TM 1-1520-240-107-11-1SECTION XI. AIRSPEED CALIBRATION7-11-1. Description.The airspeed calibration chart, figure 7-11-1, defines therelationship between indicated (IAS) and calibrated air-speed (CAS) for level flight, climb, and autorotation.7-11-2. Use of Chart.The primary use of the chart is illustrated by example. Todetermine 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.7-11-3. Conditions.Presented airspeed calibration charts are for CH-47Dhelicopters with T55-L-712 engines.
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