6-7. CHART C BASIC WEIGHT AND BALANCE
Chart C is a continuous history of the basic
weight and moment resulting from structural and
equipment changes made in service. At all times, the
last weight and moment/100 entry is considered the
current weight and balance status of the basic aircraft.
FORM F, DD FORM 365-4.
a. General. Form F is a summary of the actual
disposition of load in the aircraft. It records the
balance status of the aircraft step by step. It serves as
a worksheet on which the weight and balance
technician records the calculations and any corrections
that must be made to ensure the aircraft will be within
weight and CG limits. It is necessary to complete
Form F prior to flight whenever an aircraft is loaded in
a manner for which no previous valid Form F is
The form is used to derive the gross weight and
CG of any aircraft. The Form F furnishes a record of
the aircraft weight and balance status at each step of
loading process. It serves as a worksheet to record
weight and balance calculations and corrections that
must be made to ensure that the aircraft will be within
weight and CG limits. Instructions for filling out a Form
F are given in TM 55-1500-342-23.
Section III. FUEL/OIL
6-9. FUEL LOAD.
Fuel loading imposes a restriction on the amount
of load that can be carried. The required fuel must first
be determined, then that weight subtracted from the
total weight of passengers, baggage and fuel.
Weights up to and including the remaining allowable
capacity can be subtracted directly from the weight of
passengers, baggage and fuel. As the fuel load is
increased, 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 or
pounds of fuel at specific weights of 6.5 lb/gal (JP-4)
and 6.8 lb/gal (JP-5/8). Fuel moments should be
determined by entering the chart with fuel weight and
using the line on Figure 6-2 that represents the
specific weight closest to that of the fuel being used.
For a given weight of fuel there is only a very small
variation in fuel moment with change in fuel specific
weight. Additional correction for fuel specific weight is
The fuel tank usable fuel weight will vary
depending upon specific weight. The fuel quantity
indicator is calibrated for correct indication when using
JP-5 or JP-8. When using other fuels, multiply the
indicated fuel quantity in pounds by .99 for JP-4 or by
.98 for Aviation Gasoline (100/130).
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 15 °C change. Specific weight may also vary
between lots of the same fuel at the same temperature
by as much as 0.5 lb/gal. The following approximate
fuel specific weights at 15 °C may be used for most
b. Oil Data. Total oil weight is 62 pounds and
is included in the basic weight of the aircraft. Servicing
information is provided in Section XII of Chapter 2.