The ground bond test specialist.

BLTU4 is an automatic and portable bond, loop and joint resistance tester with built-in operator guidance.

 It provides automatic testing of ground bonding points on aircraft and other large structures and records the test data for full traceability.  Measuring at 1KHz frequency, the BLTU4 is listed in COMAC ARJ21 maintenance manuals, and is also compliant for Airbus and Bombardier aircraft.

Main BLTU4 Applications

BLTU application 1 - aircraft helicopters and large structures

Measuring resistance on aircraft, helicopters, UAV’s & large structures such as wind turbines, & chemical plant infrastructure

BLTU application 2 - Bond resistance between structural elements

Bond resistance between structural elements

BLTU application 3 - loop resistance and integrity of cable shields and bonding straps

Loop resistance and integrity of cable shields and bonding straps

joint resistance
Joint resistance diagnostics
BLTU application 4 - testing during manufacture and scheduled checks
Testing during manufacture and as part of safety compliance tests during scheduled maintenance
  • 1KHz frequency
  • Equivalency to TS11194 loop tester approved by Airbus
  • Suitable for use on Bombardier aircraft 
  • Bond test resistance range from 0.03mΩ to 20Ω
  • Loop test resistance range from 1mΩ to 200mΩ
  • Joint test resistance range from 0.1mΩ to 200mΩ
  • On-screen operator instructions
  • Lightweight so only requires a single operator
  • Paperless process logs and uploads test results, guaranteeing traceability
  • Pass/Fail status indication on couplers and bond probes
  • Dimensions 345mm length x 295mm width x 150mm depth
  • Weight 7kg / 15.5lbs (Unit only)
  • Integrated LCD 10.4” touchscreen monitor
  • Smart Li-Ion “hot-swap” batteries
  • Soft-start current source prevents arcing
  • Auto and manual modes
  • Active couplers and bond probes – no need to touch screen
  • Test management software enables an automated test process
  • Powered by MKAT test management software, which was rated ‘easy to use’ by 82% of our customers in our 2022 survey.

Some of our BLTU customers

2.5 BLTU Customer logo 1 Airbus
2.5 BLTU Customer logo 2 Comac
2.5 BLTU Customer logo 3 GKN
2.5 BLTU Customer logo 4 Spirit


“We really value the flexibility of the system and the quality of the results; the F2500 delivers exactly what we asked for.”

Zander van der Steege

Project Test Engineer, Santon Switchgear

“The MK Test solution…improves performance and streamlines manufacturing.”

Jakub Lukasiewicz

Space Programs Production Manager, PZL Warszawa-Okecie

“MK are the industry standard for automated test equipment. Using their equipment has greatly improved our efficiency and accuracy when testing.”

Sam Baker

Sales Manager, Itel Electronics

“RTS is an innovative solution compared to traditional wiring testers. It allows workload reduction by fast set-up and fast testing.”

Olivier Boizot

Project Leader, Airbus

“Faster testing, easier to use, and [testing] can be performed by one person.”

An ExLRT user from Lufthansa Technik

“The MK tester is very reliable – the repeatability is what makes it valuable.”

Peter Hicks

Chief Electronics Engineer, Pandect Precision Components

BLTU blog articles

Download BLTU4 brochures

BLTU4 brochure_EN

Product enquiry form

Enquiry Form
Enter the Captcha


Generic specifications thumbnail

Submitting this form will pass your details onto one of our team who will be in touch to send you the technical product data sheet(s) you've requested.


MK Test uses the information you provide us to contact you about relevant content, products and services. You may unsubscribe from these communications at any time. The information will not be used for any third-party marketing. For information on how to unsubscribe, as well as our privacy policy and commitment to protecting your privacy, read our Privacy Policy.