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Aerospace Propulsion > Electrical System > Flashcards

Electrical System Flashcards

1
Q

A/C Generator

A

Mounted on the aft side center of the engine’s accessory gearbox.

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2
Q

A/C Generator (works)

A

Consists of a rotor and Stator Housing. Rotor contains three sets of magnets. The stator contains three sets of stationary copper windings and houses the Rotor.
Magnets rotate when the gearbox turns. The magnets and Windings. These sets of magnets and windings create three independent power sources.

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3
Q

Digital Electronic Control (Dec)

A

Mounted on the outer fan duct at the 6:00 position aft of the fuel boost pump.

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4
Q

Digital Electronic Control (Dec) (Works)

A

It performs scheduling, limiting, and signal conditioning operations. Collects signals from sensors throughout the engine and determines parameters for optimal engine performance.

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5
Q

Fan Inlet Temperature (T2) Sensor

A

Mounted on front frame at 6:30 position, and protrudes into the air streams.

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6
Q

Fan Inlet Temperature (T2) Sensor (works)

A

Measures the temperature of air entering the engine.

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7
Q

Turbine Blade Temperature Sensor (T4B Pyrometer)

A

T4B is located on the lower outer fan duct at the 6:30 position and protrudes into the engine just behind the HPT blades.

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8
Q

Turbine Blade Temperature Sensor (T4B Pyrometer)

A

Measures HPT blade temp and provides an electrical signal to the DEC. The DEC receives this temp signal and uses the data to limit heat while achieving maximum performance of the engine.

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9
Q

Fan Speed Sensor

A

Located on the fan frame at approximately 8:00 position and protrudes into the mid sump directly behind the fan rotor.

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10
Q

Fan Speed Sensor (Works)

A

Generates an electrical signal, proportional to the fan Revolutions Per Minute (RPM). Consists of a magnetic pickup and bracket. As the fan rotates during engine operation, the pickup passes in the front of the magnet producing an electrical signal. The DEC receives this electrical signal and converts the frequency to which the pickup passes over the magnet to an input representing fan RPMs.

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11
Q

Exhaust Gas Temperature (T5.6) Thermocouple

A

Mounted to the augmenter duct at the 6:00 position.

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12
Q

Exhaust Gas Temperature (T5.6) Thermocouple (Works)

A

Consists of one chromel wire and one alumel wire welded together. Converts engine exhaust gas heat into an electrical signal. T.5 transmits a signal through the DEC to the cockpit indicator and has no direct control function.

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13
Q

Flame Sensor

A

Mounted on the outer surface of the exhaust nozzle duct at approximately 7:00 position.

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14
Q

Flame Sensor (Works)

A

Senses ultraviolet radiation. Transmits an electrical signal to the DEC showing the presence of a flame at the augmenter flame holder. Flame sensor sends a continuous signal for as long as the augmenter flame is present.

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15
Q

Electrical System Operation (Works)

A

A/C generator produces an electrical current. The current produced is used to power the DEC and ignition system. The T2 sensor, T4B pyrometer, Fan sensor and flame sensor send various electrical signals to the DEC. The T5.6 (EGT) thermocouple sends an electrical signal to the FTIT indicator in the cockpit. The DEC acquires and monitors engine parameters, executes system fault detection and isolation, as well as communicates with the airframe and ground support equipment (CETS)

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16
Q

FTIT

A

Fan Turbine Inlet Temperature

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17
Q

CETS

A

To be determined (Need to ask Sargeant Cantner)

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18
Q

What two Items comprise the fan speed sensor?

A

Consists of a magnetic pickup and bracket. As the fan rotates during engine operation, the pickup passes in the front of the magnet producing an electrical signal. The DEC receives this electrical signal and converts the frequency to which the pickup passes over the magnet to an input representing fan RPMs.

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19
Q

How many separate power sources are created by the A/C generator

A

Three independent power sources. (Power sources to be determined when I ask Sargeant Cantner)

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20
Q

Which sensor produces a signal used by the DEC to determine inlet Guide Vane positions?

A

Fan Inlet Temperature (T2). Measures total temperature of air at the fan inlet and sends an electrical signal to the DEC. The DEC uses a temp signal from the T2 sensors to determine the required position of the IGV.

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21
Q

Oil Tank

A

Located on the fan stator case between 4:00 and 5:00 positions.

22
Q

Oil Tank (Works)

A

Means to store oil for the lube and hydraulic systems. Contains an oil level and temperature switch. Provides oil de-aeration and air venting and has fill, overfill couplings and JOAP port connections for ground servicing. Features a three-gallon capacity with drain capability.

23
Q

JOAP

A

Joint Oil Analysis Program

24
Q

Lube and Scavenge Pump

A

Mounted on the left forward face of the gearbox. Provides mounting and drive for the hydraulic pump.

25
Q

Lube and Scavenge Pump (Works)

A

This oil pump supplies 7808 under pressure, to engine sumps. It scavenges oil from the oil sumps and gearbox in addition to providing filtration. Has ONE lube supply element and FIVE scavenge elements. Three scavenge elements for the oil sumps are (FORWARD, MID, AFT) Has TWO scavenge elements for the accessory gearbox (CLIMB and DRIVE).

26
Q

Lube Filter

A

The Lube filter is an integral part of the lube and scavenge pump.

27
Q

Lube Filter (Works)

A

Cleans oil by removing contaminants such as wear metals and pieces of seals. Lube filter is a full flow bypass type, meaning the filter housing incorporates a relief valve to allow continuous oil flow in the event of a clogged filter element; dirty oil is better than no oil. The filter bowl has an impending bypass indicator (Delta P or △P) to indicate a clogged filter and need for servicing. Filter element is disposable and a one-time use item. Equipped with a service shutoff valve minimizing oil loss during filter element replacement.

28
Q

Lube Nozzles

A

Lube nozzles may consist of tubes connected to manifolds or internal ports cast into gearbox casings and are located in the sumps and gearbox.

29
Q

Lube Nozzle (Works)

A

Lube Nozzles direct/spray engine oil onto areas such as bearings and gears to clean, cool, and lubricate.

30
Q

Magnetic Chip Detector (MCD)

A

Located between the lube & scavenge pump and fuel/oil cooler.

31
Q

Magnetic Chip Detector (MCD) (Works)

A

Inline Chip detectors are used to visually identify the presence of wear metals in the lube system. Any metal particles in the lube system will be picked up on the magnet.

32
Q

Fuel/Oil Cooler

A

Mounted on the lower outer bypass duct, aft of the Main Engine Control (MEC), at approximately the 7:00 position.

33
Q

Fuel/Oil Cooler (Works)

A

Reduces the temperature of the scavenge oil by transferring heat from the oil into the fuel. This heat transfer process heats fuel going to the combustion chamber for better atomization and aids the fuel nozzles in creating a fine mist. The fuel/oil cooler contains a cold oil bypass valve, which prevents excessive pressure differentials during cold engine starts.

34
Q

Oil Pressure Transmitter (OPT)

A

Located at about the 5:00 position aft of the oil tank.

35
Q

Oil Pressure Transmitter (OPT)

A

Compares direct pressure from the lube and scavenge pump and pressure that is vented through the engine accessory gearbox internal cavity. The OPT generates a signal that is based on how much pressure the pump is creating for the lube system versus how much pressure is being vented by the gearbox to generate a differential pressure. This pressure differential is then converted into an electrical signal by the OPT and a continuous oil pressure signal to the cockpit indicator.

36
Q

Main Lubrication System Operation

A

The oil tank stores and routes oil to the lube and scavenge pump. The Pump Filters, pressurizes and routes oil to the lube nozzles, which direct the oil onto the bearings, internal gears in the accessory gearbox, and oil seals. The oil is then scavenged by the five scavenge elements and directed through manifolds to the fuel/oil cooler before returning to the oil tank. The OPT senses gent and direct pressure, converts it to electrical signal and sends it to the cockpit indicator. The indicator displays engine oil pressure for the pilot or maintenance personnel to monitor.

37
Q

Auxiliary Lubrication and Sump Pressurization Operation

A

Core compressor, third stage, bleed air is used to pressurize the oil seals in the sumps. To prevent oil leakage, the pressurized air will cause the oil seals to expand the seal in the lubrication oil. The pressurized air in the sumps must vent to prevent the seals from blowing out. This process takes place through the de-aerator, where the air discharges into the exhaust gas streams through the aft center body.

38
Q

Lube system auxiliary supply subsystem

A

(Borrowed from hydraulic system) Provides a temporary supply to the no. 3 bearing in the vent normal oil flow failure. In the event of oil pressure loss, hydraulic system oil redirects to the number 3 bearing. The number 3 bearing supports the front of the core engine and is a crucial component to the overall functionality of the engine.

39
Q

What three connections are used for ground servicing on the oil tank?

A

Oil de-aeration and air venting, has fill/overfill couplings, and JOAP port connections for ground servicing.

40
Q

What is the Magnetic Chip Detector used for?

A

Visually, identify the presence of wear metals in the lube system. Any metal particles in the lube system will accumulate on the magnet.

41
Q

In the event of clogged oil filter, why would the oil bypass the filter entirely?

A

Lube filter is a full flow bypass type, meaning the filter housing incorporates a relief valve to allow continuous oil flow in the event of a clogged filter element.

42
Q

Fuel Boost Pump

A

The boost pump is flange mounted on the right aft face of the accessory gearbox

43
Q

Fuel Boost Pump (Works)

A

Increases fuel pressure for all engine power settings. It is a SINGLE element centrifugal type pump. The boost pump receives fuel from the aircraft’s fuel cells/tanks and provides initial fuel pressurization while routing fuel to both the main and augmenter fuel pumps.

44
Q

Main Fuel Pump (MFP) and Filter

A

The MFP is flange mounted on the left aft side of the engine accessory gearbox and provides shaft power to the MEC.

45
Q

Main Fuel Pump (MFP) and Filter (Works)

A

Provide filtered, pressurized fuel. The MFP is a dual element (two separate chambers) pump consisting of a centrifugal boost element and a high-pressure gear element. Fuel system filters are disposable, wire mesh design and their purpose is to remove any solid contaminants from the fuel system before combustion or servo use. In the event of a clogged filter, fuel will bypass the filter element because dirty fuel is better than no fuel.

46
Q

Main Engine Control (MEC)

A

MEC is flange mounted on the rear face of the main fuel pump.

47
Q

Main Engine Control (MEC) (Works)

A

Fuel operated, bypassing electro-hydro-mechanical fuel flow regulator. During primary mode, the MEC sets main fuel flow and the Variable Stator Vane position in response to a demand from the digital engine control (DEC). In secondary mode, the MEC schedules VSV position and governs core engine speed.

48
Q

Fuel/Oil Cooler (Fuel systems)

A

Fuel/oil cooler cools the scavenge oil before it returns to the oil tank. Simultaneously, cooler fuel passes in close proximity to the hotter oil, a heat exchange occurs, and the temp of fuel used for main engine combustion is increased. Heated fuel allows the fuel nozzles to atomize the fuel and supports a more efficient combustion process.

49
Q

Fan Discharge Temperature Sensors (T2.5)

A

The two T2.5 sensors mount on the FAN FRAME at 2:00 (upper T2.5) and 8:00 (lower T2.5) positions.

50
Q

Fan Discharge Temperature Sensors (T2.5)

A

Fan discharge air temperature. The two T2.5 sensors sit in the airflow path of the air coming out of the fan compressors. The MEC sends pressurized fuel to the T2.5 sensors where the sensor changes the fuel temperature and returns the fuel to the MEC. The MEC will translate the change in fuel temperature to represent discharge air temperature of the Fan and sends a signal to the DEC.

Aerospace Propulsion (1 decks)

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