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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It depends on the location within the aircraft.
Qualification of Parts All parts that go on an aircraft must be qualified. This is necessary because the long-term exposure of higher voltages to EWIS components has not been thoroughly examined as0881 must be assessed.
Circuits and circuit protections must be evaluated that electrical sparks and electrical arcs are below this energy. Michael has been involved in wire degradation and failure assessments for more than a decade.
For the military, this may be part of design acceptance.
SAE-AS ADOPTION NOTICE WIRING AEROSPACE VEHICLE
Lectromec has written on this topic:. The AS Section 3. View Latest Blog Entries Close. Within many of the standards groups, efforts are being made to develop test methods and quantify the long-term impact. Additionally, the design must be verified to show compliance. Some of the lessons learned apply to the design level and some place a need for performance verification that requires testing and assessment.
For several decades now, the AS formerly the MIL-STD has been a fundamental knowledge base used for the installation of aircraft wiring as5088. He has worked on dozens of projects assessing the reliability and as05881 of EWIS components.
The configurations of electrical ground returns play an important role in the reliability of circuits. For those in need of laboratory testing to generate data for AS compliance, contact Lectromec. The specific requirements for this will vary depending on the certifying authority, but the basis may a50881 simplified as an EWIS failure, regardless or probability should not impact the aircraft airworthiness.
Often the electrical power source grounds are connected to the primary structure, but this as0881 be difficult in composite structures or alternative structure designs. All parts that go on an aircraft must be qualified.
So what does this mean for testing? The parts that are as5081 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. This accelerated aging should be structured to be a more severe representation of the in-service conditions.
MIL-W-5088L, MILITARY SPECIFICATION: WIRING AEROSPACE VEHICLE (10 MAY 1991) [S/S BY SAE-AS50881]
To determine the long-term reliability, accelerated aging may be necessary to show reliable performance data through the expected life of each component. In particular, these requirements set the maximum permitted as550881 before activation of circuit protection in any electrical arc scenario.
To circumvent the process or to accept parts from untrusted third parties can have significant long-term impacts on aircraft reliability.
The method by which this physical protection is achieved, either through separation, segregation, or circuit protection, the implemented method for protection must be verified. These tests may be done as focused tests or as part of DO testing.
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. 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 requirements laid out in this standard cover the electrical wiring interconnection system EWIS design and recommendations as5081 the selection of qualified parts. Each aircraft has a aas50881 service life and the installed equipment must either be identified as a life limited part or last the entire service life.
Testing for AS50881
AS specifies that epoxy adhesives are acceptable for use if they can be proven to be fully functional at maximum rated temperatures. This may as50818 contact resistance or bonding measurements.
Michael Traskos President, Lectromec michael. 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.
For commercial aircraft, this may be done as part of the overall certification package. To get to EWIS certification, there are some areas of the AS that require data supporting part selection and engineering decisions.