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Figure  7-2-1.  Emergency Torque Available
Figure  7-3-1.  Maximum Torque Available (10 - Minute Operation)

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-10            7-3-1 SECTION  III.  MAXIMUM TORQUE AVAILABLE 7-3-1.  Maximum Torque Available (10  Minute Operation). Maximum torque available (10 minute operation) may be obtained from figure 7-3-1.  Available torque is presented in terms of pressure altitude and free air temperature. 7-3-2.  USE OF CHART. The primary use of the chart is to determine available engine torque for various combinations of pressure alti- tude and temperature.  To determine torque available, it is necessary to know pressure altitude and free air tem- perature.  Enter the left side of the chart at known temper- ature, move right to known pressure altitude, then down to read torque available. 7-3-3.  Conditions. The chart is based on a rotor speed of 100%. Reduce the derived torque available by 1.8% however not at transmission torque limit. 7-3-4.  Maximum Torque Available (30 Minute Operation). Maximum  Torque  Available  (30  Minute  Operation) may be obtained from figure 7-3-2.  Available torque is presented in terms of PA and FAT. 7-3-5.  Use of Chart. The primary use of the chart is to determine available engine torque for various combinations of pressure alti- tude and temperature.  To determine torque available, it is necessary to know pressure altitude and free air tem- perature.  Enter the left side of the chart at known temper- ature, move right to known pressure altitude, then down to read intermediate torque available. 7-3-6.  Conditions. The chart is based on a rotor speed of 100%. 7-3-7.  EAPS Installed. Reduce the derived torque available by 1.8% however not at transmission torque limit.







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