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By: Michael Traskos

7-step process for aircraft wire size and circuit protection selection

Michael Traskos
Sometimes the design guidance that is a couple of decades old is still valid. The following flowchart is from the NASA Technical Memorandum 102179 – 1991. The chart provides a flow for the design considerations for circuit protection, starting with determining the current need and ending with the implementation of the system. The 7 steps […] Read more

What you missed from the SAE meeting regarding aircraft wire testing

Michael Traskos
If you had other business commitments and couldn’t make the recent SAE 8A/D meeting this week that included topics related to aircraft wire testing, we have put together a quick summary from the committee meetings. RoHS Compliance The Reduction of Hazardous Substances (RoHS) has been something the aerospace industry has been struggling to comply with […] Read more

The “Big 3” aircraft wire system degradation assessment options

Michael Traskos
If you have concerns about aircraft wire system degradation and need to assess the condition of an aircraft’s wire system, there are several options. For those looking for opens and shorts type faults, HiPot and/or Time Domain Relectometer (TDR) equipment are great options. To determine the impact of wire problems with the fleet, maintenance logs […] Read more

Aerospace electrical systems news

Michael Traskos
The AEROSPACE Electrical Systems Expo took place on April 1 – 3, 2014 in Long Beach California and drew the usual suspects. There was a good representation from all parts of the aerospace electrical systems field and the supporting vendors. Overall, the year-to-year technology innovations appear to be more of an evolutionary improvement rather revolutionary […] Read more

7 considerations for aircraft wire separation

Michael Traskos
The development of a safe, reliable, and easy to maintain Electrical Wire Interconnection System (EWIS) is a challenging task. The considerations range from selecting each EWIS component, to matching the load and Electromagnetic Interference (EMI) requirements of the connected devices, to ensuring your design can maintain performance across multiple zone environments. EWIS design takes a […] Read more

2 EWIS insights from a presentation at the AIAA conference

Michael Traskos
Th 51st AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference was held on January 2010 and included presentations of a wide range of technical papers. From the perspective of EWIS, authors McCabe and Cyphers reported on A Study of Over-Current Protection, Electrical Arcing, and Fire Protection. Their research objective was to gather data for ballistic threats […] Read more

Aircraft EWIS high voltage testing considerations

Michael Traskos
There are two factors that need to be considered when using aerospace wires/cables for higher voltage systems: (1) Determining the long-term insulation life impacts of high voltage utilization, and (2) the impact that high voltage testers may have through repeat high potential testing. In this article we will focus on the second factor. Read more

EWIS regulatory compliance with 25.1707, Part VII

Michael Traskos
This is the final article on the series devoted to the FAA regulation 25.1707 on EWIS separation. The previous six articles in this series are listed below: Jan 20, 2014 Part I: Damage assessment for 25.1707 Jan 28, 2014 Part II : EMI compliance in 25.1707 Feb 7, 2014 Part III: Heavy Current Cables in […] Read more

EWIS regulatory compliance with 25.1707, Part VI

Michael Traskos
This is the sixth article in the series focused on FAA 25.1707 that discusses electrical wire interconnection system (EWIS). The previous articles in this series are listed below: Jan 20, 2014 Part I: Damage assessment for 25.1707 Jan 28, 2014 Part II : EMI compliance in 25.1707 Feb 7, 2014 Part III: Heavy Current Cables […] Read more

EWIS regulatory compliance with 25.1707, Part V

Michael Traskos
Each of the last four articles has focused on a subpart of the FAA 25.1707 regulation. Jan 20, 2014 Part I: Damage assessment for 25.1707 Jan 28, 2014 Part II : EMI compliance in 25.1707 Feb 7, 2014 Part III: Heavy Current Cables in 25.1707 Feb 15, 2014 Part IV: Grounding and Power Separation Because […] Read more