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Standard & Regulation

Fuel System Protection Part II

Lectromec has written multiple articles on fuel system safety as it relates to SFAR88, AC 25.981, and AC 25.1701. In this article, we continue the discussion by reviewing some of the recommendations that came out of the NTSB report on TWA 800 and subsequently influenced AC 25.981. Some of these recommendations may not apply to […] Read more

Developments in High-Voltage

The first meeting of the 8A and 8D committees for 2017 was held in Kissimmee Florida in April 2017. There were several topics discussed and voted upon that will have an impact on future wire component and system designs (previous article on SAE 8A/8D committee meeting available here). One common theme in the meeting was […] Read more

Next 15 Years of EWIS Design

The field of aircraft Electrical Wiring Interconnection Systems (EWIS) has changed significantly in the last two decades. These changes have impacted the design, installation, maintenance, and sustainment of electrical wiring systems on aircraft. For example, increased electrical load requirements, materials restrictions, system safety assessment, and new regulations are just some of the areas that have […] Read more

How many Cables Should be Shielded?

A common question when it comes to designing an aircraft EWIS is which of the cables should be shielded? There are several standards, such as MIL-STD-461, “Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment” provide an excellent basis for topics and testing that should be considered. But for those that are […] Read more

Avoiding Fuel Tank Ignition

The number of aircraft accidents involving fuel tank ignition has thankfully been very low. However, the growing use of electrical power in aircraft has increased the number of wires and the likelihood of being routed near fuel system components. The increased electrical component density comes with a higher probability of a failure event occurring. In […] Read more

Testing for AS50881

For several decades now, the AS50881 has been a fundamental knowledge base used for the installation of aircraft wiring systems. The requirements laid out in this standard cover the electrical wiring interconnection system (EWIS) design and recommendations on the selection of qualified parts. Additionally, the design must be verified to show compliance. For commercial aircraft, this may be done as part of the overall certification package. For the military, this may be part of design acceptance. This article covers some of the testing necessary for showing compliance with AS50881.

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Use of Cables on Aircraft – Part 3 – Testing

To continue the series of articles on NEMA27500 cables discussing their use on aircraft (part 1 and 2), this article focuses on the several tests that are necessary for cable verification and certification. There is some level of performance verification for each part of an aircraft cable. Most cable assessment tests focus on the performance […] Read more

Use of Cables on Aircraft – Part 2

In this article, we will continue the discussion by exploring the NEMA27500 cable. Four sections were covered in the Part 1 (Specification, identification and shield coverage, conductor size, and wire specification). The remaining three parts covered here are the basic component wires, shielding materials, and the jacket materials. Read more

Use of Cables on Aircraft – Part 1

Electrical wire cables are an integral part of an aircraft’s Electrical Wire Interconnection System (EWIS). It would be difficult to imagine the design of an aircraft electrical system without the use of electrical cables. The use of cables in aircraft has simplified the formation of wire harnesses and installation of electrical components (think of the […] Read more

11 improvements to MIL-HDBK-522 for aircraft wire systems

One of the best handbooks on EWIS routine inspection for aircraft wire systems is the military handbook MIL-HDBK-522, Guidelines for Inspection of Aircraft Electrical Wiring Interconnect Systems. The first version of the handbook was released in 2010 and provided a good starting point for EWIS inspection guidance. This guidance has been updated with the release […] Read more