AMT 266 final

What are the engine speeds that are adjusted during an engine trim that has a Hydro-mechanical Fuel Control?

Idle and Part power

Which of the following is a function of the differential pressure controller?

It controls all positions of the waste gate except at fully open position.

Which of the following statements regarding volumetric efficiency of an engine is true?

It is possible to exceed 100 percent volumetric efficiency of some engines by the use of superchargers of the proper type

What is a characteristic of a centrifugal-type fuel boost pump?

It separates air and vapor from the fuel.

What is the purpose of the density controller in a turbocharger system?

Limits the maximum manifold pressure that can be produced by the turbocharger at full throttle.

What is MAP

Manifold Absolute Pressure

Which of the following turbine fuel filters has the greatest filtering action of any present day filter type?

Micron filter.

An engine that is normally aspirated will have a

No forced induction

Under which of the following conditions will the trimming of a turbine engine be most accurate?

No wind and low moisture.

Where physical separation of the fuel lines from electrical wiring or conduit is impracticable, locate the fuel line

below the wiring and clamp the line securely to the airframe structure.

The most satisfactory extinguishing agent for a tailpipe or intake fire is

carbon dioxide.

In a supervisory EEC system, any fault in the EEC that adversely affects engine operation

causes an immediate reversion to control by the hydromechanical fuel control unit.

On supersonic aircraft a normal inlet duct is a?

convergent-divergent duct

The purpose of a sonic venturi on a turbocharged engine is to

limit the amount of air that can flow from the turbocharger into the cabin for pressurization.

What directly regulates the speed of a turbocharger?

Waste gate.

Fuel pump relief valves designed to compensate for atmospheric pressure variations are known as

balanced-type relief valves

What indications may shift when a turbofan engine anti-icing (bleed air) system is turned on? 1. Tachometer. 2. EGT. 3. EPR.

1, 2, and 3

What are the three basic regulating components of a sea-level boosted turbocharger system? 1- Exhaust bypass assembly. 2- Compressor assembly. 3- Pump and bearing casing. 4- Density controller. 5- Differential pressure controller.

1, 4, 5.

Which of the following variables affect the inlet air density of a turbine engine? Slide 10 ?????? 1- Speed of the aircraft. 2- Compression ratio. 3- Turbine inlet temperature. 4- Altitude of the aircraft. 5- Ambient temperature. 6- Turbine and compressor efficiency.

1, 4, 5.

What four Disadvantages of fuel injection?

1. Costly 2. Poor Hot weather starts 3. Vapor lock 4. Clogged injectors

What are the four basic Components Teledyne Continental System?

1. Engine driven injection pump 2. Fuel/Air control unit 3. Fuel Manifold valve 4. Injector nozzles

What are five Advantages of fuel injection over carburetor?

1. Freedom from vaporization icing 2. Improved control of F/A mixture Increased engine efficiency 3. Reduction of Maintenance problems 4. Eliminates the need for carb heat except under severe atmospheric conditions 5. Instant acceleration of engine after idling, with no tendency to stall

In a Bendix RSA System what supplies the correct amount of fuel to the engine?

1. Fuel Regulator

What are the four components of a Bendix RSA System Fuel Metering Unit?

1. Fuel Strainer 2. Mixture control 3. Idle valve 4. Main and enrichment metering jets

What are the two position of the Mixture Control Valve of a Bendix RSA System?

1. Rich positions 2. Lean positions

What are the five main components of a Bendix RSA System?

1. Venturi Housing 2. Fuel metering unit 3. Fuel regulator 4. Flow divider 5. Fuel nozzles, one per cylinder

How many different channels does a FADEC fuel control have

2

Boost manifold pressure is generally considered to be any manifold pressure above

30 inches Hg.

What causes the fuel divider valve to open in a turbine engine duplex fuel nozzle?

Fuel pressure.

What should be checked/changed to ensure the validity of a turbine engine performance check if an alternate fuel is to be used?

Fuel specific gravity setting.

Teledyne Continental System what is mounted on the engines intake manifold in the same way a carburetor is normally mounted?

Fuel/air control unit

What is used to drive a supercharger?

Gear train from the crankshaft.

What are the engine speeds that are adjusted during an engine trim that has an Electronic Engine Control (FADEC)

Requires no engine trimming

If one FADEC channel fails in flight the engine will

Revert to the other channel

Where should the main fuel strainer be located in the aircraft fuel system?

At the lowest point in the fuel system.

Bendix RSA System what adjusts F/ A ratio to compensate for the decreased air density as the aircraft climbs to altitude?

Automatic mixture control

How much more air is required for a turbojet then that of a piston engine of similar size?

6-10 times

Where is the engine fuel shutoff valve usually located?

Aft of the firewall.

An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbosupercharged aircraft engine is known as

Bootstrapping.

How do the turbines which are driven by the exhaust gases of a turbo-compound engine contribute to total engine power output?

By driving the crankshaft through suitable couplings.

What is the purpose of a turbocharger system for a small reciprocating aircraft engine?

Compresses air to maintain manifold pressure constant from sea level to the critical altitude of the engine.

What two Fuel control inputs should you remember from this class

Compressor discharge pressure and Burner pressure

What is the name of the fuel injection system that Fuel is injected and mixed with air in each intake port just behind the intake valve?

Continuous-flow fuel injection system

What is the purpose of the flow divider in a turbine engine duplex fuel nozzle?

Creates the primary and secondary fuel supplies.

To what altitude will a turbocharged engine maintain sea level pressure?

Critical altitude.

What is the name of the fuel injection system that Fuel is injected directly into the cylinders?

Direct fuel injection system

What are the principal advantages of the duplex fuel nozzle used in many turbine engines?

Provides better atomization and uniform flow pattern.

What method(s) is/are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle (sand and ice) separators installed?

Sharp airflow directional change to take advantage of inertia and/or centrifugal force, and filters or engine inlet screens.

Which of the following statements concerning a centrifugal-type fuel boost pump located in a fuel supply tank is NOT true?

The centrifugal-type pump is classified as a positive displacement pump.

What is the purpose of the fuel transfer ejectors?

To assist in the transfer of fuel from the main tank to the boost pump sump.

For what primary purpose is a turbine engine fuel control unit trimmed?

To obtain maximum thrust output when desired

A _____________________ is capable of boosting manifold pressure above 30 in/Hg driven by exhaust gases

TurboSupercharger

A _____________________ is capable of boosting manifold pressure to 30 in/Hg driven by exhaust gases.

Turbocharger

What should be done initially if a turbine engine catches fire when starting?

Turn off the fuel and continue engine rotation with the starter.

Vortex dissipator systems are generally activated by

a landing gear switch.

A pilot reports that the fuel pressure fluctuates and exceeds the upper limits whenever the throttle is advanced. The most likely cause of the trouble is

a sticking fuel pump relief valve.

The vortex dissipators installed on some turbine-powered aircraft to prevent engine FOD utilize

a stream of engine bleed air blown toward the ground ahead of the engine.

Bootstrapping of a turbocharged engine is indicated by

a transient increase in engine power.

A supervisory electronic engine control (EEC) is a system that receives engine operating information and

adjusts a standard hydromechanical fuel control unit to obtain the most effective engine operation.

The purpose of an intercooler when used with a turbocharger is to cool the

air entering the carburetor from the turbocharger

If the turbocharger waste gate is completely closed,

all the exhaust gases are directed through the turbine.

As manifold pressure increases in a reciprocating engine, the

density of air in the cylinder increases.

A full-authority electronic engine control (EEC) is a system that receives all the necessary data for engine operation and

develops the commands to various actuators to control engine parameters.

On subsonic multi-engine aircraft a normal inlet duct is a?

divergent duct

The active clearance control (ACC) portion of an EEC system aids turbine engine efficiency by

ensuring turbine blade to engine case clearances are kept to a minimum by controlling case temperatures.

An aircraft should be facing into the wind when trimming an engine. However, if the velocity of the wind blowing into the intake is excessive, it is likely to cause a

false high compression and turbine discharge pressure, and a subsequent low trim.

Teledyne Continental System what evenly distributes fuel to all cylinders?

fuel manifold valve

The generally acceptable way to obtain accurate on-site temperature prior to performing engine trimming is to

hang a thermometer in the shade of the nose wheel-well until the temperature reading stabilizes.

In order to stabilize cams, springs, and linkages within the fuel control, manufacturers generally recommend that all final turbine engine trim adjustments be made in the

increase direction.

The fuel pump relief valve directs excess fuel to the

inlet side of the fuel pump.

Kerosene is used as turbine engine fuel because

kerosene has more heat energy per gallon and lubricates fuel system components.

An unsupercharged aircraft reciprocating engine, operated at full throttle from sea level, to 10,000 feet, provided the RPM is unchanged, will

lose power due to the reduced density of the air drawn into the cylinders.

Fuel crossfeed systems are used in aircraft to

maintain aircraft stability.

The purpose of a bellmouth compressor inlet is to

maximize the aerodynamic efficiency of the inlet.

Prior to performing engine trimming, you should

obtain a true temperature reading comparable to that of the air that enters the engine.

When an engine with a subsonic divergent type inlet duct is running in place at high speed on the ground, the air pressure within the inlet is

positive.

It is necessary to control acceleration and deceleration rates in turbine engines in order to

prevent blowout or die-out.

The purpose of an engine/inlet anti-ice system is primarily to

prevent ice formation in engine and/or inlet areas.

It is desirable that fuel lines have a gentle slope upward or downward and not have sharp curves or sharp rises and/or falls in order to

prevent vapor lock.

Boost pumps in a fuel system

provide a positive flow of fuel to the engine pump.

convergent-divergent duct

ram effect

The differential pressure controller in a turbocharger system

reduces bootstrapping during part-throttle operation.

When trimming a turbine engine, the fuel control is adjusted to

set idle RPM and maximum speed or EPR

The primary condition(s) that allow(s) microorganisms to grow in the fuel in aircraft fuel tanks is (are)

the presence of water.

Generally, the practice when trimming an engine is to

turn all accessory bleed air off.

The absolute pressure controller on some small engines is designed to sense oil pressure which flows through the waste gate actuator and then through the controllers on the turbocharger system; the pressure between the turbocharger and the throttle valve is called

upper deck pressure.

The pressure between the turbocharger and the throttle valve is called

upper deck pressure.

Fuel lines are kept away from sources of heat, and sharp bends and steep rises are avoided to reduce the possibility of

vapor lock.