AMARILLO, Tex. -- Bell Textron Inc. has completed the first upgraded AH-1Z Viper and UH-1Y Venom under the Structural and Power Improvements for NextGen Effects (SPINE) program, a major U.S. Marine Corps initiative to enhance the H-1 fleet’s survivability and combat capability.
Formerly known as SIEPU, the renamed program highlights its focus on structural and power improvements to support next-generation mission systems. The upgraded aircraft have been delivered to Naval Air Station Patuxent River for flight testing, which will define the final configuration for future fleet-wide modifications. SPINE upgrades strengthen the airframe and expand electrical power capacity, enabling integration of advanced weapons, sensors, and digital systems.
This effort is central to the long-term modernization of the Marine Corps’ H-1 fleet, ensuring continued operational relevance in increasingly complex combat environments. The initial upgrades, completed after 19 months of work, mark a key milestone and pave the way for broader fleet enhancements over the coming decade.