The Air Force could request proposals from industry in the second quarter of fiscal year 2018 for a two-step B-52 engine replacement effort, according to a notional schedule released last week. The document, briefed during a Dec. 12 industry day , lays out a schedule for a two-step contracting approach through which the Air Force would contract with an aircraft integration contractor to develop an integration plan and identify qualified vendors to work with the integrator to develop their approaches...