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EMI/EMC Requirements

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EMI/EMC Requirements for Part 23/25 Airplanes Jean Cartier Avionics Workshop TCCA Aircraft Certification November 27, 2003 AEA 03-03 Item EMI/EMC Testing of Avionics ... – PowerPoint PPT presentation

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Title: EMI/EMC Requirements


1
  • EMI/EMC Requirements
  • for
  • Part 23/25 Airplanes
  • Jean Cartier
  • Avionics Workshop
  • TCCA Aircraft Certification
  • November 27, 2003

2
AEA 03-03 Item
  • EMI/EMC Testing
  • of
  • Avionics Modifications

3
Statement of Issue
  • AEA recommends TCCA to provide guidance material
    to ensure EMI/EMC testing of avionics
    installations are conducted in a manner
    appropriate to the type and criticality of
    equipment being installed and its potential
    effects on the aircraft

4
AEA Issues
  • Level of EMC Testing for Non-required Equipment
    Installations
  • DO-160D Section 20/21 Test Category/Data for
    Criticality of Equipment and Functions
  • Compliance to HIRF Certification Standards
  • Requirements for EMC Test Plans
  • Acceptability of Equipment Test Data VS
    Installation Test Data

5
23.1431(b) Electronic Equipment
  • (b) Radio and electronic equipment, controls, and
    wiring must be installed so that operation of any
    unit or system of units will not adversely affect
    the simultaneous operation of any other radio or
    electronic unit, or system of units, required by
    this chapter.
  • 23.1431(b) parallels the requirement of
    23.1309(a)
  • The intent of 23.1431(b) is exactly the same as
    25.1431(c) Issued 11/03/64 CAR 4b.650,
    31/12/53

6
Level of EMC Testing for NRE Installations
  • General guidelines for EMC are provided in AC
    25-10 Guidance for Installation of
    Miscellaneous, Non-required Electrical Equipment
  • MIL-STD 464 Electromagnetic Environmental
    Effects Requirements for Systems
  • AC 43.13-1B Guidance for Installation of
    Miscellaneous, Non-required Electrical Equipment
    Chapter 11, Paragraphs 106/107

7
Level of EMC Testing for NRE Installations
(Contd)
  • The following factors should be addressed as part
    of the EMC requirements
  • Verify by inspection that the installed
    equipment/system conforms to the specified
    installation drawings
  • Development of the source/victim operational
    check matrix should consider potential EMI
    conditions between transmission and harmonic
    frequencies of required equipment such as radios
    and navigation systems, Etc
  • All reasonable combinations of control settings
    and operating modes should be assessed
  • Communications and navigation equipment should be
    operated on low, mid-band, and high frequencies

8
Level of EMC Testing for NRE Installations
(Contd)
  • The following factors should be addressed as part
    of the EMC requirements (Contd)
  • All electrically operated equipment and systems
    must be fully functional
  • In-Flight EMC testing should be assessed to
    validate flight operated functions which cannot
    be assessed on-ground
  • On-Ground EMC testing should be conducted with
    the equipment powered by the airplaness
    electrical generating system

9
Level of EMC Testing for NRE Installations
(Contd)
  • The following factors identify installation
    design considerations which may directly
    contribute to the quality of EMC between
    non-required and required A/C systems
  • Equipment location and installation
  • ?Harness routing
  • ?Shielding integrity
  • ?Wiring segregation
  • ?Potential ground loops
  • ?Inter-channel communication interference
  • ?Antenna Radiation

10
Level of EMC Testing for NRE Installations
(Contd)
  • The source/victim testing level for non-required
    equipment is the same as for required
    equipment. However, our concern is much less for
    the functionality of non-required equipment

11
DO-160D Section 20 Test Category/Data for
Criticality of Equipment and Functions
  • RF Susceptibility (Radiated Conducted)
  • The purpose of section 20 is to determine that
    the equipment functions will not be adversely
    affected when the equipment and its
    interconnecting wiring are exposed to specified
    HIRF levels
  • The declared equipment test category level should
    comply with the HIRFs Special Condition (SC)
    requirements
  • Applicable to systems which perform critical
    functions

12
DO-160D Section 21 Test Category/Data for
Criticality of Equipment and Functions
  • Emission of RF Energy (Radiated Conducted)
  • The purpose of section 21 is to determine that
    the equipment does not emit undesired RF noise in
    excess of the specified test category level.
  • DO-160D section 21 provides guidance for
    selecting appropriate category levels
  • The test category levels are declared by the
    equipment manufacturer

13
DO-160D Section 21 Test Category/Data for
Criticality of Equipment and Functions (Co
ntd)
  • DO-160 provides guidance to assist the
    manufacture in selecting the appropriate test
    category. However, it is the responsibility of
    the installer to resolve any incompatibilities
    between the new installation and previously
    installed equipment

14
Compliance to HIRF Certification Standards
  • The following are applicable guidance/advisory
    material
  • FAA Notice N8110.71 Guidance for the
    Certification of Aircraft Operating in HIRF
    Environments 4/2/98
  • AC/AMJ 20-1317 The Certification of Aircraft
    Electrical and Electronic Systems for Operation
    in the HIRF Environment Final Draft March
    1999
  • Users Guide for AC/AMJ 20-1317 The Certification
    of Aircraft Electrical and Electronic Systems
  • SAE ARP5583 Guide to Certification of Aircraft
    in a HIRF Environment January 2003
  • DO-160D Section 20 RF Susceptibility (Radiated
    and Conducted)
  • 14/12/00 Change No. 1

15
Compliance to HIRF Certification
Standards (Contd)
  • The requirement for certification to HIRF is
    addressed by a Special Condition (SC), and is
    applicable to systems which perform critical
    (Level A) functions
  • Compliance to the HIRF SC requires that the
    applicant submit the following
  • Compliance Plan outlining the method of
    compliance to HIRF
  • Aircraft Hazard/Safety Analysis (FHA) and a
    HIRF/Lightning Criticality Assessment to
    substantiate the systems/equipment criticality
    levels and test data

16
Compliance to HIRF Certification
Standards (Contd)
  • The FAA/TCCA HIRF SC requirements are applicable
    only to systems which perform critical functions
    (Level A)
  • The JAA HIRF SC requirements are applicable to
    systems which performs critical and essential
    functions (Levels A,B,C)

17
Compliance to HIRF Certification Standards
(Contd)
  • Also applicable to the HIRF SC is the requirement
    to provide Instructions for Continued
    Airworthiness (ICAW) in accordance with the
    requirement of 23/25.1529.
  • The ICAW should include all necessary maintenance
    actions to assure that the continued integrity of
    structural shielding, wire shields, connectors,
    and equipment protection components are maintained

18
Need for EMC Test Plans
  • An EMC test plan is required to document
  • The source/victim functional test
    matrix (Evaluation of all potential system
    victims must be assessed)
  • The equipment/system installation conformity (A/C
    equipment/system configuration must be
    representative model and part number of the
    installed equipment should be identified)
  • The Pass/Fail criteria (as applicable)
  • All reasonable combinations of control settings
    and operating modes (All foreseeable EMC worst
    case conditions should be considered)

19
Need for EMC Test Plans (Contd)
  • An EMC test plan is required to document
    (Contd)
  • Communication and navigation equipment operating
    frequencies
  • On-ground and In-flight test configurations
  • The test plan should provide adequate detail to
    assure repeatability

20
Acceptability of Equipment Test Data VS
Installation Test Data
  • DO-160 Section 20 equipment test data would be
    acceptable providing that the test category
    levels comply with the HIRF SC requirements
    (Category W 100V/M - 150mA)
  • DO-160 Section 21 equipment test data would not
    be sufficient (section 21 qualification test data
    provides some degree of confidence to the
    installer that the equipment will be compatible
    with installed systems) However, EMC A/C
    installation test data would be required to
    demonstrate compliance to 23/25.1431

21
Conclusion
  • ?All new installations must address the
    requirements of 23.1431(b)/25.1431(c)
  • ?Recommended guidance material is provided in AC
    25-10, MIL-STD 464, AC 43.13-1B, and the HIRF
    users guide
  • ?TCCA intends to address EMI/EMC concerns at the
    internal TCCA workshop
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