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Aerospace Standard AEROSPACE AS5498 STANDARD Issued 2001-10 400 Commonwealth Drive, Warrendale, PA 15096-0001 Minimum Operational Performance Specification for Inflight Icing Detection Systems FOREWORD 1. The development of these guidelines was jointly accomplished by EUROCAE Working Group 54 and the Society of Automotive Engineers (SAE) AC-9C through a consensus process. It was accepted by the Council of EUROCAE on June 2001 and SAE on September 2001. 2. SAE, Inc. and EUROCAE are, respectively, US and international not-for-profit making organizations, formed to advance the art and science of aviation and aviation electronic systems for the benefit of the public. 3. Since SAE or EUROCAE are not official agencies of any US or European government, their recommendations may not be regarded as statements of official government policy unless so enunciated by the appropriate government organization, conference of governments, or agency having statutory jurisdiction over any matters to which the recommendations relate. SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright 2001 Society of Automotive Engineers, Inc. All rights reserved. Printed in U.S.A. TO PLACE A DOCUMENT ORDER: (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS: http://www.sae.org SAE AS5498 TABLE OF CONTENTS CHAPTER 1 1. SCOPE ...............................................................................................................................................5 1.1 Purpose and Scope ...................................................................................................................5 1.2 Applications................................................................................................................................5 1.3 Functionality and Description of System....................................................................................6 1.4 System Classification.................................................................................................................7 1.4.1 Classification By Use .................................................................................................................7 1.4.2 Classification By Sensing Method..............................................................................................7 1.5 Definitions and Abbreviations.....................................................................................................8 1.6 References...............................................................................................................................11 1.6.1 Reference Documents .............................................................................................................11 1.6.2 Applicable Documents .............................................................................................................11 CHAPTER 2 2. GENERAL DESIGN REQUIREMENTS ............................................................................................13 2.1 Design Requirements...............................................................................................................13 2.1.1 Airworthiness And Certification ................................................................................................13 2.1.2 Controls....................................................................................................................................13 2.1.3 Effects Of Tests ........................................................................................................................13 2.1.4 Software Management.............................................................................................................13 2.1.5 Operational Minimum Requirements........................................................................................13 2.1.6 Minimum Structural Considerations .........................................................................................14 2.1.7 Additional Design Criteria.........................................................................................................14 2.2 Reporting Requirements ..........................................................................................................15 2.2.1 Summary Report......................................................................................................................16 2.2.2 Substantiating Test Data/Analysis............................................................................................16 2.3 Other Requirements.................................................................................................................17 2.3.1 Qualification Testing Responsibility..........................................................................................17 2.3.2 Test Samples ...........................................................................................................................17 CHAPTER 3 3. MINIMUM OPERATIONAL PERFORMANCE SPECIFICATION UNDER STANDARD CONDITIONS ...................................................................................................................................18 3.1 Overview ..................................................................................................................................18 3.2 Functional Minimum Requirements..........................................................................................18 3.2.1 FIDS That Detect Ice Accretion................................................................................................18 3.2.2 FIDS That Detect Icing Conditions...........................................................................................19 - 2 - SAE AS5498 TABLE OF CONTENTS (Continued) CHAPTER 4 4. MINIMUM PERFORMANCE SPECIFICATION UNDER ENVIRONMENTAL CONDITIONS ...........20 4.1 Introduction ..............................................................................................................................20 4.2 Testing......................................................................................................................................20 4.3 Fluids Susceptibility (EUROCAE ED-14D/RTCA DO-160D, Section 11).................................20 4.3.1 Test Applicability ......................................................................................................................20 4.3.2 Fluids To Be Tested..................................................................................................................23 4.4 Hail Strike.................................................................................................................................23 CHAPTER 5 5. TEST PROCEDURES ......................................................................................................................24 5.1 General ....................................................................................................................................24 5.1.1 Reports & Declarations ............................................................................................................24 5.1.2 Power Input Voltage.................................................................................................................24 5.1.3 Power Input Frequency............................................................................................................24 5.1.4 Adjustment of Frequency .........................................................................................................24 5.1.5 Test Instrument Precautions.....................................................................................................24 5.1.6 Ambient Conditions..................................................................................................................24 5.1.7 Connected Loads.....................................................................................................................24 5.1.8 Warm-up Period .......................................................................................................................24 5.1.9 Test Procedures .......................................................................................................................25 5.2 Detailed Test Procedures.........................................................................................................25 5.2.1 FIDS That Detect Ice Accretion................................................................................................25 5.2.2 FIDS That Detect Icing Conditions...........................................................................................29 CHAPTER 6 6. GUIDANCE FOR INSTALLED EQUIPMENT PERFORMANCE.......................................................30 6.1 Introduction ..............................................................................................................................30 6.2 General Conditions ..................................................................................................................30 6.2.1 Accessibility .............................................................................................................................30
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