Note: General requirements shall be to MIL-STD-490A, Documentation Standard, DEF STAN 05-28, and MIL-STD-483A.
This Specification establishes the performance, design, development, and test requirements for the insert Item Name, if applicable insert abbreviation, insert Item (Equipment, RU, etc) code critical item used on the ???? system.
State the purpose of the system, and identify the major functions the critical item performs and describe the role of the critical item within the system or segment of which it is part.
This Development Specification has been produced during the Preliminary Design Phase, for compliance with the Systems Engineering Management Plan (SEMP).
Before completion of the Critical Design Review (CDR) for the HWCI this specification will establish of the Allocated Baseline and subject to change using the Configuration Management Plan.
This document has been compiled in
the following order.
Insert here any other information to summarize any other items regarding the purpose and contents of the document.
SYSTEMS ENGINEERING MANAGEMENT PLAN (SEMP)
CONFIGURATION MANAGEMENT PLAN
Identify here by title and identifier any other project specific documents referenced by this document (i.e., System/Subsystem Specification, etc) and not identified in any higher level documents.
List by title and Identifier, any other documents referenced by this document and not identified in any higher level documents.
e.g., STANDARDS, SPECIFICATIONS, DRAWINGS
and OTHER PUBLICATIONS.
Insert here a comprehensive definition of the critical item to be developed.
Where applicable, a definition of the system or configuration item shall be provided in the form of a brief description, and shall: identify major physical parts, functional areas and functional and physical interfaces; and shall include system logic diagrams, block diagrams, schematic diagrams, and pertinent operational, organizational and logistic considerations and concepts.
Development specifications shall specify all required performance characteristics, physical characteristics, and requirements for reliability, maintainability, relative priority of design disciplines or characteristics.
Performance characteristics shall state
what the critical item shall do, including both upper and lower
performance limits. As a general guide include such considerations
as:
These characteristics shall include general and detail requirements, under appropriate sub-headings, for all performance requirements, i.e., what is expected of the system, configuration item, or material.
This paragraph shall include the following,
as applicable:
This paragraph shall state the requirements for reliability in quantitative terms, defining the conditions under which the requirements are to be met.
Reliability requirements shall be stated numerically with confidence levels, if appropriate, in terms of mission success or hardware mean time between failures. Initially, reliability may be stated as a goal and a lower minimum acceptable requirement. During contract definition, or equivalent period, realistic requirements shall be determined and incorporated in the specification.
This paragraph shall specify the quantitative maintainability requirements. The requirements shall apply to maintenance in the planned maintenance in the planned maintenance and support environment and shall be stated in quantitative terms.
Numerical maintainability requirements shall be stated in such terms as mean-time-to-repair (MTTR) or maintenance man-hours per flight/operational hour. Determination of realistic requirements shall be made as discussed in 3.2.3 for reliability. Quantitative requirements for accessibility, modular construction, test points, and other design requirements may be specified as required.
Describe both induced and natural environmental conditions expected to be encountered by this critical item during storage, shipment, and operation. It shall include factors such as climate, shock, vibration, noise, and noxious gases.
This paragraph shall include the requirements for transportability which are common to all components to permit employment, deployment, and logistic support. All components that, due to operational or functional characteristics, will be unsuitable for normal transportation methods shall be identified.
This paragraph shall specify minimum critical item design and construction standards that have general applicability and are applicable to major classes of equipment (e.g., aerospace vehicle equipment, support equipment) or are applicable to particular design standards. To the maximum extent possible, these requirements shall be specified by reference to the established military standards and specifications. In addition, this paragraph shall specify criteria for the selection and imposition of National, military, and contractor specifications and standards.
Minimum or essential requirements that are not controlled by performance characteristics, interface requirements, or referenced documents shall be specified. They shall include appropriate design standards, requirements governing the use or selection of materials, parts and processes, interchangeability requirements, safety requirements, and the like.
This paragraph shall specify those configuration item-peculiar requirements governing use of materials, parts, and processes to be utilized in the design of the critical item. It shall also contain specifications as necessary for particular materials and processes to be utilized in the design of the critical item. Special attention shall be directed to prevent unnecessary use of strategic or critical materials. A strategic and critical materials list can be provided from the contracting agency. In addition, requirements for the use of standard and commercial parts for which qualified products lists have been established shall be specified here.
Requirements for materials to be used in the item or service covered by the specification shall be stated under this heading, except where it is more practicable to include the information in other paragraphs. Requirements of a general nature should be first, followed by specific requirements for the material. Definitive documents cover materials of the required quality.
Where applicable, requirements pertaining to electromagnetic radiation shall be stated in terms of the environment which the item must accept and the environment which it generates.
This paragraph shall contain requirements for nameplates, part marking, serial and lot number marking, and all other identifying markings required for the critical item and its component parts. Requirements shall usually be stated in general terms and reference made to existing standards on the content and application of such markings.
The nameplate or markings in some cases may be the only means of identification of a product after delivery. Such identification is important from the stand-point of stack, replacements, and repair parts. All requirements pertaining to nameplates or markings shall be placed under this, or other appropriate heading, referencing applicable specifications, drawings, or standards.
This paragraph shall contain workmanship requirements for development models (A and B) of critical items to be produced during development, including requirements for manufacture by production techniques, if applicable.
This paragraph shall identify those components to be interchangeable and replaceable. Entries in this paragraph are for the purpose of establishing a condition of design, and are not to define the conditions of interchangeability that are required by the assignment of a part number.
This paragraph shall specify requirements to preclude or limit hazard to personnel and equipment. To the extent practicable, these requirements shall be imposed by citing established and recognized standards. Limiting safety characteristics peculiar to the critical item due to hazards in assembly, disassembly, test, transport, storage, operation and maintenance shall be stated when covered neither by standard industrial or service practices nor by a higher level specification. "Fail safe" and emergency operating restrictions shall be included when applicable. These shall include interlocks and emergency and standby circuits require to either prevent injury or provide for recovery of the critical item in the event of failure.
Human engineering requirements for the critical item should be specified herein and applicable documents (e.g., MIL-STD-1472, DEF STAN ) included by reference. This paragraph should also specify any special or unique requirements, e.g., constraints on allocation of functions to personnel and communications and personnel/equipment interactions. Included should be those specific areas, stations, or equipment which would require concentrated human engineering attention due to the sensitivity of the operation or criticality of the task, i.e., those areas where the effects of human error would be particularly serious.
This paragraph shall specify the plan for critical item documentation such as: specifications, drawings, technical manuals, test plans and procedures, installation instruction data in general terms.
Requirements for documenting the design shall specify types of documents required for design review and approval (establishment of the allocated baseline of the item), manufacture or procurement, testing, inspection installation, operation, maintenance, and logistic support as appropriate.
This paragraph is not intended as a requirement for procurement or delivery of data (DRL).
Were applicable, logistic considerations and conditions that will apply to the system or configuration item shall be specified in development specifications. Logistic conditions such as maintenance considerations, modes of transportation, supply system requirements, and impact on existing facilities and equipment's shall be considered.
This paragraph shall include considerations
such as:
This paragraph shall specify the impact of the critical item on the supply system and the influence of the supply system on critical item design and use.
Considerations shall include:
This paragraph shall either specify the order of precedence of requirements or assign weights to indicate the relative importance of characteristics and other requirements. It shall also establish the order of precedence of this specification relative to referenced documents e.g., specification over drawings, functional requirements over physical requirements, etc.
This paragraph shall discuss the philosophy of testing, location for performance of tests, and other information related to testing not covered elsewhere. For software embedded in firmware devices, the application of quality assurance provisions or qualification requirements depends on whether the software is designated as a CSCI or part of an HWCI. When the software is designated as a CSCI, Qualification Requirements apply, but when designated as part of a HWCI, Quality Assurance Provisions apply.
Where applicable, the general test and inspection philosophy shall be described with a statement of responsibility for inspection, classification of examinations and tests, sampling, lot formation, and other information pertinent to the quality assurance provisions but not directly associated with a specific test or examination.
For hardware, this section shall include all of the examinations and tests (by reference where applicable) to be performed in order to ascertain that the product, material or process to be developed or offered for acceptance conforms to the requirements in Sections 3 and 5 of the specification.
This paragraph shall assign responsibilities for performance of tests to each agency, Government or contractor, as applicable.
The concept of quality assurance places primary responsibility for quality assurance of delivered products, materials or services on the supplier who is responsible for offering to the contracting agency only those products, materials or services that conform to all specified requirements. Accordingly, the supplier's responsibility for testing shall be clearly stated and the contracting agency's role, either as a partner or monitor, shall be specified.
This paragraph is optional in a development specification, and when used, would generally cover testing requirements for qualification evaluation for selection of parts, components, or equipment's to be used in the item.
This paragraph shall cover, or reference, test and inspection requirements necessary to determine if all requirements of Section 3 of the specification have been achieved. Insofar as practical, tests shall be arranged in a logical order for sequential performance.
Include here the verification matrix which will provide for the correlation of Section 3 performance requirements with Section 4 verification requirements. The CMP provides an example verification cross-reference matrix.
This section shall provide guidance for the preparation of the critical item for delivery. Such guidance will be particular to the critical item being specified and other than standard practice. It shall include such non-standard practices in appropriate configuration item descriptions. It may impose requirements to comply with standard practices by referencing appropriate military specifications, and standards.
All definitions, abbreviations and acronyms contained in the Systems Engineering Management Plan are applicable to this document, however for convenience a number of them are repeated here.
Include in this section any general information that aids in understanding this document; a number of paragraphs can be written but as a minimum the next three shall be included.
Include here information relative to the use of the HWCI covered by this specification, e.g., "This specification is to be used as the Hardware Allocated Baseline for the (name of HWCI) HWCI for the ???? system."
Most of these definitions are taken
from the SEMP, if not their source is included.
- include here, in alphabetic order,
any other definition as necessary.
- include here in alphabetic order
all the other abbreviations and acronyms used in this document
This section of the specification shall contain requirements which are contractually a part of the specification but which, for convenience in specification maintenance, are incorporated herein, e.g., requirements of a temporary nature or for a limited effectivity. Appendixes may be bound as separate documents for convenience in handling, e.g., when only a few parameters of the critical item are classified, an appendix containing only the classified material may be established. Where parameters are placed in an appendix, the paragraph of section 10 shall be referenced in the main body of the critical item specification in the place where the parameter would normally have been specified.
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