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Derivation of Contractor Responsibility Under or Overweight |
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|  MIL-W-3947B
from the "as weighed" condition as entered in the actual weight empty
determination. A diagram shall be provided showing the pertinent dimension
of the scale reactions with respect to the reference datums. Provisions
shall be made for the signature of a Government witness. A photograph may
be included with appropriate explanation of the procedure used. When
approved by the procuring agency, the actual weight and center of gravity
may be determined for each section of the vehicle in lieu of obtaining
the actual weight and center of gravity of the complete assembly. Weighings
shall provide for the determination of the weight empty. It is preferable
to make all weighings with the vehicle completely assembled and in the dry
condition (in liquid systems - before the fuel and oxidizer systems have been
filled). All mission load items, insofar as practicable, shall be removed
for weight empty weighings. Weights shall be determined by taking the
average of readings from three independent operations with a complete upset
and unloading of the weighing equipment. The lateral and vertical (Y and Z axis)
center of gravity may be determined by calculations when size or configuration
makes determination by physical means impracticable.
3.4.2.6 Derivation of Contractor Responsibility Under or Overweight.
This derivation shall be determined from the following tabulation:
(1) The weight Guarantee.
(2) The weight increases or decreases due to the total weights of
authorized changes, pending changes and the net under or over-
weight of the Government Furnished Equipment.
(3) The guarantee as modified by (2) above.
(4) Comparison of the actual weight with the revised guaranteed weight
derived in (3) above to obtain the contractor responsibility under
or overweight.
The under or overweight for a contract shall be taken as the average of the
under or overweight values of weight empty as shown by the Actual Weight and
Balance Reports submitted in accordance with contractual requirements.
3.4.2.7 Balance Calculation. Shown longitudinal, vertical and lateral
balance calculations for weight empty, mission loads and all phases of gross
conditions of the flight profile. The balance calculations shall be tabulated
when practicable in the same sequence and order shown on the Weight Statements
MIL-STD-176 Part II. Intermmediate Reports need not include the detail
balance calculations for MIL-STD-176 Part II. The longitudinal moment axis (X)
shall be so located that all moments will have the same sign; and it shall be
dimensioned from a convenient fixed point on the vehicle. Balance calculations
for the vertical or lateral (Y or Z axis) center of gravity (or for vehicles
which are symmetrical about one or more axis may include only those items
which are non-symmetrical about the axis of symmetry.
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