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A Dynamic Fault Tree Approach for Time-Dependent Logical Modeling of Autonomous Flight Systems

Cobham Mission Systems Inc-John Wang
Published 2019-03-19 by SAE International in United States
This paper addresses the urgent need for adequate methodologies to use in analyzing autonomous flight systems, including Unmanned Aircraft. These systems are inherently dynamic and require analysis that is explicitly time dependent. Autonomous flight systems are becoming more commonly used, especially for Part 23 aircraft including Business (Corporate) and Regional Jets or Unmanned Aircraft deployed in hazardous environment/situation. Such systems are expected to make their own decisions under uncertain conditions caused by potential system structure changes when entering a new flight phase or switching to a new system configuration due to system degradation or failure(s) [1]. This paper highlights significant modeling errors that can arise in analyzing dynamic scenarios where these time dependencies are ignored. Model-based solutions are provided by incorporating a time-dependent algebraic formalism into Fault Tree Analysis (FTA) and Dependency Diagram (DD) with updated descriptions in SAE ARP4761A and ARP4754B (Note: These are currently under development). A Dynamic Goal Tree (or alternatively, a Dynamic Dependency Diagram) provides an effective implementation of the time-dependent logic for dynamic system analysis analyzing autonomous flight systems which…
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ADVANCED FLIGHT MANAGEMENT COMPUTER SYSTEM

Airlines Electronic Engineering Committee
  • ARINC Standard
  • ARINC702A-5
  • Current
Published 2018-08-28 by SAE Industry Technologies Consortia in United States

The Advanced FMCS provides expanded functions beyond that defined in ARINC 702 to support the anticipated requirements for operation in the CNS/ATM operating environment. GNSS and RNP based navigation, air-to-ground data link for communications and surveillance, and the associated crew interface control/display definitions are included.

 

Vehicle Management Systems - Flight Control Function, Design, Installation and Test of Piloted Military Aircraft, General Specification For

A-6A3 Flight Control and Vehicle Management Systems Cmt
  • Aerospace Standard
  • AS94900A
  • Current
Published 2018-08-13 by SAE International in United States
This SAE Aerospace Standard (AS) provides the general performance, design, installation, test, development, and quality assurance requirements for the flight control related functions of the Vehicle Management Systems (VMS) of military piloted aircraft. It also provides specification guidance for the flight control interfaces with other systems and subsystems of the aircraft.
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ATP360 An Air Carrier First Officer Training Program

G-10G Realistic Training Committee
  • Aerospace Standard
  • AIR6319
  • Current
Published 2018-05-24 by SAE International in United States
ATP360 air carrier training applies to pilots holding a commercial certificate with instrument and multi-engine ratings. This document describes how the ATP360 program achieves its objectives: to educate and train qualified pilots for First Officer and eventually Captain positions with the regional and/or the major airlines. This document also provides an overview of a selection process, an academic curriculum, a flight training program, faculty preparation, and program evaluation. The focus of ATP360 is to develop industry-recognized competencies and instill the knowledge, skills and attitudes required to bring persons up to professional air carrier standards.
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General Requirements for WDM Backbone Networks

AS-3 Fiber Optics and Applied Photonics Committee
  • Aerospace Standard
  • AIR6005
  • Current
Published 2018-01-23 by SAE International in United States
This document (AIR6005) provides the framework for the specifications of a WDM OBN within the SAE AS5659 WDM LAN Specification document family, in particular, the Transparent Optical Backbone Network Specification. This framework includes potential requirements, technical background, investigation and context to support the writing of SAE’s WDM LAN specifications documents. The SAE’s AS6005 WDM OBN document describes a transparent optical network which contains optical components and optical interfaces to perform optical transport, optical add/drop, optical amplification, optical routing, and optical switching functions. The conforming optical signal interfaces for the data plane of the WDM OBN are defined. The conforming signal interfaces for the control and management planes of this network are also defined. The control and management plane signals may be either electrical or optical. If successful, a WDM LAN standard is anticipated to include multiple variants that may get created either as separate documents (e.g. a multimode and single-mode specification) and additional documents may be needed to specify the components from which a WDM LAN and OBN will be built. The WDM OBN specification…
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Guide to Civil Aircraft Electromagnetic Compatibility (EMC)

AE-4 Electromagnetic Environmental Effects (E3) Committee
  • Aerospace Standard
  • ARP60493
  • Current
Published 2017-10-25 by SAE International in United States
This guide provides detailed information, guidance, and methods for demonstrating electromagnetic compatibility (EMC) on civil aircraft. This guide addresses aircraft EMC compliance for safety and functional performance of installed electrical and electronic systems. The EMC guidance considers conducted and radiated electromagnetic emissions and transients generated by the installed electrical and electronic systems which may affect other installed electrical and electronic systems on the aircraft. Application of appropriate electrical and electronic equipment EMC requirements are discussed. Methods for aircraft EMC tests and analysis are described. This guide does not address aircraft compatibility with the internal electromagnetic environments of portable electronic devices (PED) or with the external electromagnetic environments, such as high-intensity radiated fields (HIRF), lightning, and precipitation static.
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Modelling and Simulation Tools for Systems Integration on Aircraft

Aerospace & Defense Technology: June 2017

  • Magazine Article
  • 17AERP06_03
Published 2017-06-01 by SAE International in United States

The provision of integrated modeling, simulation and optimization tools to effectively support all stages of aircraft design remains a critical challenge in the aerospace industry. While several breakthroughs have been achieved in this area, costly iterations are still often necessary to successfully design, develop, integrate, validate and verify the components and subsystems of modern aircraft. The high level of system integration that is characteristic of new aircraft designs is dramatically increasing the complexity of both design and verification - in particular for fault condition analysis and the implementation of defect-free software (Figure 1).

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Modelling and Simulation Tools for Systems Integration on Aircraft

  • Magazine Article
  • TBMG-26992
Published 2017-06-01 by Tech Briefs Media Group in United States

The provision of integrated modeling, simulation and optimization tools to effectively support all stages of aircraft design remains a critical challenge in the aerospace industry. While several breakthroughs have been achieved in this area, costly iterations are still often necessary to successfully design, develop, integrate, validate and verify the components and subsystems of modern aircraft. The high level of system integration that is characteristic of new aircraft designs is dramatically increasing the complexity of both design and verification – in particular for fault condition analysis and the implementation of defect-free software (Figure 1).

 

Autopilot, Flight Director, and Autothrust Systems

S-7 Flight Deck Handling Qualities Stds for Trans Aircraft
  • Aerospace Standard
  • ARP5366
  • Current
Published 2017-01-04 by SAE International in United States
This document recommends criteria for the design and installation of Autopilot, Flight Director and Autothrust Systems. These three systems are highly interrelated and will be referred to generically as an Integrated Flight Guidance System (IFGS).
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Flight Management Systems Review

S-7 Flight Deck Handling Qualities Stds for Trans Aircraft
  • Aerospace Standard
  • AIR4653
  • Current
Published 2017-01-04 by SAE International in United States
The information contained in this document is based on line experience with current systems. It should be used as a basis for ongoing research and development including the human factors aspects of future flight management systems and their interaction with the ATC environment.
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