; and (C) maintain consistency with the acquisition management system established and updated pursuant to section 40110(d) of title 49, United States Code. (4) Progress updates The Administrator shall provide the appropriate committees of Congress with semiannual updates through September 30, 2028 on the progress made in carrying out the plan under paragraph (1). (5) Inspector general review (A) In general Not later than 3 years after the Administrator develops the plan required under paragraph (1), the inspector general of the Department of Transportation shall assess such efforts of the Administration to drawdown, replace, or enhance any legacy systems identified under subsection (a). (B) Report The inspector general shall submit to the appropriate committees of Congress a report on the results of the review carried out under subparagraph (A). (f) Definitions In this section: (1) Industry The term industry means aviation industry organizations with expertise in aviation-dedicated network systems, systems engineering platforms, aviation software services, air traffic management, flight operations, and International Civil Aviation Organization standards. (2) Legacy system The term legacy system means any communication, navigation, surveillance, or automation or network applications or ground-based aviation infrastructure, or other critical software and hardware systems owned by the FAA, that were deployed prior to the year 2000, including the Notice to Air Missions system. (3) Outdated, insufficient, unsafe, or unstable legacy system The term outdated, insufficient, unsafe, or unstable legacy system means a legacy system for which the likelihood of failure of such system creates a risk to air safety or security due to the age, ability to be maintained in a cost-effective manner, vulnerability to degradation, errors, or malicious attacks of such system, or any other factors that may compromise the performance or security of such system, including a legacy system— (A) that is vulnerable or susceptible to mechanical