turbine engine accessories

Turbine fuel cannot freeze until what temperature?

-40 Deg F

What is the principal advantage of the duplex fuel nozzle?

The spray pattern remains constant throughout all power settings

What two parameters are monitored by all fuel controls?

Compressor RPM and Throttle position

Turbine fuels are categorized into three types what are they?

Jet A, Jet A1, Jet B

What causes “Rich Blow Out?”

Too much Fuel, not enough air

When the power lever (throttle) is advanced, what happens?

It leans out as the RPM decreases

Supervisory EEC controls what?

Fuel Flow at high power setting.

What are the functions of pressurization and dump valves?

Builds fuel pressure and dumps fuel at engine shut down

Can you mix synthetic and mineral based oils?

NO, they are not compatible

What type of bearings are most common in turbine engines?

Non-Friction Bearings

What are the two main sections of a fuel control?

Metering and Computing

12. The scavenge pump capacity must be __________ as much as the pressure pump?

2x (double that of the pressure pump)

Oil consumption of a turbine engine is a function of?

Seals

What are boost pumps for?

Positive fuel flow to engine driven pump

Who provides the oil tank for a dry sump system?

airframe or engine manufacturer

The most common way to keep oil consumption to a minimum?

Pressurize the bearing compartments with compressor bleed air.

Abnormal smell or color of fuel can be caused by?

Microbial growth

What is the function of the fuel nozzle?

To atomize fuel

Paper filters are?

Replaced periodically

Chip detectors are located?

in the scavenge system

The accessory gearbox is driven by?

High pressure compressor or N2

In a labyrinth seal ________ acts as a sealing media.

Compressor Bleed air

In a hot tank system, where are the coolers located?

In the pressure system.

Where is the gearbox located on the engine?

the 6’o’clock position

________________ is a mixture of gasolene and kerosene.

JetB

What section of the fuel control uses various inputs to determine the weight of air passing through the engine?

computing section

___________ _______ require a separate system for starting.

Vaporizer Nozzle

The fuel nozzle that divides fuel flow in the nozzle is called what?

Duplex Single line

Most Common type of fuel control?

Hydro-Mechanical

What is the main purpose of the fuel heater?

Prevent ice from forming in the system by heating the fuel

When does secondary fuel flow come into play?

Added to the primary flow under high power settings

The EEC of a FADEC controls what?

Engine actuation from idle to full power

The main purpose of the inlet fuel pressure switch is what?

Indicates to the pilot if the boost pump is working

Why is kerosene used as turbine engine fuel?

Has high heat value and lubricates system components

Wet sump is the most common.

False

Jet B is the most common fuel for international flights.

False (Jet A1 is most common)

Only the FADEC has an EEC.

False

Fuel nozzles are part of the low pressure engine fuel system.

False

Fuel system in order:

1. Boost pump

2. Fuel Heater

3. Fuel Filter

4. Fuel pump

5. Fuel control

6. Pressurization and Dump Valve

7. Fuel Manifold

8. Nozzles