The Block 4 F-35 Fighter Has the Makings of a 'Stealth' Classic

The F-35 Lightning II is set for significant improvements with the Block 4 upgrade, enhancing its electronic hardware, software, and core processor as part of Technology Refresh 3 (TR-3). Though TR-3 faced delays, a "truncated" version has now been approved, allowing F-35 deliveries to resume. Additionally, Pratt & Whitney's F135 Engine Core Upgrade (ECU) promises increased durability and performance for all F-35 variants, aiming for a $40 billion lifecycle cost saving.

See the full article at stlbeacon.org