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Results for: hazards of electrical arcing

Improving aerospace wire reliability by understanding arcing vs protection schemes

Prior to the launch of the space shuttle Discovery in July of 2005, NASA engineers discovered a previously unidentified hazard. Perhaps they should have gotten a better understanding of aerospace wire reliability. Power wires leading to a heater in the space shuttle were collocated with wires controlling the reaction jets used for in-orbit maneuvers. There were […] Read more

Taking a look at aircraft wire testing and evaluation

For the past thirty years, Lectromec has been a leader in the area of aerospace wire testing and evaluation. In order to provide aerospace professionals with information to increase their knowledge of this complex topic, we began creating educational materials. Accordingly, Lectromec has published almost two-hundred articles, distributes a monthly newsletter, has a podcast, and […] Read more

Perspectives on arc fault protection

Lectromec has published several articles and a white paper on our web site that discuss the hazards of electrical arcing and how they can be mitigated. In order to broaden the discussion, this article will try to give our readers some insight on systems that offer solid state protection, generally called arc fault circuit protection […] Read more

Protected Harness Design

Wiring harness protection materials address needs such as fire protection, physical damage protection, chemical protection, and wire management but may also present challenges such as overheating or difficulty of access for maintenance activities. In this article, we elaborate on some of the common uses of added harness protection and address many of the benefits and drawbacks of open vs protected harnesses. Read more

CFR 25.1717 – Circuit Protection and EWIS

Circuit protective devices are circuit components whose purpose is to disconnect power to the circuit in the event of a fault condition. The fault conditions vary based on the circuit type, attached equipment, and power capacity of the attached circuit. Some common fault conditions include overheating, overcurrent, and electrical arcing.

To meet the diverse needs of varying circuit designs and functions across electrical systems, several types of circuit protection are available. Each type has benefits and drawbacks, and it is important to evaluate each to determine the best option for a given electrical system. Read more

ASTM F3309- A Simplified Safety Analysis for Small Aircraft

Aircraft safety requirements vary depending on the size of the aircraft. Typically, larger aircraft have stricter requirements as a catastrophic failure in large aircraft has the potential for a much larger loss of life than that of small aircraft which hold far fewer passengers. The ASTM F3309 provides a simplified qualitative approach to evaluate the safety of small aircraft. Read more

EWIS Physical Hazard Assessment

Aircraft system safety assessments are not a new concept. These safety assessments have a defined process for evaluating an aircraft which involve identifying its failure modes, top-level events, and eventual means to achieve an unsafe condition. Documents such as the SAE ARP4761 provide guidelines and methods for conducting the safety assessment process on civil airborne systems and equipment.

To follow the typical development cycle, the aircraft failure hazard assessment (FHA) is followed by the system failure hazard assessment and performed in parallel with the preliminary system safety assessments (PSSAs). This then evolves into the system safety assessments (SSA) and common cause analyses (CCAs). For those with a systems reliability background, this should all be second nature. For the rest of the community, these are often terms that we come across because of our work in this field.

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High Voltage Impact the Aircraft Wiring System

For aerospace applications, high-voltage power is a rapidly growing interest and being addressed across several industry technical committees. The basic idea is that the power generation is increasing the supplied voltage and creating a need for the electrical wiring interconnects systems (EWIS) to have components designed to sustain these higher voltages for the entire length of the aircraft life. Just as it should not be expected for a connector to operate in a 300°C environment if it is only rated to 150°C, a connector should not be expected to perform perfectly with voltages exceeding its voltage rating. Read more

25.981 is Not a Barrier – Part 2

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

Publications

EWIS Service Life Extension Case Study This 10-page white paper reviews recent work performed by Lectromec supporting a military fleet’s Service Life Extension Program (SLEP). It covers project initiation, data gathering, evaluation, and the recommendations that supported the decisions necessary to extend the service life of the aging fleet. This case study is a review […] Read more