Скачать или смотреть B787 Integrated Surveilance System (ISS) is 115V input only, no backup UPS.

This video is simply a response to a viewer who attempted to say that the transponder stayed online because its battery backed.
It is not. its only powered by alternating current, and the only source for that is the RAT ( which had n0t started supplying power at these timestamps) or the engines. This was the final timestamp that the transponder was able to ping, and it was right after the hydraulic power form the rat was achieved. The availability of 115v AC for the trasnponder prooves the engins generators were still producing electrical power to feed the 235 V to 115V transformers at this time, which means the rat deployment for engine failure would not have been triggered at this time. This prooves the cause of RAT deployment is the loss of the instrument buses, which can only happen if both the supply and backup is dead. the backup is the battery,. the battery was dead. the battery was shorted. If you cannot understand this, that is your problem not mine.
GOODNIGHT