Pt. 29, App. E

14 CFR Ch. I (1-1-19 Edition)
TABLE III. - HIRF ENVIRONMENT III

APPENDIX E TO PART 29 - HIRF ENVIRONMENTS AND EQUIPMENT HIRF
TEST LEVELS
This appendix specifies the HIRF environments and equipment HIRF test levels for
electrical and electronic systems under
Section 29.1317. The field strength values for the
HIRF environments and laboratory equipment HIRF test levels are expressed in rootmean-square units measured during the peak
of the modulation cycle.
(a) HIRF environment I is specified in the
following table:

TABLE I. - HIRF ENVIRONMENT I

Peak
10 kHz-2 MHz ...................................
2 MHz-30 MHz .................................
30 MHz-100 MHz .............................
100 MHz-400 MHz ...........................
400 MHz-700 MHz ...........................
700 MHz-1 GHz ................................
1 GHz-2 GHz ....................................
2 GHz-6 GHz ....................................
6 GHz-8 GHz ....................................
8 GHz-12 GHz ..................................
12 GHz-18 GHz ................................
18 GHz-40 GHz ................................

Average

50
100
50
100
700
700
2,000
3,000
1,000
3,000
2,000
600

50
100
50
100
50
100
200
200
200
300
200
200

In this table, the higher field strength applies at the frequency band edges.

(b) HIRF environment II is specified in the
following table:

TABLE II. - HIRF ENVIRONMENT II
Field strength
(volts/meter)

Frequency

Peak
10 kHz-500 kHz ................................
500 kHz-2 MHz .................................
2 MHz-30 MHz .................................
30 MHz-100 MHz .............................
100 MHz-200 MHz ...........................
200 MHz-400 MHz ...........................
400 MHz-1 GHz ................................
1 GHz-2 GHz ....................................
2 GHz-4 GHz ....................................
4 GHz-6 GHz ....................................
6 GHz-8 GHz ....................................
8 GHz-12 GHz ..................................
12 GHz-18 GHz ................................
18 GHz-40 GHz ................................

20
30
100
10
30
10
700
1,300
3,000
3,000
400
1,230
730
600

Average
20
30
100
10
10
10
40
160
120
160
170
230
190
150

In this table, the higher field strength applies at the frequency band edges.
spaschal on DSK3GDR082PROD with CFR

Field strength
(volts/meter)
Peak

10 kHz-100 kHz ................................
100 kHz-400 MHz .............................
400 MHz-700 MHz ...........................
700 MHz-1 GHz ................................
1 GHz-2 GHz ....................................
2 GHz-4 GHz ....................................
4 GHz-6 GHz ....................................
6 GHz-8 GHz ....................................
8 GHz-12 GHz ..................................
12 GHz-18 GHz ................................
18 GHz-40 GHz ................................

150
200
730
1,400
5,000
6,000
7,200
1,100
5,000
2,000
1,000

(c) HIRF environment III is specified in the
following table:

12:50 Apr 30, 2019

Jkt 247046

PO 00000

Frm 00700

150
200
200
240
250
490
400
170
330
330
420

(d) Equipment HIRF Test Level 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 must 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.
(2) From 500 kHz to 40 MHz, the conducted
susceptibility current must be at least 30
mA.
(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.
(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.
(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 must be switched
on and off at a rate of 1 Hz with a duty cycle
of 50 percent.
(e) Equipment HIRF Test Level 2. 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 must cover the frequency band of 10 kHz to 8 GHz.
(f) Equipment HIRF Test Level 3. (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.
(2) From 500 kHz to 40 MHz, use conducted
susceptibility tests at a minimum of 7.5 mA.
(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.

690

VerDate Sep<11>2014

Average

In this table, the higher field strength applies at the frequency band edges.

Field strength
(volts/meter)

Frequency

Frequency

Fmt 8010

Sfmt 8002

Y:\SGML\247046.XXX

247046