How to Troubleshoot No Fault Founds in Complex Wire Harnesses?

How to Troubleshoot No Fault Founds in Complex Wire Harnesses?

Intermittence fault is a known problem in aircraft due to a large number of electrical wire and complex systems that make an aircraft. Newer aircraft have more computer-based system which has even more wiring than legacy aircraft.

 

Why aircraft intermittences are so difficult to detect?

Small-Engine_CFM56-5B_CDG (5)

Finding a problem in a bundle of wire-harness is a complex challenge. Sporadic intermittences that appear in mid-air are detected and reported by pilots. Once the aircraft is back on the ground these intermittences are difficult, if not impossible for technicians to replicate. Aircraft vibration can not easily be replicated, and many times the intermittences happen in fractions of milliseconds.

Therefore,  problems observed in mid-air can not easily be replicated on the ground. Technicians rely on ohmmeters to run conductivity testing, selecting line by line, looking for the problem. The tool of choice, a multimeter, is set up to find transients with millisecond accuracy. There are two challenges with this approach:

 

  1. Harnesses are interconnected systems of multiple wires, and a multimeter is only capable of testing one wire at a time.
  2. It is possible that the transients occur in less than a millisecond, undetectable by the multimeter.

Problems observed in mid-air can not easily be replicated on the ground.

Hence, the multimeter works to detect open circuits, which is considered hard or semy hard intermittences. But not accurate enough to detect random sporadic intermittences at low-level noise or micro-breaks.

 

New Technology

IFD - 256 Voyager - Barfield Inc - Universal Synaptics-min - Intermittence Analyzer

New technology has emerged. It takes into consideration all electrical lines by testing each line simultaneously with a nanosecond accuracy in a closed-loop environment. This technology uses a hardware version of a neural network, in which signals are sent to each node combining all feedback back to the analyzer. Then, the system could be checked as a whole, and not each line separately, creating the necessary environment to detect any fault.

New technology has emerged. It takes into consideration all electrical lines by testing each line simultaneously with a nanosecond accuracy in a closed-loop environment.

The United States Department of Defense is one of the early adopters of this technology that tests LRU, by extending the mission capability of their fleet and reducing operating costs.

Several case studies have come to light recently and a selected group can be downloaded here:

Selected Aircraft Case Studies:

  1. F-16 Nose Landing Gear Harness.
  2. Boeing 777 GE90 Engine Harness
  3. Total Air Temperature Probes .
  4. Pratt & Whitney V2500 Engine Harness
  5. AH-64 Apache EWIS Testing 
  6. Elevator and Aileron Computer (ELAC)

Barfield Inc., in partnership with Universal Synaptics, is bringing this technology to operators of commercial and business aircraft.

If you still have more questions or want to learn more about this technology, please fill out the form below.

Electrostatic EPA Approved Disinfectants Dashboard

Electrostatic EPA Approved Disinfectants Dashboard

 The Environmental Protection Agency ( EPA) recently announced the approval of the use of disinfectant electrostatic equipment. With the emergence of electrostatic equipment manufacturers of disinfectant products will have to display on their labels, the compatibility of applying their product using an electrostatic sprayer.

The popularity of electrostatic sprayers is their ability to charge disinfectant particles positively, once sprayed, they adhere to negative surfaces, wrapping them around. Barfield, uses the Cube from On Target Spray Systems for its disinfecting needs.

To help navigate the information from the  EPA our team of data visualization extracted the information from their website creating the dashboard below.  It is designed to help our aviation partners better understand the type of product, kill time, and applications.

To follow what OEMs approve regarding aircraft interior disinfection, please refer to their manuals or service information letters. For corporate aircraft, the National Business Aviation Association has compiled good information. To learn more, click on the following link Coronavirus Disease 2019 ( COVID-19)

Below is a step by step guide on how to use the dashboard:

The following menus are available:

  • Select Formulation Type: There are different options available. Here Dilutable: Electrostatic spray, Ready-to-use: Electrostatic spray and Ready-to-use: Electrostatic spray ( Clorox Total 360 system) has been selected
  •  Kill Time: It filters the available kill time by product selected

Explanation of tables and charts:

  • EPA approved number by product name (bottom left).
  • List of companies with an electrostatic approved product (top right).
  • Active ingredient by Formulation Type (bottom right).
  • Total number of approved products depending on the selection (middle).

Try interacting with the dashboard below:

EPA List N- Disinfectants for COVID-19 Dashboard

This information was last updated on 10/08/2020. 

As new products are approved for electrostatic spraying use, our team will be updating this dashboard as often as possible.

You might also be interested in the following related articles:

Electrostatic Spraying in Aircraft Operations

 How Electrostatic Spraying Works?

Do you want to learn more about it?

Click here to check the videos and technical specifications

How to use a Frequency Domain Reflectometer in Aviation?

How to use a Frequency Domain Reflectometer in Aviation?

Barfield Inc., in partnership with Bird, collaborated in the development of the FlightHawk ( formerly known as SiteHawk-AV)This is a Frequency Domain Reflectometer (FDR), commonly used in the telecommunication industry, modified to be used in aviation operations. It can usually be found under Part Number: 7003A001-5 in many manuals.

Training on how to use the FlightHawk:

The FlightHawk is a Frequency Domain Reflectometer that connects from the end of the coaxial cable, testing if damages exist by identifying the Distance to Fault (DTF) and capable of performing a frequency sweep to the antenna.

The following videos provide instructions that allow the testing of any type of antenna and coaxial cables with this Frequency Domain Reflectometer, in any navigation systems of any aircraft. 

  1. Introduction to FlightHawk ( formerly known SiteHawk-AV).
  2. Antenna and Cable Health Checks: Boeing Use case.
  3. How to Calibrate the FlightHawk.
  4. VSWR and return loss sweep with the FlightHawk.
  5. Distance to Fault Test Using FlightHawk.
  6. Sending files from the FlightHawk to an Android phone.
  7. Save files from FlightHawk to a USB Drive.

1. Introduction to the FlightHawk

This video is an introduction of the FlightHawk. It explains what it consists of and what features are included.

2. Antenna and cable health checks: Boeing use case 

This video is a presentation from Boeing, showing details of the use of the FlightHawk in an aircraft.

3. How to calibrate the FlightHawk

This video shows the process of how to calibrate the Frequency Domain Reflectometer.

4. VSWR and return loss sweep with the FlightHawk

This video shows how to do a Voltages Standing Wave Ratio (VSWR) and return loss frequency sweep.

5. Distance to fault test using the FlightHawk

This video shows the Distance To Fault (DTF) test procedure.

6. Sending files from the FlightHawk to an Android phone

This video shows how to send files from the Frequency Domain Reflectometer to an Android phone. It is a great tool for saving images and results from tests performed.

7. Save files from FlightHawk to a USB drive

This video is about how to save files from the FlightHawk to a USB drive. It is also, a great tool for saving images and results from tests performed.

We hope with these videos, to give you an overall understanding of the FlightHawk Frequency Domain Reflectometer (FDR). The videos showed how to perform Distance to Fault (DTF) and VSWR testing. For Boeing operators, there is an additional option, a Boeing App, that can be installed on your device.

If you still have more questions or want to send us a quote, please fill out the form below.