revisions to operational requirements for the use of enhanced flight vision systems efvs and to pilot compartment view requirements for vision systems 52 pages in english preprior to this final rule persons could only use an enhanced flight vision system efvs in lieu of natural vision to descend below the decision altitude decision height or minimum descent altitude da dh or mda down to 100 feet above the touchdown zone elevation tdze using certain straight-in landing instrument approach procedures iaps . this final rule permits operators to use an efvs in lieu of natural vision to continue descending from 100 feet above the tdze to the runway and to land on certain straight-in iaps under instrument flight rules ifr . this final rule also revises and relocates the regulations that permit operators to use an efvs in lieu of natural vision to descend to 100 feet above the tdze using certain straight-in iaps. additionally this final rule addresses provisions that permit operators who conduct efvs operations under parts 121 125 or 135 to use efvs-equipped aircraft to dispatch release or takeoff under ifr and revises the regulations for those operators to initiate and continue an approach when the destination airport weather is below authorized visibility minimums for the runway of intended landing. this final rule establishes pilot training and recent flight experience requirements for operators who use efvs in lieu of natural vision to descend below the da dh or mda. efvs-equipped aircraft conducting operations to touchdown and rollout are required to meet additional airworthiness requirements. this final rule also revises pilot compartment view certification requirements for vision systems using a transparent display surface located in the pilots outside field of view. the final rule takes advantage of advanced vision capabilities thereby achieving the next generation air transportation system nextgen goals of increasing access efficiency and throughput at many airports when low visibility is the limiting factor. additionally it enables efvs operations in reduced visibilities on a greater number of approach procedure types while maintaining an equivalent level of safety. pre