Airworthiness Directive · Amendment 39-18137 · Flight controls
The Boeing Company Airplanes
Superseded. A later AD replaced this one: AD 2017-26-10. Comply with the one in force.
This AD applies to The Boeing Company Model 757-200, -200PF, -200CB, and -300 series airplanes; certificated in any category; as identified in Boeing Service Bulletin 757-27A0152, Revision 3, dated October 28, 2013, as revised by Boeing Service Bulletin 757-27A0152, Revision 4, dated August 26, 2014.
We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 757-200, -200PF, -200CB, and -300 series airplanes. This AD was prompted by numerous reports of unintended lateral oscillations during final approach, just before landing. This AD requires, depending on airplane configuration, installing new relays and bracket assemblies, inspecting to ensure that the new relays do not contact adjacent wire bundles, torquing the bracket assembly installation nuts and ground stud nuts, doing bond resistance tests between the bracket assemblies and the terminal lugs on the ground studs, and related investigative and corrective actions if necessary. We are issuing this AD to reduce the chance of unintended lateral oscillations near touchdown, which could result in loss of lateral control of the airplane, and consequent airplane damage or injury to flightcrew and passengers.
Within 60 months after the effective date of this AD, do the applicable actions specified in paragraph (g)(1), (g)(2), or (g)(3) of this AD.
(1) For Configuration 1 airplanes defined in Boeing Service Bulletin 757-27A0152, Revision 3, dated October 28, 2013, as revised by Boeing Service Bulletin 757-27A0152, Revision 4, dated August 26, 2014: Install three bracket assemblies and three new relays, and make changes to the wire bundles, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-27A0152, Revision 3, dated October 28, 2013, as revised by Boeing Service Bulletin 757-27A0152, Revision 4, dated August 26, 2014.
(2) For Configuration 2 airplanes defined in Boeing Service Bulletin 757-27A0152, Revision 3, dated October 28, 2013, as revised by Boeing Service Bulletin 757-27A0152, Revision 4, dated August 26, 2014: Torque the bracket assembly nuts and ground stud nuts, do bond resistance tests to verify that bonding requirements are met, do a general visual inspection to ensure that the three new relays do not touch the adjacent wire bundles, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-27A0152, Revision 3, dated October 28, 2013, as revised by Boeing Service Bulletin 757-27A0152, Revision 4, dated August 26, 2014. Do all applicable related investigative and corrective actions before further flight.
(3) For Configuration 3 airplanes defined in Boeing Service Bulletin 757-27A0152, Revision 3, dated October 28, 2013, as revised by Boeing Service Bulletin 757-27A0152, Revision 4, dated August 26, 2014: Do a general visual inspection to ensure that the three new relays do not touch the adjacent wire bundles, and do all applicable related investigative and corrective actions, in accordance with the Accomplishment Instructions of Boeing Service Bulletin 757-27A0152, Revision 3, dated October 28, 2013, as revised by Boeing Service Bulletin 757-27A0152, Revision 4, dated August 26, 2014. Do all applicable related investigative and corrective actions before further flight.
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.
