T53 Series – Starting Fuel System

System Design

Fuel flows through an external line from the fuel control to the starting fuel solenoid valve. The solenoid is a two-position cockpit controlled valve, electrically opened and spring-loaded closed incorporating an internal 100 mesh filter. With the valve energized to the open position, fuel flows through an external line and connects to the starting fuel manifolds. The starting fuel manifolds have one fuel inlet port, which is then split by the start fuel flow divider into two stainless steel lines with two outlet ports on both halves. Fuel enters the combustor at the nozzle tip with a fine cone mist. Combustor air pressure is directed through holes in the nozzle shroud and discharged at the nozzle tip for cooling purposes.

At 40 percent N1 speed, the ignition, starting fuel solenoid valve and starter are de-energized to close and stop the flow of starting fuel. The check filter valve opens and bleeds pressurized air from the combustor to purge fuel from the starting fuel lines and nozzles.

Components Include


Manifold Assemblies and Starting Fuel Nozzles – Accumulation of deposits (coking) can be minimized, by periodically having them cleaned and functionally tested on intervals of around 300hrs of operation. Get a Quote