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An Approach to Verification of Interference Concerns for Multicore Systems (CAST-32A)

Rapita Systems, Inc., Ltd.-Steven H. VanderLeest, Christos Evripidou
  • Technical Paper
  • 2020-01-0016
To be published on 2020-03-10 by SAE International in United States
The avionics industry is moving towards the use of multicore systems to meet the demands of modern avionics applications. In multicore systems, interference can affect execution timing behavior, including worst case execution time (WCET), as identified in the FAA CAST-32A position paper. Examining and verifying the effects of interference is critical in the production of safety-critical avionics software for multicore architectures. Multicore processor hardware along with aerospace RTOS providers increasingly offers robust partitioning technologies to help developers mitigate the effects of interference. These technologies enable the partitioning of cores for different applications at different criticalities and make it possible to run multiple applications on one specific core. When incorporated into system-design considerations, these partitioning mechanisms can be used to reduce the effects of interference on software performance. In this paper we describe a novel approach to verifying the effectiveness of RTOS interference mitigation on the final hosted software. We showcase the use of the proposed approach on the NXP T2080 multicore board. The approach follows a V-model based methodology in which high- and low-level requirements…
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Adaptive Test Feedback LoopA Modelling Approach for Checking Side Effects During Test Executionfor Advised Explorative Testing

Bremer Inst. Für Produktion Und Logistik-Marco Franke, K. A. Hribernik
University of Bremen-K. D. Thoben
  • Technical Paper
  • 2020-01-0017
To be published on 2020-03-10 by SAE International in United States
The main objective of testing is to evaluate the functionality, reliability, and operational safety of products. However, this objective makes testing a complex and expensive stage in the development process. This is particularly true for complex and large systems, such as trains or aircrafts, which require maximum operational safety. From the perspective of an aircraft manufacturer, the checks are carried out via test cases on the integration, system and application levels. Thus, they certify the products against the requirements using black box testing approach. In doing so, a test plan defines a sequence of test cases whereby it sets up the environment, stimulates the fault, and then observes the system under test for each case. Subsequently, the post processing of the test execution classifies the test plan in passed or failed. The ongoing digitization and interconnectedness between aircraft systems is leading to a high number of test cases and a multitude of reasons why a specific test-case fails. A corresponding error analysis and adaptation of the test plan is a complex and lengthy process, which…
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Electrical Connectors for Aerospae, Shipboard, Ground Vehicles and Associated Equipment

AE-8C1 Connectors Committee
  • Aerospace Standard
  • ARP1308D
  • Current
Published 2020-01-21 by SAE International in United States
The intent of this ARP is to identify electrical connectors maintained by the AE-8C1 Committee, to provide their general application characteristics, associated configuration options, and recommendations for new design (see 6.1.1), repair, and retrofit purposes (see 6.1). It is acknowledged the connectors listed herein will not completely satisfy all mobility vehicle and equipment requirements, but optimization of the use of these components will facilitate standardization in the form of maximum utilization of a minimum variety of connectors. This ARP only pertains to AS connector standards. See MIL-STD-1353 for U.S. military specification connector information.
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Employing the Electrical Digital Twin to Mitigate Compliance Risk in Aerospace

  • Magazine Article
  • TBMG-35688
Published 2019-12-01 by Tech Briefs Media Group in United States

Delivering aircraft and various avionics compliant with the latest standards and regulations is increasingly difficult. Today, it’s not uncommon for a single commercial aircraft to comprise hundreds of line-replaceable units, hundreds of miles of wire, and unique configurations throughout all parts of a platform that must meet numerous certification requirements. With increasing electrical system content and complexity, a single change during the design, verification, or compliance process can put the entire program in jeopardy. With the rise in electrification and design complexity, aerospace original equipment manufacturers (OEMs) need to look for new methodologies to mitigate compliance risk.

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The Research on Validation and Verification Method of Configuration Data for IMA Resources Allocation

CETC Avionics Co., Ltd.-Yan-xiao Li
UESTC; CETC Avionics Co., Ltd.-Yunsheng Wang
Published 2019-09-16 by SAE International in United States
Integrated Modular Avionics (IMA) system comprises IMA platform and hosted applications. The IMA platform provides the hosted applications with shared resources, e.g. computing, memory, communication, health monitoring resources. As a bridge between them, the IMA configuration data specifies how these shared resources are allocated to each hosted application. The IMA configuration data, which is different from real hardware and software code, should be validated and verified as an important portion of IMA system. After a brief introduction of IMA system, development processes, and general means of compliance for certification, this paper proposed an Architecture Analysis and Design Language (AADL) model of IMA configuration based on a case study of airborne datalink system. Based on the model, the IMA configuration data is abstracted and categorized into several types, with the correspondent means of compliance identified for each type. Furthermore, the associated roles and responsibilities are discussed for IMA configuration data validation and verification. The IMA configuration data specific means of compliance, the validation and verification processes, the roles and responsibilities, together form a method for validating…
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The Right Stuff for Aging Electronics/Intermittence/No Fault Found

Universal Synaptics-Hector I. Knudsen
Published 2019-09-16 by SAE International in United States
For those in the avionics repair and maintenance business, the acronyms NFF (No Fault Found), NTF (No Trouble Found), and CND (Cannot Duplicate) are, unfortunately, all too familiar terms. After several decades of frustration with this illusive phenomenon, it continues to consume an enormous amount of test and diagnostic effort and is the source of considerable cost and discomfort within the multi-level avionics repair model.There are undoubtedly many causes of NFF and all of them should be addressed. The question is: Where do you start and which solution will be the most beneficial?Our particular efforts have focused on the literal or statistical analysis of NFF, recognizing that if the system’s MTBF (Mean Time Between Failure) has decreased, or if the device's NFF rate has increased with age and deterioration, a physical fault is most likely present. However, if it isn’t found during conventional testing then it probably only fails intermittently. Similarly, having an intermittent failure mode, it in all probability cannot be detected or diagnosed at testing time because of known and demonstrated limitations in…
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Data Recorder and Mission Computer

  • Magazine Article
  • TBMG-35112
Published 2019-09-01 by Tech Briefs Media Group in United States

Curtiss-Wright Corporation Ashburn, VA 703-779-7800

Understanding Fiber Optic Transceiver Design and Test Rules

  • Magazine Article
  • TBMG-35119
Published 2019-09-01 by Tech Briefs Media Group in United States

The design of avionics systems must balance several factors. First, engineers want to increase the performance of the systems installed in aircraft or spacecraft. Second, they want to reduce the size and weight of the equipment that must be carried. Third, they want to maximize the safety of the in-flight systems and maintain communication between the aircraft or spacecraft and other flight vessels and the command center, regardless of the circumstances.

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Understanding Fiber Optic Transceiver Design and Test Rules

Aerospace & Defense Technology: September 2019

  • Magazine Article
  • 19AERP09_03
Published 2019-09-01 by SAE International in United States

The design of avionics systems must balance several factors. First, engineers want to increase the performance of the systems installed in aircraft or spacecraft. Second, they want to reduce the size and weight of the equipment that must be carried. Third, they want to maximize the safety of the in-flight systems and maintain communication between the aircraft or spacecraft and other flight vessels and the command center, regardless of the circumstances.

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Flight Computer

  • Magazine Article
  • TBMG-35114
Published 2019-09-01 by Tech Briefs Media Group in United States

Abaco Systems Huntsville, AL 866-652-2226