Flowmeter Output and HP Fuel Filter Quiz

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What is the primary function of the engine fuel system?

To maintain a steady running state and ensure smooth maximum rate accelerations (correct)

To regulate the air delivery to the compressor for smooth engine acceleration

To limit the fuel flow to avoid unstable compressor airflow and engine surge

To deliver clean, ice-free fuel to the engine as requested by the flight crew

What is represented by the normal running line in the fuel system?

The back pressure caused by the increase in fuel flow

The maximum rate of accelerations without surging

The fuel requirement for a given rpm (correct)

The decrease in available energy causing engine deceleration

What effect does an increase in fuel flow initially have on the engine?

It decreases the energy available to the turbines, causing a decrease in engine speed

It results in a rapid deceleration of the engine

It causes the engine to stabilize at the steady state demand line

It restricts compressor air delivery, leading to unstable airflow and engine surge (correct)

What must be maintained to avoid flameout in the engine?

Sufficient fuel flow Signup and view all the answers

What happens when the available energy in the gas stream decreases?

The engine decelerates Signup and view all the answers

What is the metering requirement of the fuel system related to?

Pumping and metering clean, ice-free fuel to the engine in accordance with EEC demands Signup and view all the answers

What is the function of the Fuel Metering Unit (FMU)?

To convert electrical signals to servo pressures Signup and view all the answers

At what point is the Fuel Flow Transmitter reading inaccurate?

At fuel flows lower than 500 pph Signup and view all the answers

What occurs when the COSS control circuit commands the fuel switch to the 'OFF' position?

The PRSOV is forced to close Signup and view all the answers

How is deceleration achieved in the FMU operation during engine running?

By increasing the pressure drop across the FMV Signup and view all the answers

What is the purpose of the differential pressure transducer signals supplied to the EEC (channel A)?

To provide indication of engine health monitoring Signup and view all the answers

What happens when the aircraft fuel control switch is in the 'ON' position during engine running?

The EEC command increases fuel flow, directing HP servo fuel to the FMV bottom piston Signup and view all the answers

What is the purpose of controlling fuel spill in the HP pump?

To minimize fuel spill at engine start point Signup and view all the answers

What is the function of the LP fuel filter differential pressure transducer?

To measure the differential pressure across the LP fuel filter Signup and view all the answers

What is the main purpose of the LP fuel filter assembly?

To remove debris from the fuel prior to entering the HP pump Signup and view all the answers

What does the LP fuel DP transducer do when the differential pressure rises above the first EEC-predetermined threshold?

Displays a maintenance message in the cockpit Signup and view all the answers

What are the two functions of the LP fuel DP transducer?

Measurement of absolute pressure and measurement of differential pressure Signup and view all the answers

What is the purpose of the Fuel Return To Tank (FRTT) differential pressure transducer?

To convert measurements into electrical signals for EEC Signup and view all the answers

What is the purpose of the HP Fuel Filter?

To prevent adverse engine effects from unfiltered fuel in case of LP Fuel Filter bypass valve opening Signup and view all the answers

What is the filtration rating of the filter element in the HP Fuel Filter?

250 micron Signup and view all the answers

What is the purpose of the Fuel Temperature Transducer?

To provide an electrical signal representative of the fuel delivery temperature at the FCOC fuel outlet Signup and view all the answers

What is the function of the Overspeed and Splitter Unit (OSU)?

To divide the engine metered fuel flow equally between the upper and lower burner manifold Signup and view all the answers

What is the purpose of the upper and lower fuel manifolds?

To distribute fuel to 20 fuel nozzles on the upper and lower halves of the engine Signup and view all the answers

What occurs when the splitter valve in the Overspeed and Splitter Unit (OSU) is in the closed position?

A groove around the piston allows the upper manifold to drain into the lower manifold Signup and view all the answers

Which component of the fuel spray nozzles is responsible for atomizing the fuel for efficient combustion?

The fuel orifice Signup and view all the answers

What happens to the fuel in the fuel burner nozzles and manifold during engine shutdown?

It is collected in the drains tank due to back pressure in the combustor chamber Signup and view all the answers

Which display window presentation provides digital readings of engine fuel flow and indicates the difference in fuel flow between the two engines?

Fuelsynoptic 213 window Signup and view all the answers

What CAS message is associated with LP Pump outlet indicating insufficient fuel pressure for the HP fuel system?

Low fuel pressure detected Signup and view all the answers

What condition causes the FRTT (Fuel Return To Tank) system to cease operation?

Pulling of either FIRE handle Signup and view all the answers

What does the High Pressure Shutoff Valve (HPSOV) do when FUEL CONTROL switch selection is OFF?

Remains closed Signup and view all the answers

What is the purpose of alternating the ignition systems for each ground start sequence?

To ensure equal usage of igniter plugs and to detect dormant faults Signup and view all the answers

What triggers both of the ignition systems on the ground?

A failure to ignite indicating a failed ignition system Signup and view all the answers

What is the purpose of energizing both ignition systems in case of water ingestion or surge in stall detection?

To increase the likelihood of a successful lightoff Signup and view all the answers

What detects electrical faults in the Electronic Engine Controller (EEC)?

Internal voltage and current monitors Signup and view all the answers

What is the purpose of the Input Electromagnetic Interference (EMI) Filter in the ignition unit?

To filter out high-frequency elements and prevent contamination of the aircraft DC power supply Signup and view all the answers

What is the function of the Power Control Section in the ignition unit?

To change DC input voltage into a pulsating voltage that is then supplied to the discharge section Signup and view all the answers

What are the components of the Ignition System?

High Energy Ignition Units, High Temperature Ignition Leads, and Igniter Plugs Signup and view all the answers

What is the role of Z diodes in the ignition unit?

To protect the unit from overvoltage and voltage transients Signup and view all the answers

What causes ignition of the fuel-air mixture in the combustion chamber?

Igniter Plugs Signup and view all the answers

What is contained in a sealed case to protect it from damage and moisture?

Ignition Unit Signup and view all the answers