T56 Engine

Front 1

"An unbalanced force on a body produces or tends to produce an acceleration in the direction of the force and that the acceleration, if any, is directly proportional to the force and inversely proportional to the mass of the body." This statement is:

Back 1

Newton's second law of
motion

Front 2

Which law may you sum up with two words: action and reaction?

Back 2

Newton's third law of motion

Front 3

Which type of duct would decrease the velocity and increase the pressure of a gas as it passes through?

Back 3

Divergent

Front 4

"The combination of decreased pressure above an airfoil, and the increased pressure below the airfoil produces lift" is best described by

Back 4

Bernoulli's principle

Front 5

The temperature of compressed air in a jet engine must be raised to

Back 5

Increase energy

Front 6

Which section of a jet engine keeps the compressor rotating?

Back 6

Turbine

Front 7

Through which section of a jet engine is energy expended into the atmosphere, resulting in thrust?

Back 7

Exhaust

Front 8

Which type of horsepower is delivered to the propeller for useful work?

Back 8

Brake

Front 9

What is the equation for calculating friction horsepower?

Back 9

Indicated horsepower minus brake horsepower

Front 10

Which type of horsepower determines the performance of the engine-propeller combination?

Back 10

Equivalent shaft

Front 11

Which instrument is used to measure atmospheric pressure?

Back 11

Barometer

Front 12

The standard atmospheric pressire is equal to

Back 12

14.7 psi

Front 13

The ratio of the amount of water vapor actually present in the atmosphere to the amount that would be present if the air were saturated at the prevailing temperature and pressure is the definition of

Back 13

relative humidity

Front 14

What is the overall reduction of the RGB's main reduction gear train?

Back 14

13.54:1

Front 15

Which compressor section assembly disperses compressor discharge air and directs it to the combustion chambers?

Back 15

Diffuser

Front 16

At the aft ends, what hold the combustion chambers (liners) in place?

Back 16

Turbine inlet vane assemblies

Front 17

During flight range operation, what maintains the T56 engine at a constant engine speed of 13,820?

Back 17

Propeller governing system

Front 18

To maintain propeller speed at 1020 rpm, how are overspeed and underspeed conditions controlled?

Back 18

Blade angle

Front 19

In the T56 engine engine, which RGB component rotates at the same speed as the power unit rotors?

Back 19

Pinion input gear

Front 20

Which two gears make up the first stage of reduction in the RGB?

Back 20

Pinion input and main drive

Front 21

When the engine is running above 23% rpm, the propeller brake is held in the released position by

Back 21

RGB system oil pressure

Front 22

The propeller brake is in which position when the aircraft is in the ground and the engine is stopped?

Back 22

Applied

Front 23

When the engine is operating below FLIGHT IDLE, the NTS system is

Back 23

mechanically locked out

Front 24

Which components comprise the torquemeter assembly?

Back 24

Two concentric shafts, torquemeter housing, and torquemeter pickup

Front 25

The amount of twisting deflection is determined by the

Back 25

reference shaft

Front 26

The torquemeter exciter wheels are in phase when

Back 26

the rectangular teeth on the exciter wheels are aligned at zero torque

Front 27

For the safety coupling to disconnect the power unit from the RGB, torque must reach between

Back 27

-4200 and -7200 inch pounds

Front 28

The torque shaft can recouple to the RGB, if torque decreases below approximately

Back 28

-6000 inch pounds

Front 29

Which shaft delivers the speed of the power unit to the accessory housing?

Back 29

Compressor extention

Front 30

Which shaft extends through the bottom vertical strut of the air inlet housing into the accessory drive housing?

Back 30

Accessory main drive

Front 31

After air is drawn into the guide vanes of a centrifugal compressor, it is subjected to

Back 31

rotational and centrifugal forces

Front 32

The cheapest type of compressor to manufacture is the

Back 32

centrifugal, because of its simplicity

Front 33

The purpose of the annular passageways in the air inlet housing is to allow

Back 33

anti icing air and pressurized oil to pass to the compressor assembly

Front 34

the stationary (stator) vane blades on the T56 compressor are used to

Back 34

increase pressure

Front 35

What type of bearings support the T56 compressor rotor at the front and rear?

Back 35

Front, roller; rear, ball

Front 36

Which T56 compressor component supports the compressor rear bearing labyrinth seal?

Back 36

compressor diffuser

Front 37

Combustion section design has helped prevent igniter plug fouling by

Back 37

directing air around the plug.

Front 38

Carbon monoxide gas is

Back 38

colorless

Front 39

After engine shutdown, fuel that accumulates in the T56 engine combustion section is

Back 39

vented overboard by drain valves

Front 40

In the T56 engine, turbine rotor torque is transferred to the compressor rotor by the

Back 40

turbine coupling shaft

Front 41

In a gas turbine engine, which type of turbine is normally used?

Back 41

Impulse-reaction

Front 42

The fir tree methof of turbine bucket attachment is

Back 42

a series of grooves or notches broached in the rim of the turbine rotor disk.

Front 43

The fir tree method of turbine rotor blade attachment is preferred because it

Back 43

Allows for expansion of the turbine rotor disk.

Front 44

A turbine stage consists of a row of

Back 44

Stationary vanes followed by a row of rotor blades.

Front 45

The purpose of the turbine section is to convert

Back 45

energy into torque

Front 46

The purpose of the guide vane support is to direct airflow

Back 46

onto the turbine rotor blades

Front 47

What are used to retain the turbine buckets in the first-stage wheel of the T56-A-15 engine?

Back 47

Cover plate seals

Front 48

Which component functions as an on-off control for the air supply that is sent to the starter?

Back 48

Starter control valve

Front 49

The speed sensitive control lets electrical current flow to the fuel and ignition system at

Back 49

16% rpm

Front 50

At what percent of engine rpm is the ignition system turned off?

Back 50

65%

Front 51

Which type of oil pump is used on the T56 engine?

Back 51

Gear

Front 52

The amount of ram air passing through the oil cooler core is regulated by the

Back 52

flap actuator

Front 53

Bleed air flowing through which component increases airflow through the cooler?

Back 53

Augmentation ejector

Front 54

The valve that allows fluid to flow in only one direction is the

Back 54

check

Front 55

Which type of valve is normally incorporated in an oil filter assembly?

Back 55

bypass

Front 56

In the power unit oil system, which valve located in the main pump is used to bypass excess oil?

Back 56

pressure-regulating

Front 57

In the power unit oil system, the dual-port oil jet mounted on the front side of the compressor air inlet housing is used to lubricate the

Back 57

mid and center sleeve bearings

Front 58

Oil from the interior of the air inlet housing drains into the bottom of the

Back 58

accessory drive housing

Front 59

Which RGB component prevents oil in the tank from draining into the RGB rear case?

Back 59

Oil pump check valve

Front 60

Induvidual pressure relief valves in the RGB scavenge and pressure oil systems limit pressure to

Back 60

250 psi

Front 61

How many scavenge oil pumps are located in the RGB?

Back 61

2

Front 62

How many and what type of fuel pumps are contained in the fuel pump and filter assembly?

Back 62

2 gear, 1 boost

Front 63

What controls the rotary movement of the fuel control metering valve?

Back 63

Compressor inlet pressure

Front 64

Which component receives 120% of the engine fuel requirement?

Back 64

TD valve

Front 65

Which switch in the speed sencitive control actuates and energizes the fuel pump paralleling valve?

Back 65

16%

Front 66

The manifold pressure switch opens to deenergize the fuel enrichment relay when fuel pressure in the manifold reaches

Back 66

50 psi

Front 67

When there is a difference between the actual and the scheduled turbine inlet temperatures, the difference is corrected by

Back 67

Altering fuel flow

Front 68

When the null orifice on the TD valve is set to zero, how much fuel will the valve bypass?

Back 68

20%

Front 69

The rate of fuel flow to the engine is measured by the fuel

Back 69

flow meter

Front 70

The total range of each oil quantity indicator is 0 to

Back 70

12 US gallons

Front 71

The purpose of the oil temperature indicating system is to show the temperature of the engine oil

Back 71

before it is sent to the oil pressure system

Front 72

Thermocouple leads connect the thermocouples to the TIT indicating system and the

Back 72

TD amplifier

Front 73

In the fire warning system, which component contains the relay that illuminates the master fire warning light and the fire emergency handle lights?

Back 73

Control unit

Front 74

The temperature setting of the turbine overheat detectors is

Back 74

700 degrees fahrenheit

Front 75

How many overheat detectors are in the nacelle overheat system?

Back 75

6

Front 76

The component that allows 14th stage air to close the bleed air valves is the

Back 76

speed sensitive valve

Front 77

The anti icing air valve assemblies are mounted on the air inlet housing at the

Back 77

3 and 9 oclock positions

Front 78

The anti icing solenoid valve is

Back 78

normally open

Front 79

Before assembling engine bearings

Back 79

clean them

Front 80

During RGB removal with the propeller installed, which check must be performed prior to removing the propeller?

Back 80

Retaining nut torque

Front 81

If the RGB on No. 4 engine were replaced

Back 81

you must bleed the booster hydraulic systen

Front 82

Prior to installing the safety coupling, you must inspect the

Back 82

pinion gear input bushing

Front 83

The measurement used to properly install the turbine to compressor tie bolt is the turbine rotor

Back 83

front of vane clearance

Front 84

If a fuel nozzle is disassembled, you

Back 84

must replace it

Front 85

What instruction provides guidance concerning reflective materials and the use of maintenance stands and lifting devices?

Back 85

AFOSH Standard 91-100

Front 86

Of how many people does the minimum engine runup crew consist?

Back 86

3

Front 87

When a T56 engine is installed on the airfract, it must produce a minumum

Back 87

95% of its rated power

Front 88

Prior to conducting an engine performance run, what system is calibrated by performing a low speed gorund idle run?

Back 88

Torquemeter indicating

Front 89

The RGB oil system pressure is adjusted by turning the screw on the

Back 89

pressure adjusting valve

Front 90

The torquemeter indicator calibration check on a C-130 aircraft is performed with the engine running at

Back 90

low speed ground idle.