Gulfstream G500 Oral Practice Exam 2026 - Free Gulfstream G500 Exam Practice Questions and Study Guide

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If the Right Essential TRU fails, the Aux TRU will power the Right Essential DC bus. If Left ESS TRU also fails, what will occur?

External power cart will power both ESS DC buses

The Right ESS DC bus will be powered by the Left ESS TRU

Aux TRU will take over LH ESS DC bus and the right ESS DC bus will be powered by the BATTS

The system is designed with two essential DC buses that are normally fed by their own TRUs, with an Auxiliary TRU ready to back up when primary TRUs fail. If the Right Essential TRU fails, the Auxiliary TRU takes over to power the Right Essential DC Bus so critical systems on that bus stay energized. If the Left Essential TRU also fails, the Auxiliary TRU shifts to powering the Left Essential DC Bus to keep that side alive. With both primary TRUs down, there’s no source left to feed the Right Essential DC Bus except the battery system. So, the Left Essential DC Bus stays powered by the Auxiliary TRU, while the Right Essential DC Bus is powered by the BATTS. This keeps the essential loads powered in a degraded but safe configuration, rather than leaving them unpowered.

Both Right and Left ESS DC buses will be unpowered