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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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. Additionally, the design must be verified to show compliance. He has worked on dozens of projects assessing the reliability and qualification of EWIS components. For the military, this may be part of design acceptance. 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.
The AS Section 3. AS specifies that epoxy adhesives are acceptable for az50881 if they can be proven to be fully functional at maximum rated temperatures.
The requirements laid out in this standard cover the electrical wiring interconnection system EWIS design and recommendations on the selection of qualified parts. It depends on the location within the aircraft. All parts that go on an aircraft must be qualified. as58081
Michael Traskos President, Lectromec michael. Within many of the standards groups, efforts are being made to develop test methods and quantify the long-term impact. This is necessary because the long-term exposure of higher voltages to EWIS components has not been thoroughly examined and must be assessed.
For several decades now, the AS formerly the MIL-STD has been a fundamental knowledge base used for the installation of aircraft wiring systems. 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 goal to not use non-compliance parts.
The method by which this physical protection is achieved, either through separation, segregation, or circuit protection, the implemented method for protection must be verified. Some of the lessons learned apply to the design level and some place a as550881 for performance verification that requires testing and assessment. This accelerated aging should be structured to be a more severe representation of the in-service conditions.
Testing for AS | Lectromec
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. To get to EWIS certification, there are some areas of the AS that require data supporting part selection and engineering decisions.
Often the electrical power source grounds are connected to the primary structure, but this can be difficult in composite structures or alternative structure designs.
To determine the long-term reliability, accelerated aging may be necessary to show reliable performance data through the expected life of each component. Each xs50881 has a specified service life and the installed equipment must either be identified as a sa50881 limited part or last the entire service life.
Circuits and circuit protections must be evaluated that electrical sparks and electrical arcs are below this energy. For those in need of laboratory testing to generate data for AS compliance, contact Lectromec. The configurations of electrical ground returns play an important role in the reliability of circuits.
Testing for AS50881
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. So what does this mean for testing? This may include contact resistance or bonding measurements. Qualification of Parts All parts that go on an aircraft must be qualified.
These tests may be done as focused tests or as part of DO testing. Lectromec has written on this topic:.
MIL-W L WIRING AEROSPACE VEHICLE
View Latest Blog Entries Close. Michael has been involved in wire degradation and failure assessments for more than a as05881. For commercial aircraft, this may be done as part of the overall certification package.
To circumvent the process or to accept parts from untrusted third parties can have significant long-term impacts on aircraft reliability. In particular, these requirements set the maximum permitted energy before activation of circuit protection in any electrical arc scenario.