;M601A: :Initial production variant for early version of the Let L410. ;M601B: :Production variant for the Let L410UVP. ;M601D :Developed for the Let L410UVP. ;M601D-1: :Agricultural variant for high-cycle operation, used on the PZL Kruk and Ayres Thrush. ;M601D-2: :Special variant for paradrop aircraft, used on the Do 28 and some Finist conversions. ;M601D-11: :Agricultural and paradrop variant with a higher Time Between Overhaul of up to 1800 hours. ;M601D-11NZ: :Downrated variant for use in the FU-24 Fletcher. ;M601E: :Developed for the Let L410UVP-E. ;M601E-11: :General use engine with sub-variants of differing TBO. ;M601E-11A: :Variant of the 11 for use at higher operating altitudes and modified with a low pressure bleed air system for pressurised aircraft. ;M601E-21: :Variant for the L410-UVP-E used for hot and high operations. ;M601F: :Variant intended for use on the L420. ;M601FS: ;M601F-11: ;M601F-22: ;M601F-32: ;M601FS: ;M601T: :Aerobatic variant for use on the PZL Orlik. ;M601H-80: now the
GE Aerospace Czech H80 ;M601Z: :Agricultural variant for use on the Z-37T. ==Applications==