AS50881 PDF

Find the most up-to-date version of SAE AS at Engineering MIL-WL, MILITARY SPECIFICATION: WIRING AEROSPACE VEHICLE (10 MAY ) [S/S BY SAE-AS]., This specification covers all aspects from. Title: SAE-AS ADOPTION NOTICE, Date: Sep, Status: Active, Desc: WIRING AEROSPACE VEHICLE (SEP) [SUPERSEDING.

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Within many of the standards groups, efforts are being made to develop test methods and quantify the long-term impact. This accelerated aging should be structured to be a more severe representation of the in-service conditions. Each aircraft has a specified service life and the installed equipment must either be identified as a as50818 limited part or last the entire service life.

Testing for AS | Lectromec

For several decades now, the AS formerly the MIL-STD has been a fundamental knowledge base used for the installation of aircraft wiring systems. To get sa50881 EWIS certification, there are some areas of the AS that require data supporting part selection and engineering decisions.

So what does this mean for testing? For commercial zs50881, this may be done as part of the overall certification package. For those in need of laboratory testing to generate data for AS compliance, contact Lectromec.

This is necessary because the long-term exposure of higher voltages to EWIS components has not been thoroughly examined and must be assessed. Often the electrical power source grounds are connected to the primary structure, but this can be difficult in composite structures or alternative structure designs.

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Qualification of Parts All parts that go on an aircraft must be qualified. In particular, these requirements set the maximum permitted energy before activation of circuit protection in any electrical arc scenario. Consideration should be given for which zones the adhesive will be placed; it would not be wise to place an adhesive bond in moisture or fuel exposed zones if no verification had been performed.

There are more requirements that exist on the designer and maintainer than are defined here, but this should provide a starting as50818 for understanding the standard. View Latest Blog Entries Close. Additionally, the design must be verified to show compliance. Michael has been involved in wire degradation and failure assessments for more than a decade.

The requirements laid out in this standard cover the electrical wiring interconnection system EWIS design and recommendations on the selection of qualified parts.

Circuits and circuit protections must be evaluated that electrical sparks and electrical arcs are below this energy. For the military, this may be part of design acceptance.

Michael Traskos President, Lectromec michael. To determine the long-term reliability, accelerated aging may be necessary to show reliable performance data through the expected life of each component.

The AS Section 3. Therefore, for electrical or electronic systems that introduce electrical energy into fuel tanks, such as fuel quantity indicating systems, any electrical arcs or sparks that are created into any fuel tank should be less than microjoules during either sa50881 operation or operation with failures. The parts that are used in the Ax50881 see what is included in the EWISmust meet or exceed the existing standards for comparable equipment with the goal to not use non-compliance parts.

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This may include contact as58081 or bonding measurements. All parts that go on an aircraft must be qualified. To circumvent the process or to accept parts from untrusted third parties can have significant long-term impacts on aircraft reliability. The configurations of electrical ground returns play an important role in the reliability of circuits. The method by which this physical protection is achieved, either through separation, segregation, or circuit protection, the implemented method for protection must be verified.

As508881 has written on this topic:. AS specifies that epoxy adhesives are acceptable for use if they can be proven to be fully functional at maximum rated temperatures. The specific requirements for this will vary depending on the certifying authority, but the basis may be simplified as an EWIS failure, regardless or probability should not impact the aircraft airworthiness. Some of the lessons learned apply to the design level and some place a need for performance verification that requires testing and assessment.



It depends on the location within the aircraft. He has worked on dozens of projects assessing the reliability and qualification of EWIS components.

These tests may be done as focused tests or as part of DO testing.

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