Engine Overview
The U.S. Navy 'marinized' the T700 after completing rigorous salt ingestion tests, proving its suitability for shipboard operation. The first engine to complete testing was given the model designation of -401, and later upgraded with more power to become the -401C, and primarily powers the H-60 series of naval helicopters as well as and search and rescue helicopters.
The U.S. Marine Corps is re-engining its fleet of UH-1N helicopters with T700-401C turboshaft engines as part of its program to upgrade them to the "4BN" or UH-1Y configuration, which will be equipped with a four-blade rotor, an improved tail rotor and an increased-rating transmission. USMC AH-1W helicopters, similarly upgraded to the "4BW" or AH-1Z configuration, are currently undergoing flight testing, powered by T700-401 engines, with upgrades to the engine expected soon.
