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SECTION  II.  WEIGHT AND BALANCE
Figure  6-3-1.  Fuel Moment Chart

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-10            6-3-1 SECTION  III.  FUEL/OIL 6-3-1.  Fuel and Oil Data. The CH 47D is equipped with six fuel tanks and an inte- gral oil tank on each engine. The capacities of each fuel tank and each oil tank are given in Chapter 2. 6-3-2.  Fuel Weight and Moment. Fuel  moments  for  the  forward  auxiliary,  main  and  aft auxiliary fuel tanks are shown in figure 6-3-1. The fuel arms for these tanks are constant thus, for a given weight of fuel there is no variation in fuel moment with change in fuel specific weight. The common auxiliary fuel tank arm is 314. The full tank usable fuel weight will vary depending upon fuel specific weight. The gallon scales on figure 6-3-1 are based on JP-4 @ 6.5 lb/gal, JP-5 @ 6.8lb/gal, and JP-8 @ 6.7 lb/gal. The aircraft fuel gage system was designed for use with JP-4, but does tend to compensate for other fuels and provide acceptable readings. When possible the weight of fuel onboard should be determined by direct reference to the aircraft fuel gages. The following information is provided to show the general range of fuel specific weights to be expected. Specific weight of fuel will vary depending on fuel temperature. Specific weight will decrease as fuel temperature rises and increase as fuel temperature decreases at the rate of approximately 0.1 lb/gal for each 15ºC change. Specif- ic weight may also vary between lots of the same type fuel at the same temperature by as much as 0.5 lb/gal. The following approximate fuel specific weights at 15ºC may be used for most mission planning. Fuel Type Specific Weight JP-4 6.5 lb/gal JP-5 6.8 lb/gal JP-8 6.7 lb/gal 6-3-3.  Oil Data For weight and balance purposes, the weight of engine oil is included in the basic weight.







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