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A Systematic Approach to Development Assurance and Safety of Unmanned Aerial Systems

Textron Aviation-Cory R. Laflin
  • Technical Paper
  • 2020-01-0043
Published 2020-03-10 by SAE International in United States
The unrestrained design space for unmanned aerial systems (UAS) presents challenges to accurate safety assessment and the assurance of development to appropriate levels of rigor within those systems. The established safety and development assurance standards and practices were developed for vehicles operating in highly controlled conditions with continuous oversight. The very nature of unmanned systems introduce new failure conditions, even in those systems operating within the strict rules of the National Airspace System (NAS), particularly failures of control and command, situational awareness, and control security. Beyond those, the new concepts of operation being conceived by UAS developers introduce their own new set of considerations with regards to operating in uncontrolled airspace, often in close proximity to bystanders. These new concepts require new technologies beyond those currently supported by the hardware and software development assurance processes. However, the established standards and practices of aircraft development assurance and safety assessment can be adapted for the broader world of UAS applications, provided that the considerations driven by the new concepts of operation can be identified and properly analyzed.…
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Multi-Objective Flight Control Optimization Framework

  • Magazine Article
  • TBMG-36201
Published 2020-03-01 by Tech Briefs Media Group in United States

Composite materials are used in aerospace design because of their high strength-to-weight ratio. On modern airplanes, composite wings offer a greater degree of aerodynamic efficiency due to weight savings but at the same time introduce more structural flexibility than their aluminum counterparts. Under off-design flight conditions, changes in the wing shape due to structural flexibility cause the wing aerodynamics to be non-optimal. This effect could offset any weight-saving benefits realized by the composite wings. Structural flexibility could also cause adverse interactions with flight control and structural vibration that can compromise aircraft stability, pilot handling qualities, and passenger ride quality.

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Aerospace - Impulse Testing of Hydraulic Components

A-6 Aerospace Actuation, Control and Fluid Power Systems
  • Aerospace Standard
  • ARP1383C
  • Current
Published 2020-02-24 by SAE International in United States
This SAE Aerospace Recommended Practice (ARP) defines impulse test procedures that are recommended for hydraulic components.
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Contiguous Aircraft/System Development Process Example

S-18 Aircraft and Sys Dev and Safety Assessment Committee
  • Aerospace Standard
  • AIR6110
  • Current
Published 2020-02-05 by SAE International in United States
This AIR provides a detailed example of the aircraft and systems development for a function of a hypothetical S18 aircraft. In order to present a clear picture, an aircraft function was broken down into a single system. A function was chosen which had sufficient complexity to allow use of all the methodologies, yet was simple enough to present a clear picture of the flow through the process. This function/system was analyzed using the methods and tools described in ARP4754A/ED-79A. The aircraft level function is “Decelerate Aircraft On Ground” and the system is the braking system. The interaction of the braking system functions with the aircraft are identified with the relative importance based on implied aircraft interactions and system availabilities at the aircraft level. This example does not include validation and verification of the aircraft level hazards and interactions with the braking system. However, the principles used at the braking system level can be applied at the higher aircraft level. The methodologies applied here are an example of one way to utilize the principles defined in…
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Attack Reconnaissance Helicopter

  • Magazine Article
  • TBMG-36063
Published 2020-02-01 by Tech Briefs Media Group in United States

Bell Textron Inc Fort Worth, TX +1 817-280-2011

CAESAR Plug-in for MagicDraw

  • Magazine Article
  • TBMG-35983
Published 2020-02-01 by Tech Briefs Media Group in United States

The CAESAR software is a plug-in for No Magic's MagicDraw tool that allows users to capture a model of a flight system architecture at various levels of abstraction while maintaining consistency of the system design information, products, and artifacts that are commonly used in flight system design such as block diagrams that capture the system topology. Each level of abstraction is characterized by a model of components, interfaces, signals, and channels. These fundamental constructs are annotated by ontologies to provide semantics and context for architecture models at each level of abstraction. The plug-in manages consistency between models of the flight system architecture and projected views from the set of defined architecture models, and allows for annotating semantics by creating and applying metamodels that capture domain-specific concepts using the profiling mechanism in Magic-Draw. Projected views are described in specific block diagrams, tables, reports, and other documentation.

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Specification Guide for Power Drive Units (PDUs)

A-6B3 Electro-Mechanical Actuation Committee
  • Aerospace Standard
  • ARP5384
  • Current
Published 2020-01-06 by SAE International in United States
This Recommended Practice provides a guide for specifying general design, performance, and test requirements for power drive units (PDUs) for flight controls and other applications.
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In-Service Reliability Data of Continuously Active Ball Screw and Geared Flight Control Actuation Systems

A-6B3 Electro-Mechanical Actuation Committee
  • Aerospace Standard
  • AIR5713A
  • Current
Published 2019-10-14 by SAE International in United States
This Aerospace Information Report (AIR) has been written to provide in-service reliability data of continuously active ball screw and geared flight control actuation systems.
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Aircraft Electrical Installations

AE-8A Elec Wiring and Fiber Optic Interconnect Sys Install
  • Aerospace Standard
  • ARP4404C
  • Current
Published 2019-09-19 by SAE International in United States
It is the purpose of this document to present design recommendations that will provide a basis for satisfactory and safe electrical installations in transport aircraft. This document is not intended to be a complete electrical installation design handbook. However, the requirements for safety extend so thoroughly throughout the electric systems that few areas of the installation are untouched by the document. It is recognized that individual circumstances may alter the details of any design. It is, therefore, important that this document not be considered mandatory but be used as a guide to good electrical application and installation design. Transport aircraft electric systems have rapidly increased in importance over a number of years until they are now used for many functions necessary to the successful operation of the aircraft. An ever increasing number of these functions are critical to the safety of the aircraft and its occupants. The greatly increased power available in electric systems is another factor in aircraft safety. These considerations make it essential that aircraft electrical design practices be carefully considered from the…
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Rugged Network File Servers

  • Magazine Article
  • TBMG-35117
Published 2019-09-01 by Tech Briefs Media Group in United States

Ampex Data Systems Hayward, CA 650-367-2011