Bell to Upgrade 49 Marine Corps AH-1Z and UH-1Y Helicopters in $300M Contract

Bell has been awarded a contract valued at an estimated $300 million by the US Navy to upgrade a fleet of 49 Marine Corps rotary-wing aircraft. The contract targets 28 AH-1Z Viper attack helicopters and 21 UH-1Y Venom utility helicopters as part of an initiative known as the Structural and Power Improvements for NextGen Effects, or SPINE. Scheduled to commence in mid-2027, the modification work will take place at Bell’s Amarillo Assembly Center in Texas. Bell anticipates that the first of these upgraded aircraft will be delivered in 2028, marking a significant modernization milestone for the longstanding H-1 fleet.

The SPINE program aims to significantly enhance the electrical power capacity of both the AH-1Z and UH-1Y helicopters, incorporating a new digital architecture that can support next-generation sensors, weapons, and defensive systems. This upgrade integrates advanced databus technology including Link 16, allowing these helicopters to seamlessly share targeting and battlefield data with other US and allied forces. This connectivity transforms H-1 crews into more effective participants in networked combat operations and aligns the fleet with modern joint force interoperability standards.

Additionally, the UH-1Y Venom will receive mission-critical improvements to its fast-rope, hoist, and litter equipment, improvements that are particularly important for personnel recovery operations conducted in austere or remote environments. The Marine Corps refers to the aircraft fitted with these upgrades as Series A models, which will feature not just enhanced power but also improved defensive systems and connectivity enhancements. These upgrades ensure the continued relevance and operational flexibility of the Viper and Venom helicopters well into the 2040s.

Bell completed initial SPINE modifications on prototype AH-1Z and UH-1Y aircraft in late 2025. Following these upgrades, the aircraft were delivered to Naval Air Station Patuxent River, Maryland, where they underwent flight testing. The current effort, designated as Phase 3.0, marks a transition from initial test modifications to full fleet-wide retrofit activities, signaling a major step in extending the H-1 platform’s service life and capability.

The AH-1Z and UH-1Y helicopters share approximately 85 percent of their components, including engines, rotor systems, transmissions, and avionics. This component commonality allows Marine Corps units to operate both attack and utility helicopters in a more integrated manner, simplifying maintenance logistics and reducing operational costs. Bell completed deliveries of the 189-aircraft AH-1Z program of record in 2022, and had previously finished delivering the 160 UH-1Y helicopters by 2018.

According to Bell Program Manager Danielle Markham, the SPINE upgrades provide the necessary electrical capacity and digital platform adaptations to keep the H-1 fleet aligned with evolving battlefield technology requirements. The modernization effort reflects the US Navy and Marine Corps’ strategy to maintain combat relevancy through modular upgrades rather than wholly replacing the airframes. This approach allows for more rapid incorporation of emerging technologies in response to dynamic threat environments.

US Marine Corps officials, represented by Col. Jason Duke from the Navy’s H-1 program office, emphasize that the SPINE program significantly boosts electrical capability necessary to host advanced battlefield technologies. The upgrades are critical for ensuring that the AH-1Z and UH-1Y fleets remain mission-effective through the middle of the century. This contract’s options could extend work over the next three years, subject to Navy requirements and funding.

Bell’s contract structure includes multiple payment arrangements tailored to different aspects of the work involved. The total contract value is described as an estimate, indicating that the US Navy has not fully obligated all funds upfront. Nonetheless, the investment reflects a strategic commitment to sustaining the Marine Corps’ rotary-wing attack and utility helicopter capabilities over the long term.

The SPINE program’s emphasis on augmenting power generation, digital connectivity, and adaptable architecture positions these upgraded helicopters as key assets within the US Marine Corps’ aviation modernization plans. As the H-1 fleet continues to operate alongside newer platforms, these enhancements ensure that the Viper and Venom remain capable contributors to multi-domain operations and joint force integration through ongoing technological evolution.