MODUK - DEF STAN 00-69: PART 2
Aircraft/Store Electrical Interconnection System Part 2: Design Principles and Practices for, and Guide to, the Implementation of the Aircraft/Store Electrical Interconnection System
|Publication Date:||20 February 1998|
Purpose. The standard has a significant impact on the system design of related avionics systems, such as th Stores Management System (SMS), analogue data transfer equipment, the Power Distribution System (PDS) and Data Transfer Equipment (DTE). It also impacts the design of the stores themselves. It is anticipated that this guide will provide useful information to; Aircraft Prime Contractors, Avionics and Store System Designers, System Integrators and Equipment Users.
This guide was prepared to increase their awareness of available methods for improving aircraft/store interoperability. In addition, it recommends specific design and fabrication practices, and provides aircraft and store designers with sufficient engineering data to implement Def Stan 00-69 requirements. Additionally, it is the purpose of this guide to emphasise to the aircraft and store designer the importance of the complete weapons systems approach to the solution of the interoperability problem. The systems approach is one that recognises the interrelationships of components and parts within the system, aircraft and store, and the interactions between aircraft and store in the system.
While it is recognised that each weapon system is somewhat unique, an effort has been made to present recommended design practices in a manner that will assist the designer to adapt various recommendations to his particular situation. It should be recognised, however, that any given design practice may not be equally effective in all weapon systems. The use of this guide must be complimented, therefore, by sound engineering judgement.
Coverage. The material contained in this guide is intended to provide the weapon system designer with three basic types of information. These are:
(a) a thorough understanding of the requirements imposed by Def Stan 00-69;
(b) an identification of design problem areas that could contribute to an interface incompatibility;
(c) a presentation of design techniques, components and design practices that offer suggestions for implementing Def Stan 00-69;
(d) practical guidance and associated rationale for implementors of Def Stan 00-69 in future applications.
For most weapon systems, a low level of interoperability is inevitable unless the designer recognises the design risks, is aware of their causes and available means of minimising the risks and organises all phases of the weapon system development in the original design to enhance interoperability. Retrofitting after an interoperability problem is discovered is expensive and seldom contributes to weapon system reliability.
The complete Aircraft/Store Electrical Interconnection System (AEIS) is comprised of three elements: Electrical, Physical and Logical. The electrical element specifies the aircraft-to-store interface signal set and associated electrical characteristics including interrelationships between the various interfaces. The physical element specifies the mechanical aspects necessary for achieving intermateable electrical connections within the system. The logical element defines interconnection system aspects such as the communication protocol, formatting rules for messages and standard data words.
The electrical interface is comprised of two signal sets, a Primary Signal Set and an Auxiliary Signal Set. Both signal sets are applicable to the ASI and MSI.
Limitations. Areas of Def Stan 00-69 discussion not thoroughly covered in this guide are as follows:
(1) Aircraft and stores compatibility relating to mechanical, aerodynamic, logistic and operational factors. Size, shape, loads, clearances and functional limitations are not specified in Def Stan 00-69.