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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Amplitude measurements shall be madein a mannerwhich clearly establishes the peak amplitude of the modulated waveform. Nozzle pressure shall be as low as practicable to produce fog dk the required rate. Subject to the provisions of Subsection 3. Change the temperature of the chambertowards the ambient temperature at the applicable rates specified in Subsection 5.
Unless rrca specified in the applicable performance standard, the exclusion band may include frequencies up to 20 percent above the highest transmitheceive frequency and frequencies within20 percent of the lowest transmitheceive frequency.
The characteristics of instrumentation used to demonstrate compliance and the shock pulse tolerance limits are rca in Figures andrespectively. Test conditions and procedures for equipment using other electrical power must be defined in applicable equipment performance standards.
RTCA DO Testing to DO D, E & F
In atypical case, the repetition period is 0. The required quantity offuel paragraph 9. Circulate the test atmosphere for at least three minutes to allow for complete vaporization of fuel andthe development of a homogenous mixture. These tests exercise the assemblies capability of surviving extreme temperature changes and the effects of differing coefficients of thermal expansion.
Equipment location, anticipated exposure and location of interconnecting wiring, aircraft size and constructiondetermine 1600d test level. The salt solution from allcollection receptacles used can be combined to provide the quantity required for the measurements specified.
For all other zones, the sine-on-random test must beapplied.
If inspection reveals that the environmental conditionsare unsuitable for growth, the entire test shallbe repeated. Equipment that may come into contact with flammable fluids or vapors, and that under fault conditions may produce arcs, electrical sparks, friction sparks or hot surfacesshall be designed and installed to reduce to an acceptable minimum the overall risk of fault a occurring that will ignite the flammable vapors.
The watershall be directed perpendicular to the most vulnerable area s of the equipment as stated in the applicable equipment performance standards. Any method of generating the spike may be used if dtca waveform complies with Figure Further, Appendix is A applicable for identifying the environmental tests performed.
At the end ofthe exposure period, remove the equipment from the test chamber and drainoff do not wipe any condensed moisture. Changes in the measuredperformanceorvibrationresonancesshallbenotedon the Environmental Qualification Form see Appendix A.
The LISN case shall be bonded to the ground plane. The equipment shall be attached to the fixture or vibration table by the meansspecifiedin the equipmentspecification.
The test profile is rca graphically inFieure M. A means for humidifying the air at temperatures above the chamber temperature. Test requirements for this type of equipment shall be specified in the equipment performance specification.
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Apply each voltage surge three times at ten-second intervals. For test equipment that generate discrete frequencies, the minimum number of test frequencies shall be frequencies per decade. InMET broke the UL monopoly for product safety testing and certification in the United States and is approved to certify products in over UL standard categories. Ambient Conditions Unless otherwise specified, all tests shall bemade conditions: ElectricFieldEnvironment volts rms x meters Note 3: Maintain the chamber temperature at 65 degrees Celsius with the relative humidity at least 95 percent for six hours minimum.
If this is a combined test, proceed in accordance with paragraph 4. The decompression test is intended for equipment as follows: In addition, all parts that come in contact with test items shall be made of materials that will not cause electrolytic corrosion. Test Freauencv Exclusions RF susceptibility tests on intentional RF transmitting or receiving equipment may exclude the transmitheceive frequency band for that equipment.
Apply a minimum of 50 transients of each polarity withina period of one minute. With the rca in theapplicable equipment specification, applythe appropriate endurance level test curve of Table for 160s hours. Critical frequencies are defined as those frequencies where: Stabilize the equipment at the operating high temperature.
Requirement Compliance with subsequentrequirements in this section infers compliance under these standard conditions. If the equipment andits ducting, includingjoints, are in an area that can be so contaminated, they shall be capable of meeting the conditions appropriate to the environment.
Swept frequency analysis systems characterized as follows: Surgical gloves may be wornto protect the hands, andcare should betaken not to splash the rta on other areas of the skin or on clothes. If the surfaces are nonwetting, spray until initiation of droplet coalescence.
Increase the voltage to V rms i2 V rms for 30 ms. Category B – For equipment in a non-temperature-controlled or partially temperature controlled internal section ofthe aircraft: Xtho Explosion Proofness Important Notice Information pertinentto this test procedure is contained in D 1,2and 3.
After the three-hour test, repeat the test of subparagraph 8.