Loadings. (1) Power loading. The loaded weight of an aeroplane divided by the total power of the engine(s). (2) Span loading. The loaded weight of an aeroplane or glider divided by the square of the wing span. (3) Surface loading.
Their purpose is to change the amount of control force required to deflect the control column under different g-loadings.
In the case of high-performance aircraft, including fighters, this "1-g" line showing straight-and-level flight is often overlapped with additional lines showing the maximum performance at various gee loadings.
If all his current experience is in C-152s and he's getting ready to launch in a Glasair III, he'll see why no amount of C-152 time will prepare him for the high speeds and even higher wing loadings.
Generally, aircraft with higher disk loadings require a higher flare. If the pilot flares too high, the helicopter will stop it's descent too high above the ground to make a safe landing.
 See also: Landing, Aircraft, Weight, Speed, Plane
  
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