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check should be made to determine if the cg will remain
within limits during the entire flight. Refer to paragraph
6.10 for helicopter cg management.
6.8 CHART C - BASIC WEIGHT AND BALANCE
RECORD, DD FORM 365-3.
Chart C is a continuous history of the basic weight and
moment resulting from structural and equipment
changes in service. At all times, the last weight and moment/
100 entries are considered the current weight and
balance status of the basic helicopter.
6-3
TM 1-1520-238-10
6.9 WEIGHT AND BALANCE CLEARANCE FORM F,
DD FORM 3654.
Form F is the summary of the actual disposition of load
in the helicopter. It records the balance status of the helicopter
step-by-step. It serves as a work sheet on which
to record weight and balance calculations and any
corrections that must be made to ensure that the helicopter
will be within weight and cg limits throughout
the mission. There are two versions of this form: Transport
and Tactical. Each was designed to provide for the
respective loading arrangement of these two types of
aircraft. The general use and fulfillment of either version
is the same.
6.10 CENTER OF GRAVITY MANAGEMENT.
This paragraph contains fuel loading/management
methods that can be used to maintain cg limits in flight
and during the expending of external stores for some
helicopter configurations. The table of expendable
(table 6-1) provides a guide for quick definition of intermediate
flight cg as stores/fuel are expended at various
gross weights and at forward and aft cg limits. Table
6-1 eliminate calculation of intermediate cg when the
helicopter is well within limits. When flight limits are
doubtful or when operation is close to cg limits, a detailed
calculation must be made to determine any cg
limit violation. When the storage bays are used for miscellaneous
equipment it is possible to cause an aft cg
condition.
6.10.1 Fuel Loading. The helicopter takeoff cg can be
moved by loading either tank with more fuel than the
other. Example: to move the cg forward, fill the forward
tank (1014 pounds of JP-4) and reduce fuel load in the
aft tank depending on cg shift required. For some missions,
it maybe necessary to reduce the stowed weight.
6.10.2 Fuel Management. The following example
presents normal cg/fuel management where each fuel
tank supplies an engine. This procedure prevents drastic
helicopter cg shifts as fuel is expended. Refer to
Chapter 2 for fuel system details.
EXAMPLE:
1. Using table 6-1, refer to FUEL EXPENDED
500 lb EACH line. Note that fuel expended at
15,000 gross weight at forward cg limit produces
a helicopter forward cg shift of -0.13
inch; and at aft cg limits, +0.29 inch. When
the helicopter cg is at the combined fuel cg
(202.8 inches) expending fuel will produce a
zero shift. This is true only when the forward
tank fuel remains in the lower portion of the
L-shape tank. Refer to paragraph 6.12.
2. When filling the forward tank into the upper
portion of the L-shape, the combined fuel expended
cg moves aft to 212.4 inches which
means that the helicopter cg will always shift
forward during fuel burnoff in this area.
3. Refer to the 1000 lb fuel expended each tank
line in table 6-1. Note that fuel expended at
15,000 gross weight at aft cg limit is +0.41 inches.
This is correct when the total 2,000
pounds of fuel is expended, but this includes a
helicopter cg shift forward during initial fuel
burn-off due to the forward L-shaped tank.
4. For the full fuel example based on a conservative
gross weight of 15,000 pounds and cg of
201.0 inches, 208 pounds of aft fuel must be
transferred so that all fuel can be expended
equally. A helicopter cg shift of- 1.49 to -1.68
inches is produced depending on when the
transfer occurs. When working with full fuel,
it is advisable to calculate several intermediate
points and determine when it’s best to
transfer fuel.
6-4
TM 1-1520-238-10
Table 6-1. Helicopter CG Movement When Loaded Items Are Expended
Aircraft Gross
Expended Items
Ammo
Ammo
Ammo
H-F Missiles
H-F Missiles
600 +0.19 +0.16 +0.14
1200 -0.08 -0.08 -.0.06
8 +0.66 +0.57 +0.48
16 +1.14 +1.21 +1.01
38 +1.00 +0.86 +0.72
76 +2.18 +1.85 +1.52
Rockets 27.1 lbs ea.
Rockets 27.1 lbs ea.
Chaff
Weight
Qty
200
When Aircraft CG Near
Fwd CG Limit
13000 15000 17650
+0.32 +0.27 +0.23
30 -0.23 -0.20 -0.17
When Aircraft CG Near
Aft CG Limit
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