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Results for: arcing

25.981 is Not a Barrier – Part 2

Michael Traskos
FAA regulation 25.981 covers the requirements of fuel tank ignition prevention. While there are numerous elements that must be considered as part of the 25.981 regulation, this is a Lectromec series of articles, and here we focus on the electrical hazards that must be identified and mitigated as part of certification. Read more

25.981 is Not a Barrier

Michael Traskos
One area of aircraft certification where electrical energy and risk have always been considered is the fuel system. While it is obvious that limiting the exposure of fuel to electrical energy is advantageous, how this gets addressed from a safety and certification perspective is far from obvious. Read more

Testing the Performance of AFCBs

Michael Traskos
Arc Fault Circuit Protection has been a technology that dates back to the 1990s. Despite this not being a new technology, the breath of its implementation is still limited. The device owes its inception to arcing events that occurred on in-service aircraft. Because of these events, the wiring community sought to create wiring that was arc track resistant, and the circuit protection community sought to cut off the arcing event before too much energy was released. This has been captured in the requirements of AS5692 for AC circuit protection, and AS6019 for DC protection Read more

Latest Developments in Wire and Cable – SAE 8A 8D Spring 2018

Michael Traskos
It is not often that you find more than two people in a room with a passion for aerospace wiring systems. One of the exceptions is the bi-yearly gathering of wiring system component and EWIS experts for the SAE 8A/8D committee. Last week, Chicago, Illinois was the host for this event that covered a wide […] Read more

Circuit Protection Selection Guidance

Tristan Epp Schmidt
Circuit protection devices have existed since 1864; one would think that selection of circuit protection would be a straight forward task. However, it is not. NASA developed a seven-step process for circuit protection selection and both EN3179 and AS50881 provide some guidance. In a past article, Lectromec began to consider the differences between two major […] Read more

Happy Holidays from Lectromec

Administrator
Lectromec’s lab did one last set of tests before the 2017 holidays. We bring you a polyimide Christmas tree powered by 270VDC. Read more

Humidity Test

There are several locations in aircraft where electrical connectors are regularly subject to high humidity conditions. Even without high humidity conditions, thermal cycling can wear down connector seals and create paths for fluid ingress. The system level impact can vary from signal degradation to shorting and electrical arcing. This test examines a connector’s resistance to […] Read more

Evaluating Secondary Wire Harness Protection Performance

Michael Traskos
There are several reasons to deploy secondary harness protection (SHP): chafe protection, maintenance protection, fire protection, harness cable management and, in some cases, arc protection. The EN6059-502 test examines secondary harness protections and the potential damage from arcing. This article runs through the test method and problems that could occur if the results are misinterpreted. […] Read more

Power over Ethernet and Potential Application Problems

Michael Traskos
The primary purpose of power over ethernet (PoE) is to use a single ethernet cable to provide a datalink and low-level power to devices. Since PoE became standardized in 2003, it has been implemented on a large range of ground based applications. There are several benefits to this implementation which include cable that is easily […] Read more

Fuel System Protection Part II

Michael Traskos
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