MIL-STD-1811 (USAF)
12 AUG 91
SECTION 3
DEFINITIONS
MASS PROPERTIES.
3.1
The mass properties of an item include the item's weight (or
mass), center of gravity (or center of mass), mass moments of
inertia, and mass products of inertia.
CURRENT MASS PROPERTIES.
3.2
The current mass properties of an item are the mass
properties data based on an assessment of the most recent
baseline design. This design assessment includes the estimated,
calculated, or measured mass properties, and also includes an
estimate for undefined design details. The weight growth
allowance and uncertainties are not included.
3.3 WEIGHT GROWTH ALLOWANCE.
The weight growth allowance is the predicted change to the
mass properties of an item based on an assessment of the design
and fabrication status of the item, and an estimate of the
design changes that may still occur. The design changes that
may occur can be both in-scope and out-of-scope.
3.3.1 Inscope Changes.
In-scope design changes are
changes that may be implemented by the contractor to meet design
requirements. The weight growth allowance associated with
in-scope design changes provides for the lack of design maturity.
3.3.2 Out-of-scope Changes.
Out-of-scope design changes
are changes that are out-of-scope with respect to the current
contract baseline, but for any number of reasons may be
considered in the future. The weight growth allowance
associated with undefinitized out-of-scope design changes are
based entirely on past program experience and are very difficult
to predict. At the direction of the customer, the weight growth
allowance for undefinitized out-of-scope design changes may be
omitted. Definitized proposed changes are out-of-scope until
the changes are authorized by an official contract change. The
weight growth associated with a definitized proposed change is
based on the proposed change.
PREDICTED MASS PROPERTIES.
3.4
The predicted mass properties of an item are the current
mass properties plus the weight growth allowance.
3
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