AZ1 STUDY INFO

The c.g. of a loaded aircraft can be calculated when
the weights and arms of the items which make up the
aircraft gross weight are known. This can be done by
using moments. The relationship between weight,
arm, and moment is as follows:

WEIGHT×ARM = MOMENT

First, record the aircraft's basic weight and
moment from the Chart C. The Chart C basic
moment is a simplified moment and must be
multiplied by the given constant.

Determine the moments of the load items,
either by multiplying the individual weights by their
arms, or by recording them out of the

Fuselage Station (FS) is often equal at each point to
the balance arm scale. However, if the aircraft
fuselage is shortened or lengthened, the original
fuselage sections usually retain their old FS
designations. Such changes most often occur in the
design or production phase, before the aircraft
becomes operational

(MEAN
AERODYNAMIC CHORD).
The location of the aircraft c.g. is commonly
expressed not by its balance arm, but by percent
MAC. Percent MAC identifies a location with
respect to the position of the MAC; 0.0 percent at the
leading edge of the MAC and 100.0 percent at the
trailing edge.

Sometimes design, manufacturing, or maintenance
changes cause the aircraft c.g. to exceed its limits.
This is usually corrected by the addition of
permanent ballast that always remains in the aircraft.
When the ballast is added to counter the temporary
removal of an item or to balance a particular
configuration, it is called temporary ballast

Naval Air Systems Command shall maintain overall
responsibility for establishing the requirements,
procedures, and forms format for USN/USMC
aircraft weight and balance control.
NAVAIRSYSCOM (AIR-4.1.5) is the office of
primary responsibility for the following duties:Approval review for technical content and
format of Charts A & E for individual aircraft
models.
4-2.3. Act as the USN/USMC Technical POC for
the Automated Weight and Balance System (AWBS)
software.
4-2.4. Determination and specification of
USN/USMC aircraft weight and balance
classifications.
4-2.5. Providing specialized weight and balance
engineering support to test, maintenance and
operating commands.
4

The Type Commanders shall ensure that reporting
custodians establish an effective system for weight
and balance control of aircraft assigned to their
command.

The Reporting Custodians shall establish effective
operating procedures for weight and balance control
of aircraft assigned to their command.
4-7.1. The reporting custodian shall designate the
qualified Weight and Balance Officer, and any
additional qualified Weight and Balance Personnel,
in accordance OPNAVINST 4790.2 Volume I.
4-7.2. The Reporting Custodians shall ensure that
weight and balance control system requirements and
procedures of this manual, and related technical
documentation, are complied with in accordance with
the management procedures of OPNAVINST 4790.2
and OPNAVINST 3710.7. The weight and balance
control system requirements and procedures shall
include, but not necessarily be limited to ensuring:
4-7.2.1. Weight and balance handbooks for all
assigned aircraft, including newly received aircraft,
are complete, current, and maintained in the correct
format.
4-7.2.2. Procedures are in place to ensure weight
and balance flight clearance is accomplished per
OPNAVINST 3710.7, the aircraft specific Chart E,
and this manual

Commercial activities involved in the weight and
balance control of USN/USMC aircraft shall comply
with requirements of paragraphs 4-5 and 4-7 as
applicable

CLASS 1. Class 1 aircraft are those whose
recommended weight and c.g. limits sometimes can
be exceeded by loading arrangements normally
employed in operations and therefore need loading
control. CLASS 2. Class 2 aircraft are those whose
recommended weight and c.g. limits can more readily
be exceeded by loading arrangements normally
employed in operations and, therefore need a higher
degree of loading control.

CLASF-4, F-5, F-14, F-16, F/A-18S 1 A-4, A-6, AV-8, S-3
CLASS 2 C-2, C-9, C-12, C-20,
C-40, C-130 EP-3, E-6 P-3

An aircraft weight and balance handbook provides
for the continuous record of the weight and balance
of a particular aircraft

The weight
and balance handbook shall be maintained for each
assigned active aircraft by qualified weight and
balance personnel. The handbook charts, forms and
records shall be maintained in accordance with
requirements and instructions of this manual

Record of Weight and
Balance Personnel.

Basic
Weight Checklist Record.

Aircraft Weighing
Record

Basic
Weight and Balance Record

Loading Data for
applicable aircraft.

Weight and Balance Clearance Form.

conditions exist:
4-14.1. As required by pertinent service directives.
4-14.2. When weighing requirements are specified
in the applicable aircraft Chart E.
4-14.3. After completion of (including painting)
each rework (e.g. overhaul, SDLM, etc).
4-14.4. When major modifications or repairs are
made. When TD’s, modifications, or repairs are
accomplished and calculated or actual weight and
moment data are not available.When an aircraft is in a NADEP or
other authorized weighing facility for any reason, and
has not been weighed in five (5) years, (i.e., the most
recent “as-weighed” Basic Weight entry in the Chart
C is more than five (5) years ago).

Electronic computer printout sheets
when the data recorded is identical to that required on
the DD Form 365-4.
4-13.7.2. The designated commercial type
loading schedule for C-9 and C-40 aircraft.
4-13.7.3. Computer programs that only produce
the DD 365-4 forms must follow the requirements in
SECTION 9 of this Technical Manual