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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SAE-AS ADOPTION NOTICE WIRING AEROSPACE VEHICLE
It depends on the location within the aircraft. Some of the lessons learned apply to the design level and some place a need for performance verification that requires testing and assessment. Lectromec has written on this topic:. Michael Traskos President, Lectromec michael.
To get to EWIS certification, there are some areas of as5081 AS that require data supporting part selection and engineering decisions. 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.
So what does this mean for testing? Therefore, for electrical or electronic systems that introduce electrical energy into fuel tanks, such as as5081 quantity indicating systems, any electrical arcs or sparks that are created into any fuel tank should be less than microjoules during either ws50881 operation or operation with failures. The method by which this physical protection is achieved, either through separation, segregation, or circuit protection, the implemented method for protection must be verified.
This may include contact resistance or bonding measurements. For the military, this may be part of design acceptance. Often the electrical power source grounds are connected to the primary structure, but this can be difficult in composite structures or alternative structure designs. Consideration should be given for which zones the adhesive will be placed; it would not be wise to place an adhesive bond in as550881 or fuel exposed zones if no verification had been performed. Within many of the standards groups, efforts are being made to develop test methods and quantify the long-term impact.
Testing for AS | Lectromec
This accelerated aging should be structured to be a more severe representation of the in-service conditions. Circuits and circuit protections must be evaluated that electrical sparks and electrical arcs are below this energy. To circumvent the process or to accept parts from untrusted third as500881 can have significant long-term impacts on aircraft reliability.
The requirements laid out in this standard cover the electrical wiring interconnection system EWIS design and recommendations on the selection of qualified parts. Michael has been involved in wire degradation and failure assessments for more than a decade.
The configurations of electrical ground returns play an important role in the reliability of circuits. All parts that go on an aircraft must be qualified. The specific requirements for this will vary depending on the certifying aa50881, but the basis may be simplified as an EWIS failure, regardless or probability should not impact the aircraft airworthiness.
He has worked on dozens of projects assessing the reliability and qualification of EWIS sa50881. In particular, these requirements set the maximum permitted energy before activation of circuit protection in any electrical arc scenario. View Latest Blog Entries Close.
SAE-AS50881 ADOPTION NOTICE: WIRING, AEROSPACE VEHICLE (30-SEP-1998) [SUPERSEDING MIL-W-5088L]
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. For commercial aircraft, this may be done as part of the overall certification package.
AS specifies that a5s0881 adhesives are acceptable for use if they can be proven to be fully functional at maximum rated temperatures. For several decades now, the AS formerly the MIL-STD has been a fundamental knowledge base used for the installation of aircraft wiring systems.
What Is SAE-AS50881 and How Does It Relate To Wiring Harness Design?
The AS Section 3. Additionally, the design must be verified to show compliance.
This is necessary because the long-term exposure of higher voltages to EWIS components has not been thoroughly examined and must be assessed. To determine the long-term reliability, accelerated aging may be necessary to show reliable performance data through the expected life of each component.
Qualification of Parts All parts that go on an aircraft must be qualified. 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. These tests may be done as focused tests or as part of DO testing. For those in need of laboratory testing to generate data for AS compliance, contact Lectromec.