Figure 7A-7-1. Example Cruise Chart (Sheet 1 of 2)

EAPS Penalty Table (Continued) - TM-1-1520-240-10_477

Figure 7A-7-1. Example Cruise Chart (Sheet 2 of 2)

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-10 7A-7-6 CRUISE EXAMPLE EXAMPLE 1 (DUAL ENGINE) WANTED: SPEED FOR MAXIMUM ENDURANCE SPEED FOR MAXIMUM RANGE MAX. SPEED AT CONTINUOUS TORQUE RATING ESTIMATED AIRSPEED LIMIT WITH CRUISE GUIDE INDICATOR (CGI) OPERATIVE KNOWN: GROSS WEIGHT = 50,000 LB. PRESSURE ALTITUDE = SEA LEVEL FAT = 30_C METHOD: READ SPEEDS WHERE GROSS WEIGHT LINE INTERSECTS PERFORMANCE OR LIMIT LINE MAXIMUM ENDURANCE: TAS = 89 KN, IAS = 83 KN MAXIMUM RANGE: TAS = 144 KN, IAS = 140 KN MAX SPEED (CONTINUOUS TORQUE RATING): TAS = 152 KN, IAS = 149 KN AIRSPEED LIMITED BY VCGI. EXAMPLE 2 (DUAL ENGINE) (DASH LINE) WANTED: TORQUE REQUIRED FOR LEVEL FLIGHT, FUEL FLOW, AND INDICATED AIRSPEED AT TAS = 120 KN. KNOWN: GROSS WEIGHT = 45,000 LB. PRESSURE ALTITUDE = SEA LEVEL FAT = 35_C TRUE AIRSPEED = 120KN METHOD 1 (SIMPLEST) USE NEXT HIGHER TEMPERATURE (40_C) ENTER TAS, MOVE RIGHT TO GROSS WEIGHT MOVE DOWN READ TORQUE REQ’D = 55% (PER ENGINE) MOVE UP READ FUEL FLOW = 2,600 LB/HR (TOTAL) MOVE RIGHT READ IAS = 114 KN METHOD 2 (INTERPOLATE) READ TORQUE REQ’D, FUEL FLOW, AND IAS AT EACH ADJACENT TEMPERATURE THEN INTERPOLATE BETWEEN TEMPERATURES (REFER TO TABLE BELOW) PRESSURE ALTITUDE SEA LEVEL SEA LEVEL SEA LEVEL FAT 30_C 40_C 35_C TORQUE REQ’D (%) 54.7% 55% 54.9% FUEL FLOW (LB/H) 2,570 2,600 2,585 IAS (KNOTS) 117 114 115.5 Figure 7A-7-1. Example Cruise Chart (Sheet 1 of 2)

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