TM 1-1520-240-107A-11-1SECTION XI. AIRSPEED CALIBRATION7A-11-1. Description.The airspeed calibration chart, figure 7A-11-1, definesthe relationship between indicated (IAS), and calibratedairspeed (CAS) for level flight, climb and autorotation.7A-11-2. Use of Chart.The primary use of the chart is illustrated by the example.To determine calibrated airspeed, it is necessary to knowIAS and flight regime. Enter chart at indicated airspeed,move right to appropriate flight regime, move down andread calibrated airspeed.7A-11-3. Conditions.Presented airspeed calibration charts are for CH-47Dhelicopters with T55-GA-714A engines.
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