How does the Longitude 700 handle dual generator or essential bus failures?

• A. Use alternate power sources, isolate faults, follow QRH and dispatch guidance, prepare for alternate power operation.
• B. Disable all electrical systems and land immediately.
• C. Ignore the fault and continue as normal.
• D. Require manual reboots of generators at every leg.

Answer: (A)

When the Longitude 700 faces a dual generator failure or loss of the essential bus, the electrical system is managed to keep the aircraft safe by prioritizing critical power and removing nonessential loads. The correct approach is to bring up alternate power sources, isolate the fault to prevent further issues, and follow the QRH and dispatch guidance to manage the situation and plan for continued operation on alternate power. Practically, you switch to the remaining healthy power source (such as the other generator, the APU, or external power if available), use standby or battery power to keep essential avionics and flight controls powered, and shed nonessential systems as outlined in the procedures, then proceed according to the QRH for alternate power operation or destination/diversion as required. This is preferred to immediately disabling all electrical systems, ignoring the fault, or attempting only generator reboots, which do not align with how the system is designed to maintain safety and controllability.