Once the unit operates correctly, it is time to test and inspect the generator components.
The main cause for GPU power interruption is a worn-out cable plug. The plug should be checked for scrapes and abrasions due to being dragged on the ground. This will cause a loose plug connection.
The terminals inside should be checked for wear and roundness. The cable itself should be checked for cuts and abrasions.
If the contactor is not a sealed unit, remove the cover and check the contact surfaces. If any pitting is evident, it can be quickly repaired with fine sandpaper and contact cleaner.
And finally, all wiring should be checked and the generator should be clean and free of debris.
About the authors:
Kenneth DeVolpi, manager of sales and marketing and special projects, has worked for Matheson for more than three years and has been in the aviation industry for more than 20 years, including 15 years with Northwest Airlines. Jason Chapman works in the company’s GSE maintenance department and gained GSE mechanical experience with the U.S. Air Force and has worked in the commercial GSE industry for 12 years.
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