Airworthiness Directives; The Boeing Company Model 757 Airplanes

Résumé

We propose to adopt a new airworthiness directive (AD) for the products listed above. For certain airplanes, this proposed AD would require the installation of new relays adjacent to two of the spoiler control modules that would prevent the deployment of certain spoiler pairs when landing flaps are selected. For certain other airplanes, this proposed AD would require torquing the bracket assembly installation nuts and ground stud nuts, and doing bond resistance tests between the bracket assemblies and the terminal lugs on the ground studs. This proposed AD is prompted by numerous reports of unintended lateral oscillations during the final approach, just before landing. We are proposing 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 flight crew and passengers.