ASA fuel and fuel metering systems

What are the two basic types of turbine engine fuel?

Jet A and Jet A-1 (kerosene-based, similar to military JP-5); and Jet B (gasoline-based, similar to military JP-4).

What are two reasons Prist is used in turbine engine fuel?

1. It acts as an anti-freeze agent that lowers the freezing point of any water that precipitates out of the fuel. 2. It acts as a biocidal agent that kills the microbial growth (scum) that forms in fuel tanks and causes corrosion.

What are three purposes for boost pumps in an aircraft fuel system?

1. To provide fuel pressure for starting the engine. 2. To pressurize the fuel lines to prevent vapor lock. 3. To transfer fuel from one tank to another.

What is done in most aircraft fuel systems to prevent vapor lock?

Boost pumps in the fuel tank pressurize the fuel in the lines and force the fuel into the fuel metering system.

What are two types of electronic fuel controls for turbine engines?

Supervisory Electronic Engine Control (SEEC) and Full Authority Digital Electronic Control (FADEC).

What position should the flight deck fuel metering and control (or fuel condition lever) be set for starting a turbine engine?

The normal starting sequence is: 1) Rotate the compressor with the starter. 2) Turn the ignition ON. 3) Open the engine fuel valve either by moving the throttle to idle or by moving a fuel shut-off lever or turning a switch.