IEC TS 62396-1:2006

Process management for avionics - Atmospheric radiation effects - Part 1: Accommodation of atmospheric radiation effects via single event effects within avionics electronic equipment

Provides guidance on atmospheric radiation effects on avionics electronics used in aircraft operating at altitudes up to 60 000 feet (18,3 km). Defines the radiation environment, the effects of that environment on electronics and provides design considerations for the accommodation of those effects within avionics systems. Is intended to help aerospace equipment manufacturers and designers to standardise their approach to single event effects in avionics.

General Information

• Status: Replaced
• Publication Date: 07-Mar-2006
• ICS: 03.100.50 - Production. Production management
• ICS: 31.020 - Electronic components in general
• ICS: 49.060 - Aerospace electric equipment and systems
• Technical Committee: TC 107 - Process management for avionics
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 23-May-2012

Relations

• Replaced By: IEC 62396-1:2012 - Process management for avionics - Atmospheric radiation effects - Part 1: Accommodation of atmospheric radiation effects via single event effects within avionics electronic equipment
• Effective Date: 05-Sep-2023

Standards Content (Sample)

TECHNICAL IEC
SPECIFICATION TS 62396-1
First edition
2006-03
Process management for avionics –
Atmospheric radiation effects –
Part 1:
Accommodation of atmospheric radiation effects
via single event effects within avionics electronic
equipment
Reference number
IEC/TS 62396-1:2006(E)
Publication numbering
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TECHNICAL IEC
SPECIFICATION TS 62396-1
First edition
2006-03
Process management for avionics –
Atmospheric radiation effects –
Part 1:
Accommodation of atmospheric radiation effects
via single event effects within avionics electronic
equipment
© IEC 2006 ⎯ Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland
Telephone: [phone] Telefax: [phone] E-mail: [e-mail] Web: www.iec.ch
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– 2 – TS 62396-1 ¤ IEC:2006(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6
1 Scope and object.7
2 Normative references .7
3 Terms and definitions .7
4 Abbreviations used in the document .14
5 Radiation environment of the atmosphere.15
5.1 Radiation generation .15
5.2 Effect of secondary particles on avionics.16
5.3 Atmospheric neutrons.16
5.4 Secondary protons .21
5.5 Other particles.21
5.6 Solar enhancements.22
6 Effects of atmospheric radiation on avionics .22
6.1 Types of radiation effects .22
6.2 Single event effects.23
6.3 Total Ionising Dose (TID) .26
6.4 Displacement damage .27
7 Guidance for system designs.27
7.1 Overview .27
7.2 System design.30
7.3 Hardware considerations .31
7.4 Parts characterisation and control .32
8 Determination of avionics single event effects rates .34
8.1 Main single event effects.34
8.2 Single event effects with lower event rates .34
8.3 Single event effects with higher event rates - Single event upset data.36
8.4 Calculating SEE rates in avionics .42
9 Considerations for SEE compliance.42
9.1 Compliance .42
9.2 Confirm the radiation environment for the avionics application .42
9.3 Identify system development assurance level .42
9.4 Assess preliminary electronic equipment design for SEE.43
9.5 Verify that the system development assurance level requirements are met for
SEE.43
9.6 Corrective actions .43
Annex A (informative) Thermal neutron assessment .44
Annex B (informative) Methods of calculating SEE rates in avionics electronics.45
Annex C (informative) Review of test facility availability.50
Annex D (informative) Tabular description of variation of atmospheric neutron flux
with altitude and latitude .54

TS 62396-1 ¤ IEC:2006(E) – 3 –
Figure 1 – Energy Spectrum of Atmospheric Neutrons at 40 000 Feet (12 160 m),
latitude 45 degrees .17
Figure 2 – Variation of the Atmospheric Neutron Flux with Altitude (see Annex D) .18
Figure 3 – Distribution of vertical rigidity cut offs around the world.19
Figure 4 – Variation of the 1 to 10 MeV atmospheric neutron flux with latitude .20
Figure 5 – Energy Spectrum of Protons within the Atmosphere .21
Figure 6 – System Safety Assessment Process .28
Figure 7 – SEE in relation to System and LRU effect. .30
Figure 8 – Variation of RAM SEU cross section as function of neutron/proton energy .38
Figure 9 – Neutron and proton SEU bit cross-section data .39
Figure 10 – SEU cross section in SRAMs as function of manufacture date.40
Figure 11 – SEU cross section in DRAMs as function of manufacture date .41
Table 1 – Nomenclature Cross Reference.29
Table B.1 – Sources of high energy proton or neutron SEU cross section data .46
Table B.2 – Some Models for the Use of Heavy Ion SEE Data to Calculate Proton
SEE Data.47
Table D.1 – Variation of 1 to 10 MeV neutron flux in the atmosphere with altitude.54
Table D.2 – Variation of 1 to 10 MeV neutron flux in the atmosphere with latitude.54

– 4 – TS 62396-1 ¤ IEC:2006(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PROCESS MANAGEMENT FOR AVIONICS –
ATMOSPHERIC RADIATION EFFECTS –
Part 1: Accommodation of atmospheric radiation effects via
single event effects within avionics electronic equipment
FOREWORD
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• the required support cannot be obtained for the publication of an International Standard,
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• The subject is still under technical development or where, for any other reason, there is
the future but no immediate possibility of an agreement on an International Standard.
Technical specifications are subject to review within three years of publication to decide
whether they can be transformed into International Standards.
IEC 62396-1, which is a technical specification, has been prepared by IEC technical
committee 107: Process management for avionics.

TS 62396-1 ¤ IEC:2006(E) – 5 –
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
107/41/DTS 107/46/RVC
Full information on the voting for the approval of this technical specification can be found in
the report on voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 62396, as currently conceived, consists of the following parts, under the general title
Process management for avionics – Atmospheric radiation effects:
Part 1: Accommodation of atmospheric radiation effects via single event effects within
avionic
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