Stepdown fix. The point after which additional descent is permitted within a segment of an IAP.
Strapdown system. An INS in which the accelerometers and gyros are permanently 'strapped down' or aligned with the three axes of the aircraft.
STEPDOWN FIX- A fix permitting additional descent within a segment of an instrument approach procedure by identifying a point at which a controlling obstacle has been safely overflown.
STEP TAXI- To taxi a float plane at full power or high RPM.
  
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