
The F-35 Joint Program Office (JPO) has directed a fleetwide retrofit for Lockheed Martin [LMT] F-35As, Bs, and Cs to mitigate any future "harmonic resonance," which may increase stress on the fighter's Raytheon Technologies' [RTX] F135 engine. "While only a small number of aircraft were impacted by the 'harmonic resonance,' the plan is to retrofit the entire fleet, because the retrofit is inexpensive, non-intrusive and supports the JPO’s desire to maintain and manage a single configuration across the entire fleet,"…