Posted on November 20, 2018


This paper provides a detailed description of the radio frequency susceptibility requirements in Change Notice One for Section 20 of RTCA/DOD. 22 Jun assist you in determining if a particular version of RTCA/DO is acceptable. Note: When reference to RTCA/DOD is made in this AC, it. 26 Oct 1 RTCA/DO Section 26, Fire, Flammability. Working Group. Environ Laboratories LLC. Alan Thompson, President.

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Equipment installedin locations where it may be subjected to a driving rainor where water may be sprayed on it from any angle is identified as Category R.

Thetest profile is shown graphically in w e The ground survival high temperature test may not be deleted, even if the short-time high temperature is identical to the operating high temperature. The frequencies chosen for the test should be appropriate to the equipment. Nozzle pressure shall be as low as practicable to produce fog at the required rate. Action as nucleus for the collection of water vapor, including secondary effects of possible corrosion. The flammable test fluids, vaporsor gases referredto in this section simulate those normally used in conventional aircraft and that require oxygen for combustion e.

Enterable data, whether manually 16d automatically loaded, shall be entered and all related displays functioning prior to each test condition.

Unless otherwise specified, test levels for 14 Vdc equipment are one half that shown for 28 Vdc equipment. The voltage modulation will be 3.

RTCA DO Testing to DO D, E & F

Categories without the number two 2 contain higher levels and reflectthe expected environment for all cases. It should be recognized that not all possible combinations of temperatures and altitude limits are covered inthese equipment categories.


This information is contained in national documents. Decrease the voltage to 15 V dc k0. Category E l Equipment intended for installation in non-pressurized and non-controlled temperature locations on an aircraft that is operated at altitudes up to 70, ft 21,m MSL is identified as Category El. Allow 15 minutes maximum rtac the application of primary power for the equipment to warm up.

Severe Humidity Environment Test At the end of 24 hours, operatethe equipment for at least 10 minutes.

The use of a fume hood as suggestedabove,however,is considered an adequate precautionwhen performing this test. Apply each voltage surge three times at ten-second rtcz. This bandwidth settingshall then be usedfor the test. When the length of an interconnecting cable bundle is greater than the test bench, the cable bundle should be arranged with the excess length zig-zaggedat the back of the test bench approximately 50 mm above the ground plane.

This is only likelyto happen afterthe specimen hasdried out. Certain equipment must survive for a limited time in the absence of cooling.

Any inputs or outputs to or from other equipment s rtc the equipment s under test shall be connectedor adequately simulated. After the three-hour test, repeat the test of subparagraph 8.


Requirement With the equipment operatingat its design voltage s and nominal frequency, apply to each ofthe primary input leads, voltage surges of rms V for ms and V rms for one second.

In this figure the use of English units was retained because the graphs were derived from these units originally. Definition This requirement applies to category 2 and 28 volt category B equipments.

Equipment Not Operating tlmo Hour. Each of these two methods are at the discretion of the applicant. The exception to this limitation is where cable bundle fo are matched or specified to a particular length for phase matchor similar reasons.

Critical frequencies are defined as those frequencies where: If the impedance of the test power leads is such that excessive power will be required to generate the specified audio signal voltage level, the test conditions will be adequately satisfied by the use of audio an amplifier with a maximum output of 30 W.


Apply factor to obtain mass of fuel corrected Wf.

The procedure shall bein accordance with the following steps: The occurrence of an explosion within the case may use of a thermocouple inserted in the case and connected to a sensitive galvanometer outside the test chamber. This category may also be applicable to equipment installed ina temperature controlled but unpressurized locations on an aircraft that operates at altitudes no higher than 15,ft.

This test determines whether the equipment interconnect 160c configuration will accept a level of dk voltages caused by the installation environment. The “fuselage” zoneapplies to all equipment not installed in multiple slot equipment racks but that is attached to frames, stringers, skin and other fuselage structure or brackets.

Voltage Modulation ac a. The random and sinusoidal standard and robust test levels may be reduced by 0. Apply the endurancelevel test APSD for three hours. Unless so stated in the equipment performance standard, equipment may have degraded performanceduring the surge and must meet the specified performance when returned to nominal voltage and frequency. If the transmitting antenna being used is a pyramidal horn, such as a standard gain horn or similar type radiator,as the dimensions ofthe antenna become small and the frequency to of interest becomes higher, is it permissible to move the antenna closer to the EUT thanthe one ddo shownin Figure Waveform The waveform vo have a crest factor 1.