the modified installation to verify resistance is within the limits specified in the Accomplishment Instructions of Boeing Service Bulletin 777-55A0010, Revision 1, dated April 17, 2001. Do the actions in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-55A0010, Revision 1, dated April 17, 2001.
Note 1 to paragraph (i)(1) of this AD: AD 2012-08-13, Amendment 39-17030 (77 FR 24357, April 24, 2012), refers to Boeing Service Bulletin 777-55A0010, Revision 1, dated April 17, 2001, as the appropriate source of service information for accomplishing the actions specified in paragraph (h) of AD 2012-08-13.
(2) For Group 1 and Group 2 airplanes, as identified in Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013: Prior to or concurrently with accomplishing the actions required by paragraph (g) of this AD, replace certain single-tabbed bonding brackets in the airplane empennage with two-tabbed bonding brackets, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 777-55A0014, Revision 1, dated April 1, 2010.
Note 2 to paragraph (i)(2) of this AD: AD 2012-08-13, Amendment 39-17030 (77 FR 24357, April 24, 2012), refers to Boeing Service Bulletin 777-55A0014, Revision 1, dated April 1, 2010, as the appropriate source of service information for accomplishing the actions specified in paragraph (g) of AD 2012-08-13.
(1) Where Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013, specifies a compliance time after the “Original issue date of this service bulletin,” this AD requires compliance within the specified compliance time after the effective date of this AD.
(2) The “Condition” column in paragraph 1.E., “Compliance,” of Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013, refers to a condition as of the “Original Issue date of this service bulletin.” This AD applies to the corresponding condition as of the effective date of this AD.
(3) If any corrosion damage is found during any inspection required by this AD, and Boeing Service Bulletin 777-27A0078, Revision 1, dated April 1, 2013, specifies to contact Boeing for appropriate action: Before further flight, repair the corrosion damage using a method approved in accordance with the procedures specified in paragraph (l) of this AD.
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
