As aircraft technologies and capabilities evolve and proliferate, more stringent regulations come into play to better ensure that these advanced avionics work dependably and without reference. All HIRF test are performed under full computer control, with flexibility to provide virtually any frequency step size, pulse duty cycle or modulation type. Alion power quality capabilities include single-phase and three-phase AC power and DC power quality testing with transients having fast slew rates. Our equipment also provides the capability for power quality testing in accordance with commercial and military standards, such as:.

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This website uses cookies to improve user experience. By using our website you consent to all cookies in accordance with our Cookie Policy. RTCA DO Environmental Conditions and Test Procedures for Airborne Equipment covers standard procedures and environmental test criteria for testing airborne electronic equipment and mechanical systems.

RTCA DO is used by all major aircraft manufacturers to ensure that electronic systems and components are safe and reliable in any environmental condition. It is applicable for any aircraft, from business jets and helicopters to full-scale airliners. From vibration testing and environmental simulation to EMC testing and direct lightning strike, our laboratories provide RTCA DO testing for virtually every type of aircraft. Using state-of-the-art equipment and parallel test setups, we deliver fast test setups, easier witness testing, and better turnaround times, to help you reduce time to market and minimize test program error.

With experts in active service on RTCA Special Committee , we are constantly on the forefront of evolving standard updates, and can provide support and guidance on even the most challenging technical issues. Sections 4 and 5 of RTCA DO combine an aircraft's cruising altitude with the test unit's onboard position to create equipment categories that set requirements for temperature, altitude, and rates of change for testing.

There are 21 categories associated with temperature and altitude. Temperature testing consists of non-operational ground survival temperatures as low as C and operational high temperatures of 70 C. Altitude testing as high as 70, feet as well as decompression emergency descent and overpressure testing routine aircraft pressurization system testing is also required.

This section covers equipment performance during high and low operating temperature variation. Testing can be performed while the unit is operational or non-operational, or at different points in the operation cycle, demonstrating that the equipment can function under any temperature condition. There are three categories of operational temperature variation A, B, or C and two categories of thermal shock S1 and S2.

S2 is the most severe and is an actual Thermal Shock with as quick a transition from one extreme temperature to the other extreme temperature as possible. RTCA DO humidity testing determines a product's ability to withstand naturally occurring or induced humid atmospheres. We test against corrosion, mechanical failures, electrical malfunction and chemical degradation to ensure that the unit continues to operate safely, no matter its location on the aircraft.

Category A has a high temperature of 50 Deg. C and a duration of two days; Category B has as high temperature of 65 Deg C and a duration of 10 days; and Category C has a high temperature of 55 Deg C and a duration of six days. Operational shock verifies that equipment will continue to function after exposure to shocks experienced during normal aircraft operations. Crash safety shock verifies that equipment will not detach from its mountings during an emergency landing.

Usually combined with Vibration testing, Standard Operational Shock high or low frequency as well as Crash Safety impulse are performed on our electrodynamic shakers. Crash Safety sustained is performed using one of our multiple large centrifuges largest 30 foot arm. This test verifies that equipment can operate or will not be damaged when subjected to vibration levels depending on the installation and location in the aircraft.

We can help with the design and fabrication of your fixture if needed. These take into account the area that the equipment will be on the aircraft possible or expected flammable fluids , fault conditions, or high surface temperatures. A wide variety of remote configurations are available to facilitate the operation of units under test.

High speed photography can also be used to determine point of failure capture flame ignition source. Condensing, Drip, Spray, and Continuous Stream Proof testing are performed on units while operating with tightly controlled unit and water temperatures.

Category Y is for Condensing water on the unit while Category W is for falling drops of water from condensation on the aircraft. This determines whether the materials used in the construction of equipment can withstand the effects of fluids that are representative of those commonly used in airborne and ground operations.

While there is only one Category, F, however there are two different methods: Spray and Immersion. This test determines the resistance of equipment to the effects of blowing sand and dust. Adverse effects include: penetration into cracks, bearings, clogging of moving parts and filters, and formation of electrically conductive bridges.

There is only one Category, F. This test requires 28 days of testing in an environment conducive to rapid fungal growth. Element's experts are highly experienced and spores are kept active which allows us to start a test with minimal notice.

As the inspection can be subjective, magnified photos of any growth are included in our test reports. This test determines whether material used in the construction of equipment can be adversely affected by fungi. This test determines the effects on equipment of prolonged exposure to a salt atmosphere. Salt fog can be a destructive test and will show corrosion, clogging or binding of moving parts, as well as insulation faults.

There are two Categories. S for locations where corrosive atmosphere is encountered during normal aircraft operation and T for locations where severe salt atmosphere is encountered hovering aircraft over sea. There are five equipment Categories Y, Z, A, B, and C that apply to installation separation distances between the EUT and compass or compass sensor of less than 30 centimeters to more than centimeters.

Any method can be used, as long as the pulse produced has a duration of at least 10 microseconds, a rise time of less than 2 microseconds, and a source impedance of 50 ohms. During testing, a minimum of 50 voltage spikes are applied within 1 minute. There are two equipment Categories. The Category A test level is volts. There are three DC power equipment Categories R, B, and Z that indicate the type of power used by the equipment and the type of DC power source with which the equipment is compatible.

Category K designates that the EUT has been tested for use with any type of AC power input, and tested to a higher level of voltage distortion than category R. Tests in this section are performed to determine if the unit and its interconnecting cables can operate as required when exposed to RF interference.

The equipment Categories are comprised of two characters. The first character A, B, C, or Z indicates the tests performed and severity level of the tests.

These tests are performed to determine that equipment will operate as specified when the EUT and its interconnecting cables are exposed to Radio Frequency interference. Equipment Category designation for Section 20 consists of two letters. Conducted susceptibility test levels are designated with the first category character and radiated susceptibility test levels with the second category character. There are 7 Equipment Categories for conducted susceptibility, and 10 Equipment Categories for radiated susceptibility.

This section of RTCA DO ensures that the unit does not emit radiofrequency interference in excess of accepted limits. Testing measures conducted RF and radiated RF appearing on interconnected cables and power leads. There are 6 equipment Categories B, L, M, H, P, and Q that indicate the location of the equipment and the separation between the equipment and aircraft antennas.

In general, the closer the equipment is to an aircraft antenna, and the more it approaches a "direct view" of an aircraft antenna, the tighter the emissions limits. Pin injection is normally used to show damage tolerance, while cable bundle tests are normally used to show upset tolerance. Category designations consist of five characters that describe the pin and cable test Waveform Sets and test levels.

Tests in this section determine the ability of externally mounted electronic equipment to withstand the direct effects of a severe lightning strike. Equipment is not normally operational, and testing usually causes damage to the unit. Category designations consist of four characters that describe the nature and severity of the test waveforms applied.

The first 2 characters designate the High Voltage Strike Attachment test category, and the last two characters designate the High Current Physical Damage test category. The designated test category for the EUT should correspond to the lightning strike zone in which the EUT will be installed on the aircraft.

Icing testing determines a product's ability to withstand naturally occurring ice and frost conditions, and helps evaluate the need for de-icing operations. All sections can be performed at Element, using automated chambers that perform the cycle Category B test that combines altitude, humidity and freezing temperatures.

There are three equipment Categories: A, B, and C. Category A is for equipment located externally or in non-climate controlled areas of the aircraft where Ice and Frost may occur due to condensation.

Category B is a 25 cycle test which mimics the effects of multiple ascents and descents where the accumulation of water can cause structural or functional damage to moving parts and electronic systems. Category C is used for external areas where standing water could freeze and where ice could build up over time impeding normal operation of the test unit. Electrostatic discharge testing per RTCA DO determines if a unit can operate as specified during and after an electrostatic discharge event.

Test points are chosen based on their accessibility to personnel, with 10 positive and 10 negative polarity discharges at 15 kV applied to each one.

This section defines the flammability and fire resistance procedures located in the aircraft engine, as well as electronic enclosures. In addition to the Bunsen burner type testing required by category C, Element has extensive aircraft engine fire simulation capabilities required by categories A and B, as well as smoke and toxicity testing required by certain airframers.

There are three categories, A, B, and C. Categories A and B are intended for equipment located in fire zones engine and uses a large kerosene burner to simulate an aircraft engine fire.

Category C uses a Bunsen burner and is used to check the non-propagation of the flame in cases where ignition would appear inside or outside of the equipment. Typically, this test is performed on materials only. Element has extensive capabilities required by all categories as well as smoke and toxicity required by various airframers.

Engaged in testing virtually every material, component and system on commercial aircraft, Element's deliverable is mission critical, certainty. Element can provide you with critically important data on your product or part's performance in response to typical or extreme environmental stresses and conditions.

Learn more about our laboratories - where they are located; the unique capabilities they have and how they can help you solve your technical and commercial challenges. Read More. Our Services Materials Testing. Product Qualification Testing Certification. Aerospace Product Testing. Contact Us. Section 4. More Less. Equipment Categories There are 21 categories associated with temperature and altitude. Section 5.

Equipment Categories There are three categories of operational temperature variation A, B, or C and two categories of thermal shock S1 and S2. Section 6. More Less Learn more.

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