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These charts are intended for use by pilots operating from airfields within or near Class B and Class C airspace. Coverage of Terminal Area Charts are indicated by shaded boxes on the Sectional Chart index. These charts are updated every six months, Puerto Rico-Virgin Islands annually.Charted VFR Flyway Planning Charts are printed on the backs of selected Terminal Area Charts. Separate indices show the coverage of VFR Charts (Conterminous U.S. and Alaska).hese charts are updated every six months, Puerto Rico-Virgin Islands annually. Charted VFR Flyway Planning Charts are printed on the backs of selected Terminal Area Charts. Separate indices show the coverage of VFR Charts (Conterminous U.S. and Alaska).
Also called: statistical process control. The control chart is a graph used to study how a process changes over time. Data are plotted in time order. A control chart always has a central line for the average, an upper line for the upper control limit and a lower line for the lower control limit.These lines are determined from historical data.y comparing current data to these lines, you can draw conclusions about whether the process variation is consistent (in control) or is unpredictable (out of control, affected by special causes of variation). Control charts for variable data are used in pairs.