Boeing 787 KSV Practice Test 2026 – All-in-One Guide to Master Your Skills and Achieve Exam Success!

RAT power is a backup source that keeps essential electrical and hydraulic systems operating if the main power sources fail. When the RAT does not deploy, the aircraft must be managed with the abnormal procedures that cover loss of RAT and emergency power, and you rely on the remaining power sources (such as the APU and engine-driven generators, plus battery) as directed by the checklist until power is restored or stabilized. This keeps critical systems powered and allows you to maintain control and perform a safe approach, rather than continuing as if nothing is wrong or shutting down all power. After stabilizing with the remaining sources, a priority landing can be coordinated as needed, but the immediate step is to follow the abnormal procedures and conserve power per the checklist.