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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. Specific
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.
TM 1-1520-240-10
6-3-2
Figure 6-3-1. Fuel Moment Chart
TM 1-1520-240-10
6-4-1
SECTION IV. PERSONNEL
6-4-1. Personnel Loading and Unloading.
The loading procedures should be accomplished and
observed before loading to ensure the safety and comfort
of personnel to be airlifted:
a. Passenger compartment – Clean.
b. Equipment – Stow and secure.
c. Troop seats – Install,as required.
d. Litters – Install, as required.
e. Static line anchor cable – Install, as required.
f. Safety belts – Check, attached.
g. Emergency equipment – Check.
h. Emergency exits – Inspect.
i. Special equipment – Check.
6-4-2. Personnel Weight Computation.
When the helicopter is to be operated at critical gross
weights, the exact weight of each individual occupant
plus equipment should be used. If weighing facilities are
not available, or if the tactical situation dictates otherwise,
loads shall be computed as follows:
a. Combat equipped soldiers – 240 pounds per individual.
b. Combat equipped paratroopers – 260 pounds
per individual.
c. Litter patient (including litter, splints, etc.) – 200
pounds per individual.
d. Medical attendants – 200 pounds per individual.
e. Crew and passengers with no equipment – Compute
weight according to each individual’s estimate.
f. Refer to figure 6-4-1 or 6-4-2 for personnel or litter
patient moment data. The chart (fig. 6-4-1) provides precomputed
moments for each troop seat position.
6-4-3. Seating Arrangement.
Seating arrangement for 33 fully equipped ground troops
is provided by ten 3-man seats and three 1-man seats
(fig. 6-4-3). A row of five 3-man seats is installed along
each side of the cargo compartment. One-man seats are
installed at the forward and aft ends of the left-hand row
of seats and one at the end of the right-hand row of seats.
6-4-4. Troop Seats.
These seats are made of nylon on tubular aluminum
frames and are joined together for greater rigidity and
comfort. The seats are joined by means of slide bolt
fasteners in the front seat tubes, zipper fasteners on the
underside of the seat fabric, and snap fasteners along
the vertical edges of the seat-back rests. A slide adjuster
below the back rest hanger clips affords adjustment of
back rest tension. Seat tension is adjusted by relocating
retaining pins in the holes drilled in the front seat tubes.
A row of male snap fastener studs along the rear of the
seat-back rest matches a row of female snap fastener
sockets along the rear edge of the seat fabric. These
fasteners are jointed to provide greater seat depth for
troops equipped with parachutes. Two stowage straps
are attached to the underside of the seat fabric; one is
equipped with a hanger clip for folded stowage, the other
is equipped with a buckle for rolled stowage. The seats
will normally be stowed in the folded position for cargo
transport.
A 2,000-pound-capacity nylon web safety belt is provided
for each seat occupant. The belt is adjustable and
is equipped with a positive-grip buckle fastener designed
for quick release.
6-4-5. Troop Seat Installation.
Install the troop seats from the rolled position as shown
in figure 6-4-4. Install troop seats from the folded position
by performing steps 1, 4, 6, and 7 of figure 6-4-4.
6-4-6. Troop Seat Stowage.
Stow the troop seats in the rolled position by performing
steps 1 through 9 in reverse order as set forth in figure
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