TM 1-1510-224-10
Section III. FUEUOIL
6-9. FUEL LOAD.
Fuel loading imposes a restriction on the amount of load
which can be carried. The required fuel must first be
determined, then that weight subtracted from the total
weight of crew and fuel. Weight up to and including the
remaining allowable capacity can be subtracted directly
from the weight of crew and fuel. As the fuel load is
increased, the loading capacity is reduced. Figure 6-2
depicts the density variation of aviation fuel.
6-10. FUEL AND OIL DATA.
a.
Usable Fuel Moment Tables. Fuel Moment
Tables 6-3 and 6-4 show usable fuel moments/100 for
US gallons (or pounds) for fuel specific weights ranging
from 6.4 to 7.1 pounds per gallon. Fuel moments should
be determined by entering the table by fuel weight and
using the column which represents the specific weight of
the fuel being used.
The full tank usable fuel weight will vary
depending upon fuel specific weight. The fuel quantity is
calibrated for correct indication using JP-5 or JP-8.
When using other fuels multiply the indicated fuel in
pounds by 0.99 for JP-4 or by 0.98 for aviation gasoline.
Figure 6-2 is provided to show the general range
of specific weights to be expected with the change in fuel
temperature. Specific weight will vary between different
lots of the same type of fuel at the same temperature by
as much as 0.5 pounds per gallon. The following
approximate fuel specific weights at 15 degrees Celsius
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
b.
Oil Data. Total oil weight is 52 pounds and is
included in the basic weight of the aircraft.
Table 6-5. Center of Gravity Limits (Landing Gear Down) Restricted Category
WEIGHT CONDITION
FORWARD CG LIMIT
AFT CG LIMIT
16,500 LBS (MAXIMUM TAKE-OFF)
15,675 LBS (MAXIMUM LANDING)
13,100 LBS (MAXIMUM ZERO FUEL)
12,600 LBS OR LESS
188.7
186.7
180.3
179.0
195.1
195.1
195.1
195.1
NOTE:
The moment/I00 for retraction of the landing gear is -61.6. Loadings based on wheels-down condition which fall within the
limiting moments in the table, will be satisfactory for flight with landing gear retracted.
BT05792
6-7
