Airworthiness Manual Chapter 529 Appendix E - HIRF Environments and Equipment HIRF Test Levels - Canadian Aviation Regulations (CARs)

Canadian Aviation Regulations (CARs) 2019-1

Content last revised: 2003/12/01

Preamble

SUBCHAPTERS

• A (529.1-529.20),
• B (529.21-529.300),
• C (529.301-529.600),
• D (529.601-529.900),
• E (529.901-529.1300),
• F (529.1301-529.1500),
• G (529.1501-529.1589)

APPENDICES 

A,  B,  C,  D,  E

Appendix E
HIRF Environments and Equipment HIRF Test Levels

(amended 2008/10/30; no previous version)

This appendix specifies the HIRF environments and equipment HIRF test levels for electrical and electronic systems in accordance with 529.1317. The field strength values for the HIRF environments and laboratory equipment HIRF test levels are expressed in root-mean- square units (RMS) measured during the peak of the modulation cycle.
(amended 2008/10/30; no previous version)

1. (a) HIRF environment I is specified in the following table:
   (amended 2008/10/30; no previous version)

   Table I — HIRF Environment I

   Frequency	Field Strength (Volts/Meter)
   	Peak	Average
   10 kHz – 2 MHz	50	50
   2 MHz – 30 MHz	100	100
   30 MHz – 100 MHz	50	50
   100 MHz – 400 MHz	100	100
   400 MHz – 700 MHz	700	50
   700 MHz – 1 GHz	700	100
   1 GHz – 2 GHz	2000	200
   2 GHz – 6 GHz	3000	200
   6 GHz – 8 GHz	1000	200
   8 GHz – 12 GHz	3000	300
   12 GHz – 18 GHz	2000	200
   18 GHz – 40 GHz	600	200

In this table, the higher field strength applies at the frequency band edges
(amended 2008/10/30; no previous version) 

1. (b) HIRF environment II is specified in the following table:
   (amended 2008/10/30; no previous version)

   Table II — HIRF Environment II

   Frequency	Field Strength (Volts/Meter)
   	Peak	Average
   10 kHz – 500 kHz	20	20
   500 kHz – 2 MHz	30	30
   2 MHz – 30 MHz	100	100
   30 MHz – 100 MHz	10	10
   100 MHz – 200 MHz	30	10
   200 MHz – 400 MHz	10	10
   400 MHz – 1 GHz	700	40
   1 GHz – 2 GHz	1300	160
   2 GHz – 4 GHz	3000	120
   4 GHz – 6 GHz	3000	160
   6 GHz – 8 GHz	400	170
   8 GHz – 12 GHz	1230	230
   12 GHz – 18 GHz	730	190
   18 GHz – 40 GHz	600	150

In this table, the higher field strength applies at the frequency band edges
(amended 2008/10/30; no previous version) 

1. (c) HIRF environment III is specified in the following table:
   (amended 2008/10/30; no previous version)

   Table III — HIRF Environment III

   Frequency	Field Strength (Volts/Meter)
   	Peak	Average
   10 kHz – 100 kHz	150	150
   100 kHz – 400 MHz	200	200
   400 MHz – 700 MHz	730	200
   700 MHz – 1 GHz	1400	240
   1 GHz – 2 GHz	5000	250
   2 GHz – 4 GHz	6000	490
   4 GHz – 6 GHz	7200	400
   6 GHz – 8 GHz	1100	170
   8 GHz – 12 GHz	5000	330
   12 GHz – 18 GHz	2000	330
   18 GHz – 40 GHz	1000	420

In this table, the higher field strength applies at the frequency band edges
(amended 2008/10/30; no previous version) 

1. d) Equipment HIRF Test Level 1
   (amended 2008/10/30; no previous version)
   1. (1) From 10 kilohertz (kHz) to 400 megahertz (MHz), use conducted susceptibility tests with continuous wave (CW) and 1 kHz square wave modulation with 90 percent depth or greater. The conducted susceptibility current shall start at a minimum of 0.6 milliamperes (mA) at 10 kHz, increasing 20 decibel (dB) per frequency decade to a minimum of 30 mA at 500 kHz.
      (amended 2008/10/30; no previous version)
   2. (2) From 500 kHz to 40 MHz, the conducted susceptibility current shall be at least 30 mA.
      (amended 2008/10/30; no previous version)
   3. (3) From 40 MHz to 400 MHz, use conducted susceptibility tests, starting at a minimum of 30 mA at 40 MHz, decreasing 20 dB per frequency decade to a minimum of 3 mA at 400 MHz.
      (amended 2008/10/30; no previous version)
   4. (4) From 100 MHz to 400 MHz, use radiated susceptibility tests at a minimum of 20 volts per meter (V/m) peak with CW and 1 kHz square wave modulation with 90 percent depth or greater.
      (amended 2008/10/30; no previous version)
   5. (5) From 400 MHz to 8 gigahertz (GHz), use radiated susceptibility tests at a minimum of 150 V/m peak with pulse modulation of 4 percent duty cycle with a 1 kHz pulse repetition frequency. This signal shall be switched on and off at a rate of 1 Hz with a duty cycle of 50 percent.
      (amended 2008/10/30; no previous version)
2. (e) Equipment HIRF Test Level 2
   (amended 2008/10/30; no previous version)
   
   Equipment HIRF test level 2 is HIRF environment II in table II of this appendix reduced by acceptable aircraft transfer function and attenuation curves. Testing shall cover the frequency band of 10 kHz to 8 GHz.
   (amended 2008/10/30; no previous version)
3. (f) Equipment HIRF Test Level 3
   (amended 2008/10/30; no previous version)
   1. (1) From 10 kHz to 400 MHz, use conducted susceptibility tests, starting at a minimum of 0.15 mA at 10 kHz, increasing 20 dB per frequency decade to a minimum of 7.5 mA at 500 kHz.
      (amended 2008/10/30; no previous version)
   2. (2) From 500 kHz to 40 MHz, use conducted susceptibility tests at a minimum of 7.5 mA.
      (amended 2008/10/30; no previous version)
   3. (3) From 40 MHz to 400 MHz, use conducted susceptibility tests, starting at a minimum of 7.5 mA at 40 MHz, decreasing 20 dB per frequency decade to a minimum of 0.75 mA at 400 MHz.
      (amended 2008/10/30; no previous version)
   4. (4) From 100 MHz to 8 GHz, use radiated susceptibility tests at a minimum of 5 V/m.
      (amended 2008/10/30; no previous version)