fuel drainage system

fuel tank drainage

fuel tank water drainage

drainage system

drainage

drainage channel

water drainage

drainage sump

cylinder drainage

drainage course

drainage water

drainage wind

Proton Exchange Membrane Fuel Cell (PEM fuel cell, PEMFC)

fire extinguishing system sprinkler system and fire alarm system

bulk fuel delivery system (BFDS)

fuel injection system

fuel storage and distribution system

jerk-pump fuel system

fuel gravity system

fuel supply system

fuel system failure

fuel control system

fuel system hose

fuel system pipe

fuel system

merchant ship communication system (mercomm system)

multiple launch rocket system (MLRS); multiple rocket launcher system

Air Force weapons system / AF weapon system

attitude-and-heading reference system / attitude and heading reference system (AHRS)

selective calling system, SELCAL system

Unmanned Aerial System / Uncrewed Aircraf System (UAS)

system of system common operating environment

air-fuel mixture