aircraft systems - Does a Boeing 737-800 Have a Ram Air Turbine (RAT)? - Aviation Stack Exchange https://aviation.stackexchange.com/questions/42565/does-a-boeing-737-800-have-a-ram-air-turbine-rat

"...If the fuel has run out and the APU cannot operate, two batteries provide at least 60 minutes of backup power for the electrical systems. The EDMPs can be powered in this stage, however they provide a high load."

バッテリーで(電動油圧ポンプを動かして)60分飛べるようにしてRAT廃止したらしい？＞＜