Electrical and data-system upgrades ordered for Marine Corps H-1 helicoptersNewsDan Taylor Technology Editor Military Embedded SystemsH-1 helicopters via BellAMARILLO, Texas. The base contract and three option years cover modifications to 28 AH-1Z aircraft and 21 UH-1Y aircraft at Bell’s Amarillo Assembly Center, the statement reads. The upgrades include a scalable aircraft architecture, an updated data bus, Link 16 connectivity, and support for network-enabled weapons. UH-1Y modifications will also cover fast-rope, hoist, and litter equipment used for personnel-recovery missions, according to the statement. Bell completed initial SPINE modifications on one AH-1Z and one UH-1Y in 2025.