Boeing approves loop tester for production and maintenance


US aircraft-maker Boeing has approved MK Test’s bond tester for use in loop resistance measurement tests in a service letter released last month.

The Bond Loop and Joint Resistance Tester (BLRT) from the UK-based company can now be used as a replacement for the legacy Loop Resistance Testers (LRT) in both production and maintenance tasks on all unfueled production Boeing commercial aircraft.

MK Test System’s BLRT is the only approved alternative to the existing LRT from BAE Systems.

The service letter from Boeing notes that “Boeing has independently verified MK Test Systems BLRT for use in verifying the functionality of lightning and HIRF protection features. Through laboratory and airplane testing, the Boeing Company has verified that loop and joint measurements are as accurate or more accurate as compared to the LRT on the same wire harness.”

Carl Bullock, managing director of MK Test Systems said, “The approval confirms Boeing’s confidence in the BLRT. We’re proud to have developed in partnership with Boeing a product which makes electrical testing easier and quicker for OEMs and MROs all around the world.”

The BLRT provides fully automated data collection capabilities on its integrated computer and is capable of guiding users through complete test sequences using graphic and textual user prompts for test set up and measurement. Measured values and Pass or Fail status are reported and test results can be automatically recorded to customer network resources.

MK Test Systems, which has provided automatic electrical harness testing systems for almost 30 years, expects demand for the BLRT to grow significantly following Boeing’s approval.

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About Author


Ben has worked as a journalist and editor, covering technology, engineering and industry for the last 20 years. Initially writing about subjects from nuclear submarines to autonomous cars to future design and manufacturing technologies, he was editor of a leading UK-based engineering magazine before becoming editor of Aerospace Testing in 2017.

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