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MIL-STD-176 Revision A, May 27, 1963
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Includes all amendments and changes through Interim Notice 1, November 27, 1997
Additional Comments: INACTIVE FOR NEW DESIGN
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This document establishes weight statements and forms for procurement of weight and balance data for guided missiles, PARTS I, II and III hereof, states the principles followed in the formulation of these statements and forms, furnishes instructions where necessary for uniform compilation of the required weight and descriptive data, and provides a glossary of terms for which definitions may not be self evident on the weight statements and forms. The forms may be used for large and small missiles as well as booster vehicles employed for launching satellite or reentry payloads.

The detail and summary weight statements have been predicated on the following basic concepts:

(a) The primary purposes of the weight data are to provide information in the most advantageous form for development and improvement of guided missiles weight estimating and optimization methods and for mass characteristics control during design, construction and operational use of these vehicles. Such data and methods serve the significant functions of bringing avoidable adverse trends to light at an early state, pointing out areas in which design weight control can be most fruitful, establishing realistic weight goals, evaluating on a rational basis the weight costs of design features during evaluation of new configurations, determining the deviations (from planned weight or mass characteristics) which occur under actual test or operating conditions, and providing timely controlled weight input to flight trajectory planning for changes during design and operation.

(b) The secondary purpose of the weight data is to provide reasonably detailed information for engineering checking and reference purposes.

The following principles have been followed to implement the above basic concepts:

(a) The total missile weight is subdivided into functional and identifiable divisions that best serve the basic concepts for both large and small missiles. The missile is subdivided into identifiable steps and/or sections as shown in Figure 1 as an example. This breakdown is accomplished by the use of vertical columns in the reporting forms which must be properly identified at the top of each column. This makes it possible to handle multistage vehicles and also to give sectionalized breakdowns of smaller missiles. It is permissible to use the vertical columns for sectional breakdowns within a step of a multistage vehicle by using more than one column for a single step. However, once a particular arrangement of columns has been established dividing the vehicle into steps and/or sections, the same arrangement must be used throughout the form for that particular missile.

(b) Within the step and/or section breakdown, the weight has been broken down into functional and identifiable major and minor components. Insofar as practicable, all tangible and readily identifiable components and provisions for a specific function or installation have been allocated to the functional group, regardless of geographic location and physical method of attachment. Where compromise of this principle was necessary because of multi-purpose function, items have been allocated geographically with as complete functional isolation and identification as possible. Examples of multipurpose items are doors and panels which serve as closures for a structural surface as well as a particular installation function, and items which, because of their integral nature, make quantitative allocation impractical.

(c) The importance of consistent allocation of weights by all contractors in completing the detail statement has been recognized. The amplifying instructions herein are furnished to insure consistency in allocation to the greatest extent practicable.