12.30 Fuel Tanks

12.30.2 Describe the function of the following components of a simple fuel system:

(a) fuel tank, sump, drain point, supply line standpipe, vents, overflow drain;

• Fuel Tank:
  Stores the aircraft’s fuel supply. It is designed to safely contain fuel and supply it to the system during all phases of flight.
• Sump:
  The lowest part of the tank where water and contaminants collect, allowing them to be removed before reaching the engine.
• Drain Point:
  A valve at the sump used to drain and check for water or sediment during pre-flight inspection.
• Supply Line Standpipe:
  The fuel pickup point within the tank. It is positioned slightly above the bottom to prevent water and debris from entering the fuel system, ensuring only usable fuel is delivered.
• Vents:
  Allow air to enter and exit the tank to maintain atmospheric pressure as fuel is used, ensuring continuous fuel flow.
• Overflow Drain:
  Allows excess fuel to escape safely if the tank is overfilled or expands, preventing spillage into the aircraft structure.

Summary:
These components ensure fuel is stored safely, kept clean, properly vented, and reliably supplied to the engine.

(b) fuel quantity indicators;

Fuel quantity indicators provide the pilot with an indication of the amount of fuel remaining in each tank.