Downloaded from https://www.everyspec.com MIL-STD-3001-2A(AS) 5.2.4.2.3 Engine and engine system description work packages . A WP shall be developed to provide maintenance personnel with a basic description of the engine sysdesc >, including its purpose, type, series, and main features. A table of leading particulars, including dimensions, weight, and other basic engine data shall also be included. If more than one model of the engine is used, the significant differences shall be explained. In addition, a separate description WP for each major section or module of the engine shall also be prepared.
For usability or clarity, the descriptive data may be included within the principles of operation WPs (refer to 5.2.5.3 ). Separate description WPs for each related engine system sysdesc >, subsystem sysdesc >, and its major components sysdesc > shall also be prepared. As applicable, the description shall include the system's purpose, type, series, main features, and a table of leading particulars, including dimensions, and weight. 5.2.4.2.4 Programming software description work packages softwp >. WPs shall be developed to provide descriptive information for programming software used for aircraft systems, aeronautical equipment, and test equipment, when applicable.
Description of stimulus and measurement programming stim-measdesc >, programming statements statedesc >, and any programming tests or self tests progtestdesc > shall be prepared. A description of any microcircuit logic and associated diagrams shall also be included when necessary. Block diagrams, test setup diagrams, and pictorials of display readouts shall be included when necessary to support the descriptive narrative. All descriptive WPs may have an introduction intro >. 5.2.5 Principles of operation.
The principles of operation shall define the purpose and functions of the equipment, the technical characteristics, and other general information to be used by maintenance personnel to enable understanding of the equipment and its related systems, including integration. The operation of the system and related equipment/components shall be presented in a logical flow. Significant input, output, and control signals, supply voltages and power supply output voltages shall be identified. If the equipment operates in more than one mode, each mode shall be explained. Functional block diagrams shall be provided.
When the LSA/LMI/MP directs fault isolation to the bit and piece component(s), the principles of operation shall describe detailed circuitry. Internal circuits, their relationship to each other, input and output signals, waveforms and time-phase relationship to significant waveforms shall be included when required to understand detailed equipment operation. Presentation of the principles of operation shall be supported by program listings and functional flow, logic, or other diagrams required to ensure clarity of presentation. Logic diagrams may include system operational modes. These diagrams and other related illustrations shall be placed in the same WP as their related text.
Principles of operation for functionally significant nonrepairable items shall be described as necessary to support understanding of the system or equipment. Basic theory, normally found in textbooks, shall not be included. Principles of operation data shall be contained in the following types of WPs, as applicable: a. Aircraft weapon system principles of operation WPs. b. Aeronautical equipment, airborne weapons/equipment, and support equipment principles of operation WPs. 10