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HOLDING PATTERN COMPUTER (HPC-2) You are flying a heading of 055 when you are issued this clearance ""...hold east of the ABC VORTAC on the zero niner zero radial, left turns..."" This clearance is enough to invoke a rapid heart beat in the most experienced pilots. Although holding patterns may be used on any instrument flight, holding clearances are issued infrequently enough for pilots to get a little rusty on the procedures. Visualizing a holding pattern from a current position is one of the more challenging aspects of instrument flight. ASA's holding pattern computer shows pilots which entry is appropriate given the assigned holding radial.