USArmy-ApacheLongbow

TM 1-1520-251-10
6.2.4 Loading Data. The loading data in this chapter is
intended to provide information necessary to work loading
problems for the helicopter. From this data, weight and
moment/100 are obtained for all variable load items and
are added to the current basic weight and moment/100
from Chart C (DD Form 365-3) to determine the gross
weight moment/100 using Form F (DD Form 365-4). The
effect on helicopter CG of expending the fuel and armament
in logical sequence may be checked by subtracting
the weight and moment/100 of each item from the takeoff
gross weight and moment/100; then, checking the new
moment (or helicopter CG) with the CG limits chart. This
check should be made to determine if the CG will remain
within limits during the entire flight. Refer to paragraph
6.2.1 for helicopter CG management.
6.2.5 Weight and Balance Clearance Form F, DD Form
365-4. Form F is the summary of the actual disposition
of the 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.
6.2.6 CG Management. This paragraph contains fuel
management methods that can be used to maintain CG
limits in flight and during the expending of external stores
for some helicopter configurations. Table 6-1 lists CG shift
as stores are expended. When the storage bays are used
for miscellaneous equipment, it is possible to cause an aft
CG condition.
a. 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
(1012 pounds of JP-4) and reduce fuel load in the aft tank
depending on CG shift required. For some missions, it
may be necessary to reduce the stowed weight.
b. Table of Expendables. The table of expendables
(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 eliminates 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.
c. 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.
Use or disclosure of this information is subject to the restriction(s) on the title page of this document.
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