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Next chapter for H-1 helicopters begins, says Bell

April 3, 2024  By Helicopters Staff

The Structural Improvement Electrical Power Upgrade modification program provides immediate benefits to the AH-1Z Viper and UH-1Y Venom, in addition to future weapon configurations. (Photo: Bell Textron)

The first Bell AH-1Z set to receive the Structural Improvement Electrical Power Upgrade (SIEPU) modification to be provided by Bell Textron, under a contract with the U.S. Marine Corps, has arrived at Bell’s Amarillo Assembly Center.

Bell explains SIEPU modifications optimize the aircraft to improve mission capabilities, aircrew safety and interoperability by increasing the electrical power capacity on the aircraft and support the integration of additional cabin capabilities. SIEPU marks the start of the next chapter in the life of domestic H-1 helicopters, continues Bell, following the completion of the U.S. Marine Corps Program of Record in November 2022.

“The Bell AH-1Z Viper and UH-1Y Venom provide the backbone of attack and utility aviation support in the various battlespaces in which they are used, so SIEPU comes at an important time for the future strategic implementation of this platform,” said Mike Deslatte, Bell H-1 senior vice president and program director. “SIEPU will be immediately beneficial for today’s operations, and also sets the H-1 up to quickly support future operational needs, some that may not even be conceived of yet.”

With SIEPU, Bell explains H-1s will be able to upgrade to current weapons systems with next generation capabilities, including kinetic long-range munitions and air launched effects, as well as new non-kinetic capabilities. Bell explains these upgrades greatly extend reach and range while simultaneously enhancing standoff distance.


Bell notes the H-1s have demonstrated their capability to counter enemy unmanned aerial systems; and SIEPU will also allow for there to be enough on-board power capacity for future weapons that are yet to be implemented.

“We are confident that SIEPU will help the Marine Corps expand mission essential tasks with more mission flexibility,” said Danielle Markham, SIEPU program manager. “The important thing is to make sure the H-1 is in a position to take advantage of those opportunities as they become available.”

Prior to arriving at the Bell Amarillo Assembly Center, the AH-1Z and UH-1Y completed datalink capabilities testing with the Marine Corps modifications at Camp Pendleton and testing with VMX-1 in Yuma. Bell plans to continue supporting the AH-1Z Viper and UH-1Y Venom through the 2040s in alignment with the Marine Corps Aviation Plan.


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