Summary
This document revises an earlier proposed airworthiness directive (AD), applicable to certain Boeing Model 747-100, -200, -300, and SP series airplanes, that would have required revising the Airplane Flight Manual (AFM) to prohibit the use of the autoland function. That proposal would have also required installation of a diode and a marker on certain shelves and making wiring changes to the flight mode annunciator of the autopilot/flight director system, which would have terminated the requirements for the AFM limitation. That proposal was prompted by a report that the flightcrew was unaware of the configuration of the autoland system during landing. This action revises the proposed rule by revising the applicability to include additional airplanes. The actions specified by this proposed AD are intended to ensure flightcrew awareness of the configuration of the autoland system in the event of a change from fail-operational to fail- passive mode.