Part V - Airworthiness Manual Chapter 525 - Transport Category Aeroplanes

Canadian Aviation Regulations (CARs) 2014-1

Content last revised: 2008/12/30

Preamble

SUBCHAPTERS 

  • A (525.1-525.2), 
  • B (525.21-525.255), 
  • C (525.301-525.581), 
  • D (525.601-525.899), 
  • E (525.901-525.1207), 
  • F (525.1301-525.1461), 
  • G (525.1501-525.1587)
  • H (525.1701-525.1733)

APPENDICES 

A, B, C, D, E, F, G, H, I, J, L, M, N

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

APPENDIX L

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

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 under 525.1317. The field strength values for the HIRF environments and equipment HIRF test levels are expressed in root-mean-square units measured during the peak of the modulation cycle.
(amended 2008/10/30; no previous version)

(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)

(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)

(c) Equipment HIRF Test Level 1
(amended 2008/10/30; no previous version)

(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 decibels (dB) per frequency decade to a minimum of 30 mA at 500 kHz.
(amended 2008/10/30; no previous version)

(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) 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) 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) 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)

(d) 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)

(e) Equipment HIRF Test Level 3
(amended 2008/10/30; no previous version)

(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) 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) 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) From 100 MHz to 8 GHz, use radiated susceptibility tests at a minimum of 5 V/m.
(amended 2008/10/30; no previous version)