Mixing aviation gasoline with jet fuel in a turbine engine can lead to deposits due to tetraethyl lead on which part?

Mixing aviation gasoline with jet fuel in a turbine engine can lead to deposits due to tetraethyl lead on which part?

• A. Turbine blades
• B. Compressor blades
• C. No deposits form
• D. Piston rings

Answer: (A)

Tetraethyl lead from avgas can form lead-containing deposits when burned in a turbine engine. The turbine section runs at very high temperatures, so the lead compounds produced from TEL can vaporize and then condense on hot metal surfaces. The turbine blades are the parts most exposed to these hot, reactive combustion products, so they accumulate a varnish-like lead deposit that can affect aerodynamics and cooling. Compressor blades are cooler and upstream of the combustion process, making deposition less likely, and piston rings are components of piston engines, not turbines. So the turbine blades are the part where TEL deposits would most readily form.

Tetraethyl lead from avgas can form lead-containing deposits when burned in a turbine engine. The turbine section runs at very high temperatures, so the lead compounds produced from TEL can vaporize and then condense on hot metal surfaces. The turbine blades are the parts most exposed to these hot, reactive combustion products, so they accumulate a varnish-like lead deposit that can affect aerodynamics and cooling. Compressor blades are cooler and upstream of the combustion process, making deposition less likely, and piston rings are components of piston engines, not turbines. So the turbine blades are the part where TEL deposits would most readily form.