369: Military prototype designated YOH-6A, 369A: Military production designated OH-6 MD 500C (369H): Improved five-seat commercial variant powered by an Allison 250-C18B; certified in 1966 Kawasaki-Hughes 369HS: Built under license by Kawasaki Heavy Industries in Japan alongside OH-6J MD 500M Defender (369HM): Military export version as the MD 500 Defender; certified in 1968 MD 500C (369HS): Improved four-seat commercial variant by an Allison 250-C20; certified in 1969 MD 500C (369HE): A 369HS with higher standard interior fittings, certified in 1969 MD 500D (369D): New commercial version from 1976 powered by an Allison 250-C20B; certified in 1976 MD 500E (369E): Executive version of the 500D with recontoured nose; certified in 1982 NH-500E: Italian-built version of the 500E. License-produced by Breda Nardi before merging with Agusta MD 520N: NOTAR (NO TAil Rotor) version of the 500E, certified in 1991. Powered by Rolls-Royce MD 530F (369F): Hot and high version of the 500E powered by a Rolls-Royce 250-C30HU; certified in 1984
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