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  • ASTM
    F3269-21 Standard Practice for Methods to Safely Bound Behavior of Aircraft Systems Containing Complex Functions Using Run-Time Assurance (Redline)
    Edition: 2021
    $144.00
    Unlimited Users per year

Description of ASTM-F3269 2021

ASTM F3269-21

Redline Standard: Standard Practice for Methods to Safely Bound Behavior of Aircraft Systems Containing Complex Functions Using Run-Time Assurance




ASTM F3269

Scope

1.1 The scope of this practice includes the following:

1.1.1 A set of components that comprise an RTA system.

1.1.2 Requirements and best practices to determine safe boundaries and RTA system coverage.

1.1.3 Requirements and best practices for an RTA system and RTA components, as applicable.

1.1.4 Appendixes with examples that demonstrate key RTA system concepts.

1.2 RTA components are required to meet the design assurance level dictated by a safety assessment process. Guidance for the safety assessment process may be found in references appropriate for the intended operations (ARP4754A, ARP4761, Practice F3178, etc.).

1.3 This practice was developed with UAS in mind. It may be applicable for aspects of manned aircraft certification/approval, as well as aviation ground systems. The scope of this practice is also envisioned to allow a variety of aircraft implementations where a human may perform the role of either the Complex Function or a Recovery Function.

1.4 The scope of this practice does not cover aspects of hardware/software integration. These should be considered separately during the development process.

Note 1: This practice does not suggest a one-size-fits-all strategy knowing that not all use cases may fit well into this architecture. There may exist additional components required to satisfy specific applications to the practice.

1.5 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.

1.6 Table of Contents: 

Title

Section

Introduction

 

Background

 

Scope

1

Referenced Documents

2

 

ASTM Standards

2.1

 

FAA Advisory Circular

2.2

 

RTCA Standards

2.3

 

SAE Standards

2.4

Terminology

3

 

Unique and Common Terminology

3.3

 

Definitions of Terms Specific to This Standard

3.4

 

Abbreviations

3.5

Significance and Use

4

RTA Functional Architecture

5

 

Overall Architecture

5.4

 

 

Components and Interfaces

5.4.1

 

 

RTA System Coverage

5.4.2

 

 

RTA Scenarios

5.4.3

 

 

 

Event Sequencing and Timing

5.4.3.8

 

 

Best Practices

5.4.4

 

 

Requirements

5.4.5

 

RTA Interfaces

5.5

 

Input Manager

5.6

 

 

Description

5.6.1

 

 

Requirements

5.6.2

 

Safety Monitor

5.7

 

 

Requirements

5.7.2

 

RTA Switch

5.8

 

 

Description

5.8.1

 

 

Requirements

5.8.2

 

Recovery Function

5.9

 

 

Description

5.9.1

 

 

Best Practices

5.9.2

 

 

Requirements

5.9.3

Keywords

6

Ground Collision Avoidance System (GCAS) as an Example
  RTA

Appendix X1

 

Introduction

 

 

Unassured Function

X1.1

 

RTA Required Inputs

X1.2

 

RTA Input Manager

X1.3

 

Safety Monitor

X1.4

 

Recovery Function

X1.5

 

RTA Switch

X1.6

 

Vehicle Management System

X1.7

Machine Learning AI Autopilot (MLAA)

Appendix X2

 

Introduction

 

 

Assured and Unassured Data

X2.1

 

Input Manager

X2.2

 

Complex Function

X2.3

 

Safety Monitors

X2.4

 

Recovery Control Function

X2.5

 

RTA Switch

X2.6

 

Summary

X2.7

Run-Time Assurance for a Neural Network-Based Adaptive
  Flight Control of an Unmanned Aircraft

Appendix X3

 

Visual Line-of-Sight Operations

X3.1

 

Beyond Visual Line-of-Sight Operation

X3.2

Run-Time Assurance for Risk-Based Operation

Appendix X4

Example Implementation of Timing and Latency Requirement

Appendix X5

References

 

1.7 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.8 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


Keywords

adaptive; airworthiness; artificial intelligence; assurance; automated; autonomous software; autonomy; certification; complex; control systems; deep neural networks; fuzzy logic; machine learning; online verification; reinforcement learning; run-time assurance; safety; safety monitor; security; software; unmanned aircraft system; validation; verification;


ICS Code

ICS Number Code 49.020 (Aircraft and space vehicles in general)


DOI: 10.1520/F3269-21



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