_202 - Propulsion Systems Fundamentals

Front 1

What is the function of the engine power section?

Back 1

consists of an axial-flow compressor, a combustion chamber, a multi-stage turbine, and an exhaust section. The last two stages of the turbine are used to drive the propeller using the torque- meter assembly and the reduction gearbox assembly.

Front 2

What is the function of the engine torque meter?

Back 2

electronically measures the torsional deflection (twist). Torsional deflection occurs in the power-transmitting shaft that connects the power section to the reduction gear assembly. This torsional deflection is recorded as horsepower.

Front 3

What is the function of the engine reduction gear system?

Back 3

reduces the engine rpm within the range of efficient propeller rpm.

The ratio on some installations is as high as 12 to 13 to 1.

Front 4

What is the function of the propeller blades?

Back 4

The four blades Hamilton standard (54H60-77) propeller provides an efficient and flexible means of converging engines SHP to thrust.

Front 5

What does the propeller consist of?

Back 5

propeller consists of two principle sections: the rotating section comprises the blades, hub, spinner and the dome that houses the pitch changing mechanism; the nonrotating section contains an oil resevoir, pressure and scavenger pump, the governor, and control mechanism.

Front 6

What is the function of the APU?

Back 6

The APU is what makes the P-3 a self-sustaining aircraft. The APU is made up of a turbine compressor driving a generator that is identical to the engine driven generators.

Front 7

What is the function of the fuel cells?

Back 7

Four integral wing tanks and an auxiliary tank carry the fuel supply for the engines.

Front 8

What consists of a bladder-type fuselage tank connected to an integral center section tank?

Back 8

The aux tank, (#5)

Front 9

What is the functionof the vents?

Back 9

float-type vent valves prevents over pressurization and overflow

Front 10

Where are the vents located?

Back 10

one in each wing tank and one in each cell of tank #5

Front 11

What is the function of fuel boost pumps?

Back 11

the bladder cell is equipped fuel boost pumps consisting of a scavenger section and boost section. The scavenger section routes fuel into a surge box while the boost section pumps fuel from the surge box to the engine driven pumps. In addition, they supply fuel flow cross feeding.

Front 12

What is the function of fuel transfer pumps?

Back 12

the bladder cell is equipped with two transfer pumps. Each pump consists of a scavenger section and a boost section. The boost section pumps fuel from the fuselage cell to any or all wing tanks. The scavenger section pumps fuel to the fuselage cell from the bottom of the center section tank.

Front 13

What is the function of explosion suppresant foam?

Back 13

a fully reticulated fire screen designed to prevent fuel tank explosions caused by tracers or high explosive incendiary rounds, thereby igniting oxygen rich fuel vapors

Front 14

What is the function of control panels?

Back 14

control center for fueling and de-fueling.
The panel enables the pressure fueling valves to be checked before fueling begins. Service light on the fueling control panel will illuminate whenever the fueling panel service door is opened.

Front 15

How do the following components work together to achieve the system's function:
Power Section

Back 15

consists of a 14stage axial flow compressor; six cylindrical combustion liners that comprise the combustion section; a 4stage turbine section, an accessory drive unit; an oil system; and a fuel control unit.

Front 16

How do the following components work together to achieve the system's function:
Torque meter

Back 16

the struts and the torque meter housing rigidly connect the reduction gear and the power unit. The torque meter transmits torque from the power until to the reduction gear assembly and provides an accurate means of measuring this torque. The torque meter housing is also the primary support structure between the power and the reduction gearbox.

Front 17

How do the following components work together to achieve the system's function:
Reduction Gear System

Back 17

reduces the high RP, low torque output of the power section to a low RPM, high torque output to be utilized by the propeller shaft. The reduction gearbox consists of two stages of reduction to avoid excessive gearbox size. The first stage (spur gear) has a ratio of 3.125:1; the second stage (planetary type) has a reduction ratio of 4.333:1. This results in an overall reduction of 13.54:1.

Front 18

How do the following components work together to achieve the system's function:
Propeller

Back 18

How do the following components work together to achieve the system's function:

Front 19

How do the following components work together to achieve the system's function:
Fuel Cells/Tanks

Back 19

Four integral wing tanks and an auxiliary tank carry the fuel supply to the engines.

Front 20

How do the following components work together to achieve the system's function:
Vents

Back 20

the tanks are vented by float-type vent valves, located one in each wing tank and one in the cell of tank #5, that prevents over-pressurization and overflow

Front 21

How do the following components work together to achieve the system's function:
Pumps

Back 21

each wing tank is equipped with a fuel boost pump consisting of a scavenge section and a boost section. The scavenge section discharges into a surge box while the boost pump fuel from the surge box to the engine-driven pump. In addition, they supply fuel for cross feeding. Normal boost pump pressure is 15 to 30 PSI

Front 22

How do the following components work together to achieve the system's function:
Control Panel

Back 22

the control center for fueling and de-fueling.

Front 23

What is the P-3C total fuel capacity in U.S. gallons?

Back 23

9,200 gallons total


JP-4 = 59,800 LBS @ 6.5


JP-5 =62,500 LBS @ 6.8


JP-8 = 61,640 LBS @ 6.7

Front 24

How does the ambient air temperature influence the operation of the fuel system?

Back 24

Fuel quantity indication can vary even though the aircraft is serviced with the same number of gallons of fuel. The factors that cause weight t change constant quantity are temperature and fuel density tolerances.

Front 25

How does the fuel system interface with propulsion?

Back 25

each of the four wing tanks can supply fuel to its respective engine or fuel can be supplied from any tank to any engine through a cross feed system.

Front 26

How does the fuel system interface with hydraulic system?

Back 26

the #2 and #3 fuel tanks provide a mean of cooling for hydraulic pumps. Minimum of 1,000 lbs of fuel is required in each tank to provide adequate hydraulic cooling.

Front 27

What safety precautions must be observed during fueling operations?

Back 27

Any RF transmission is a potential source of fuel ignition.
Allowing at least 3 minutes following re-fueling before using the dipstick. Failure to do so may result in static discharge.
To prevent structural damage, verify positive fuel tank venting and ensure that fueling pressure does not exceed 55 PSI. The pressure gauge for tank #5 must be closely monitored during fueling to prevent tank over-pressurization.