GTS Mod 2

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What are the primary control parameters for the hydro-pneumatic fuel control unit?

RPM

How is fuel flow controlled in the hydro-pneumatic fuel control unit?

Metering valve position

What returns excess fuel back to the pump inlet in the fuel pump system?

Bypass valve

Which parameters control the metering valve pneumatically in the hydro-pneumatic fuel control unit?

Compressor outlet pressure and inlet air temperature Signup and view all the answers

What ensures the pressure differential across the metering valve is unaffected by its movement?

Pressure regulator in the bypass valve Signup and view all the answers

What happens to the fuel flow when the shut-off valve closes?

There will be no fuel flow. Signup and view all the answers

What causes the fuel pump pressure relief valve to control maximum fuel pressure?

Closing the differential pressure regulating valve. Signup and view all the answers

What happens to engine speed once combustion ceases?

Engine speed decreases. Signup and view all the answers

What condition does the governor go into when engine speed decreases?

Underspeed condition. Signup and view all the answers

What happens to the multiplying linkage when burner pressure decreases?

The multiplying linkage closes the metering valve. Signup and view all the answers

What is the initial condition of the high pressure fuel shut-off valve in the flow control FCU during pre-start?

closed Signup and view all the answers

What is the position of the power lever in the flow control FCU during pre-start?

idle Signup and view all the answers

In what condition is the governor speeder spring during pre-start?

expanded Signup and view all the answers

What is the initial condition of the differential pressure regulating valve in the flow control FCU during pre-start?

closed Signup and view all the answers

What holds the metering valve off the minimum flow stop in the flow control FCU during pre-start?

balanced spring pressures of the governor and main metering valve Signup and view all the answers

How does the deceleration bellows control the rate of deceleration in an engine?

The deceleration bellows ensures smooth deceleration without the risk of lean flameout by controlling the rate of fuel flow. Signup and view all the answers

Explain how bi-metallic disks are utilized in hydro-mechanical FCUs to sense inlet duct air temperature.

Bi-metallic disks sense inlet duct air temperature to control a metering device affecting pressures Px and Py values. Signup and view all the answers

What role do speed governors play in regulating fuel flow in a hydro-mechanical FCU?

Speed governors in a hydro-mechanical FCU help control the RPM by adjusting the fuel flow rate. Signup and view all the answers

How does a flow control FCU manage excess fuel in the fuel pump system?

A flow control FCU regulates fuel by bypassing excess fuel back to the inlet side of the engine fuel pump. Signup and view all the answers

Explain the significance of preventing excessive turbine temperature in an engine.

Preventing excessive turbine temperature helps avoid issues like compressor stall or surge in the engine. Signup and view all the answers