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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To get to EWIS certification, there are some areas of the AS that require data supporting part selection and engineering decisions.
Each aircraft has a specified service life and the installed equipment must either be identified as a life limited part or last the entire service life.
So what does this mean for testing? All parts that go on an aircraft must be qualified. Ws50881 requirements laid out in this standard cover the electrical wiring interconnection system EWIS design and recommendations on the selection of qualified parts. The method by which this physical protection is achieved, either through separation, segregation, or circuit protection, the implemented method for protection must as5081 verified.
The parts that are used in the EWIS see what is included in the EWISmust meet or exceed the existing standards for comparable equipment with the ass50881 to not use non-compliance parts. Circuits and circuit protections must be evaluated that electrical sparks and electrical arcs are below this energy.
In particular, these requirements set the maximum permitted energy before activation of circuit protection in any electrical arc scenario. Often the electrical power source grounds are connected to the primary structure, but this can be difficult in composite structures or alternative structure designs.
Testing for AS50881
Lectromec has written on this topic:. Qualification as5881 Parts All parts that go on an aircraft must be qualified. 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.
SAE-AS ADOPTION NOTICE WIRING AEROSPACE VEHICLE
To circumvent the process or as508881 accept parts from untrusted third parties can have significant long-term impacts on aircraft reliability. AS specifies that epoxy adhesives are acceptable for use if they can be proven to be fully functional at maximum rated temperatures. There are more requirements that exist on the designer and maintainer than are defined here, but this should provide a starting point for understanding the standard.
Additionally, the design must be verified to show compliance. This accelerated aging should be structured to be a more severe representation of the in-service conditions. For the military, this as508881 be part of design acceptance.
Testing for AS | Lectromec
Michael Traskos President, Lectromec michael. View Latest Blog Entries Close. These tests may be done as focused tests or as part of DO testing. For several decades now, the AS formerly aa50881 MIL-STD has been a fundamental knowledge base used for the installation of aircraft wiring systems. The configurations of electrical ground returns play an important role in the reliability of circuits. This is necessary because the long-term exposure as50818 higher voltages to EWIS components as50881 not been thoroughly examined and must be assessed.
This may include contact resistance or bonding measurements. 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 normal operation or operation with failures.
It depends on the location within the aircraft. For those in need of laboratory testing to generate data for AS compliance, contact Lectromec.
For commercial aircraft, this as0881 be done as part of the overall certification package. 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.
The specific requirements ws50881 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.
Within many of the standards groups, efforts are being made to develop test methods and quantify the long-term impact.
He has worked on dozens of projects assessing the reliability and qualification of EWIS components. Some of the lessons learned apply to the design level and some place a need for performance verification that requires testing and assessment. Michael has been involved in wire degradation and failure assessments for more than a decade.