Pentagon Delays F-35 Deliveries Due to Technical Issues.

Newly built F-35 Joint Strike Fighters equipped with Tech Refresh 3 (TR-3) hardware will not be accepted by the US government until ongoing testing for the system is completed, according to the F-35 Joint Program Office. The TR-3 system provides the computing backbone to enable Block 4, a suite of new capabilities for the Joint Strike Fighter. The F-35 program planned to have TR-3 available by April 2023, putting plans about a year behind the current schedule. The F-35 program also separately paused deliveries recently due to a vibration issue known as harmonic resonance in the fighter’s engine.