Regulacje i polityka gospodarcza · 22/11/1996

Airworthiness Directives; Boeing Model 737 Series Airplanes

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) T96-23-51 that was sent previously to all known U.S. owners and operators of Boeing Model 737 series airplanes by individual telegrams. This AD requires repetitive tests to verify proper operation of the rudder power control unit (PCU), and replacement of the PCU, if necessary. This amendment is prompted by tests of the main rudder PCU, conducted by the manufacturer, which demonstrated a potential failure scenario that was previously unknown. The actions specified by this AD are intended to prevent rudder motion in the opposite direction of the rudder command.