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6-2. Use the scale for the specific weight closest to that
of the fuel being used.
FUEL TYPE SPECIFIC WEIGHT
The full tank usable fuel weight will vary depending JP-4 6.5 lb/gal
upon fuel specific weight. The aircraft fuel gage system
was designed for use with JP-4, but does tend to JP-5 6.8 lb/gal
compensate for other fuels and provide acceptable JP-8 6.7 lb/gal
readings. When possible, the weight of fuel onboard JET-A 6.8 lb/gal
should be determined by direct reference to the aircraft
fuel gage. JET-A1 6.7 lb/gal
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 of fuel will decrease as 6-7. OIL QUANTITY DATA.
fuel temperature rises and increase as fuel temperature
decreases at the rate of approximately 0.1 lb/gal for For weight and balance purposes, engine oil is
each 15 °C change. Specific weight may also vary considered part of basic helicopter weight.
SECTION IV. PERSONNEL
6-8. PERSONNEL MOMENT. b. When helicopter is to be operated near weight or
center-of-gravity limits, the exact weight of each
a. Personnel loading of the helicopter consists of individual crewmember and items stored in the crew
the pilot and copilot/gunner (CPG). Refer to Crew station should be used. If weighing facilities are not
Longitudinal Moment Chart (fig. 6-3) to compute pilot available, or the tactical situation dictates otherwise, or
and CPG longitudinal moments and Crew Lateral if the loading condition is known not to be near the
Moment Chart (fig. 6-4) to compute pilot and CPG limits, compute personnel loading according to each
lateral moments. individual estimate.
SECTION V. CENTER OF GRAVITY
6-9. CENTER OF GRAVITY. flying weight (3350 lbs) to maximum gross weight (5500
lbs) and from most forward cg station 106.5 to most aft
a. General. This section contains the longitudinal cg station 113.0 are depicted. Longitudinal moments
and lateral helicopter center-of-gravity (cg) charts. The (total moment/100) are shown on the chart as diagonal
cg charts are used in combination with the loading lines. The chart is used to determine that gross weight
charts (figures 6-2 through 6-6), the mass properties and cg are within limitations using the pre-computations
tables (tables 6-1 through 6-4) DD Form 365-3 (Chart on DD Form 365-4, (Form F - Weight and Balance
C-Basic Weight and Balance Record), and DD Form Clearance). An example of how to apply the weights
365-4 (Weight and Balance Clearance Form F) to aid and moments from Form F to determine helicopter cg is
the pilot in computing the gross weight and cg of the shown on the chart. For loading of weapons system,
helicopter. mission equipment, and cargo refer to tables 6-1 and 6-
3.
b. Longitudinal Center-of-Gravity Chart. The
longitudinal center-of-gravity chart (fig. 6-5) is a c. Lateral Center-of-Gravity Chart. The lateral
graphics-type table with gross weight as a vertical center-of-gravity limits charts (fig. 6-6) are graphicsscale
and the moment arm fuselage station as the style tables with gross weight as the vertical scale and
horizontal scale. All allowable points from minimum moment arm (lateral cg - bl) as the horizontal scale.
6-3
TM 1-1520-248-10
Within the flight limits these are regions of restricted armament (including jettison of one side), fuel and crew
flight and takeoff/landing capabilities. For loading of loading as long as the maximum crew weight
weapons system, mission equipment, and cargo see differential is 65.0 lbs.
tables 6-2 and 6-4.
(1) All useful load conditions will remain within
the flight limits of ± 4.0 inches with all combinations of
6-4
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Figure 6-2. Fuel Moment Chart
6-5
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Figure 6-3. Crew Longitudinal Moment Chart
6-6
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406961-1387-2
H5260
Figure 6-4. Crew Lateral Moment Chart (Sheet 1 of 2)
6-7
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Figure 6-4. Crew Lateral Moment Chart (Sheet 2 of 2)
6-8
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Figure 6-5. Longitudinal Center-of-Gravity Limits Chart
6-9
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Figure 6-6. Lateral Center-of-Gravity Limits Chart (Sheet 1 of 2)
6-10
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Figure 6-6. Lateral Center-of-Gravity Limits Chart (Sheet 2 of 2)
6-11
TM 1-1520-248-10
OH-58D  MASS PROPERTIES
ARMAMENT USEFUL LOAD ITEMS
TABLE 6-1. WEAPON SYSTEMS LONGITUDINAL LOADING
WT LONGITUDINAL CG MOMENT/100
WPNS SYS/USEFUL LOAD ITEM (LB) (IN) (IN-LB)
.50 CALIBER MACHINE GUN (LEFT ONLY)
MACHINE GUN 142.8 102.1 146
AMMO CAN 20.4 120.3 25
　
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