MIDDLETOWN, CT -- The F-35 program is approaching its first wave of scheduled engine maintenance in 2023, and in preparation, engine-maker Pratt & Whitney is readying its architecture and processes for what the company views as a test of whether the engine sustainment enterprise is positioned to maintain readiness as it takes on additional workload. The forthcoming scheduled depot work -- which is slated to begin at least two years later than previous projections due to lower aircraft utilization rates...