Short but interesting answer about why "fueldraulic" systems are still used, including on the Boeing 777, and F35: https://aviation.stackexchange.com/questions/

Short but interesting answer about why "fueldraulic" systems are still used, including on the Boeing 777, and F35: https://aviation.stackexchange.com/questions/24787/why-is-fuel-used-as-a-hydraulic-fluid https://aviation.stackexchange.com/questions/24787/why-is-fu...