Beechcraft C-12C Operator And Technical Reference Manual

Contents

Beechcraft C-12C Operator And Technical Reference Manual Manual pdf 598 page image

TM 1-1520-218-106-7. CHART C – BASIC WEIGHT AND BALANCERECORD.Chart C is a continuous history of the basicweight and moment resulting from structural andequipment changes made in service. At all times, thelast weight and moment/100 entry is considered thecurrent weight and balance status of the basic aircraft.6-8. WEIGHT AND BALANCE CLEARANCEFORM F, DD FORM 365-4.a. General. Form F is a summary of the actualdisposition of load in the aircraft. It records thebalance status of the aircraft step by step. It serves asa worksheet on which the weight and balancetechnician records the calculations and any correctionsthat must be made to ensure the aircraft will be withinweight and CG limits. It is necessary to completeForm F prior to flight whenever an aircraft is loaded ina manner for which no previous valid Form F isavailable.The form is used to derive the gross weight andCG of any aircraft. The Form F furnishes a record ofthe aircraft weight and balance status at each step ofloading process. It serves as a worksheet to recordweight and balance calculations and corrections thatmust be made to ensure that the aircraft will be withinweight and CG limits. Instructions for filling out a FormF are given in TM 55-1500-342-23.Section III. FUEL/OIL6-9. FUEL LOAD.Fuel loading imposes a restriction on the amountof load that can be carried. The required fuel must firstbe determined, then that weight subtracted from thetotal weight of passengers, baggage and fuel.Weights up to and including the remaining allowablecapacity can be subtracted directly from the weight ofpassengers, baggage and fuel. As the fuel load isincreased, the loading capacity is reduced.6-10. FUEL AND OIL DATA.a. Fuel Moment Chart. This chart, Figure 6-2,shows usable fuel moment/1000 for US gallons orpounds of fuel at specific weights of 6.5 lb/gal (JP-4)and 6.8 lb/gal (JP-5/8). Fuel moments should bedetermined by entering the chart with fuel weight andusing the line on Figure 6-2 that represents thespecific weight closest to that of the fuel being used.For a given weight of fuel there is only a very smallvariation in fuel moment with change in fuel specificweight. Additional correction for fuel specific weight isnot required.The fuel tank usable fuel weight will varydepending upon specific weight. The fuel quantityindicator is calibrated for correct indication when usingJP-5 or JP-8. When using other fuels, multiply theindicated fuel quantity in pounds by .99 for JP-4 or by.98 for Aviation Gasoline (100/130).The following information is provided to show thegeneral range of fuel specific weights to be expected.Specific weight of fuel will vary depending on fueltemperature. Specific weight will decrease as fueltemperature rises and increase as fuel temperaturedecreases at the rate of approximately 0.1 lb/gal foreach 15 °C change. Specific weight may also varybetween lots of the same fuel at the same temperatureby as much as 0.5 lb/gal. The following approximatefuel specific weights at 15 °C may be used for mostmission planning.FUEL TYPE SPECIFIC WEIGHTJP-4 6.5 LB/GALJP-5 6.8 LB/GALJP-8 6.8 LB/GALb. Oil Data. Total oil weight is 62 pounds andis included in the basic weight of the aircraft. Servicinginformation is provided in Section XII of Chapter 2.6-4