@PeterLG @Gargron Failure of one hydraulic system will result in a precautionary emergency landing. Emergency <> Unsafe. It is standard practice to tow an aircraft after a hydraulic failure. I've been on two planes that made emergency landings (one engine failure, one electrical issues in the cockpit) and in neither case did I feel unsafe. Attached as an example is a system diagram for a 737 hydraulic system.