1. VLO is the Maximum Landing Gear Operating speed. It is the maximum speed at which it is safe to extend or retract the landing gear on a retractable gear helicopter.
It is possible that the retraction and extension speeds may be different. In this case, the speed will be identified as VLO (RET) and VLO (EXT).
It is normally less than VLE, because the undercarriage doors are more vunerable to damage when in the operating regime, rather than when they are closed.
2. VLE is the Maximum Landing Gear Extended speed. It is the maximum speed at which it is safe to fly a retractable gear helicopter with the landing gear extended.
It is generally a higher speed than VLO, because once the gear is extended, the undercarriage doors close and the undercarriage legs can withstand higher aerodynamic loads.
NOTE:
The landing gear, in particular the undercarriage doors, are not designed to take the same aerodynamic loads as the main airframe. Speed limits are, therefore, imposed on the operation of the gear and flight with the landing gear extended.
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