Figure 2.6. Fuel Flow Divider.

Figure 2.7. Air Shroud.

A word of caution;

extreme care must be taken when

cleaning or handling the nozzles,

since even the acid on the

fingers may corrode and produce a

spray pattern which is out of

tolerance.

c. Vaporizing

tube.

Engines such as the Lycoming T53

L11 use vaporizing tubes instead

of injector nozzles. The

vaporizing tube is a Tshaped,

ceramiccoated pipe, whose exit

faces upstream to the airflow.

Figure 2.8 shows a vaporizing

tube that is used on the T53L

ll.

2.8.

FUEL FILTERS

Gas turbine engines may

have several fuel filters

installed at various points

throughout the systems, one fuel

filter before the fuel pump and

one on the highpressure side

Figure 2.8. Vaporizing Tube.

after the pump. In most cases

the filter includes a relief

valve set to open at a specified differential pressure (PSID) between

inlet and outlet pressure. This gives the fuel a bypass if the

filter becomes clogged from contamination.