Heat shrink tubing application and aircraft EWIS components

June 30, 2014 Michael Traskos

Heat shrink tubing can be found in nearly every location on aircraft and can interact with aircraft EWIS components. These materials protect wire repairs, provide additional abrasion protection, and prevent the ingress of fluids (and in a pinch, may be used as a secondary harness support when other options are not viable). Although this product […] Read more

Life prediction of aircraft EWIS components

May 29, 2014 Michael Traskos

Aircraft vehicle reliability rests on well-designed components maintaining full functionality through the entire life cycle, or at the very least, maintaining full functionality until a predictable life limit is reached so that sustainment activities can be performed. Selection of wires and EWIS components is no different. The selection process starts with the functional requirements (electrical […] Read more

Considerations for Electrical Bonding

May 15, 2014 Michael Traskos

Electrical bonding is the practice of connecting equipment cases or structure to ground to prevent electric shock. This provides a return path for any stray voltage that the case may be exposed to via component failure (e.g. wire shorted against case). The reason why proper electrical bonding techniques are so important is that it protects […] Read more

EWIS: A 13-minute summary of MIL-HDBK-525

April 30, 2014 Michael Traskos

This Lectromec presentation provides a brief summary of MIL-HDBK-525, “Electrical Wiring Interconnect System (EWIS) Integrity Program.” It provides a starting point for those involved in Mechanical Equipment and Subsystems Integrity Program (MECSIP) or those new to the EWIS service life extension efforts. This fifteen minute presentation is a good description of Electrical Wire Interconnect Systems […] Read more

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

April 14, 2014 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

The “Big 3” aircraft wire system degradation assessment options

April 9, 2014 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

7 considerations for aircraft wire separation

March 30, 2014 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

EWIS regulatory compliance with 25.1707, Part VII

February 28, 2014 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

February 25, 2014 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

February 20, 2014 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

Search