T-6A Propulsion 2 SY104

Question 1

What is the Engine Data Manager (EDM)

Answer 1

The Engine Data Manager is a computer unit located in the left avionics bay that monitors and processes engine operation data.

Question 2

What are the five main engine related tasks that the EDM provides?

Answer 2

The EDM drives the primary, alternate, and engine/systems displays and illuminates advisory, caution, or warning annunciators

Question 3

What are the eight non-engine related tasks that the EDM provides?

Answer 3

Provides fuel balancing, fuel quantity indications, activation of the nose wheel steering annunciator, a display of DC volts, DC amps, hydraulic pressure, cockpit pressure altitude, and pressure differential.

Question 4

How does the EDM receive power and where is that power located?

Answer 4

Redundant power is supplied to the EDM through circuit breakers, labeled EDM, located on the battery bus circuit breaker and the generator bus circuit breaker panel in the front cockpit only

Question 5

What and Where is the Primary engine data display (PEDD) located?

Answer 5

is an electronic instrument display (EID) that presents engine information received from the EDM. It is located on the right side of the instrument panel in each cockpit.

Question 6

What is the purpose of the primary engine data display (PEDD)?

Answer 6

Provides each cockpit with a visual indication of engine operation.

Question 7

Describe the pathway for the PEDD

Answer 7

All primary engine data is gathered by various sensors and is transmitted to the PMU for processing. The EDM monitors engine parameters and passes the information to the PEDD.

Question 8

What do the colors White/green, Amber and red mean on the PEDD

Answer 8

Normal operating range is White/Green
Caution Operating range is Amber
Exceeding operating limits is Red

Question 9

What Display information is on the PEDD?

Answer 9

Provides information on Torque, Interstage Turbine Temperature (ITT), Gas generator speed (N1), Propeller RPM (Np), and Indicated Outside Air temperature (IOAT)

Question 10

What is the Torque and how is it scaled on the PEDD?

Answer 10

Torque is the measured by the phase shift torque probe located in the reduction gearbox and represents a percentage of maximum rated torque. Scaled from 0-100%, out of scale readings are represented by greater than 100%

Question 11

What does the Interstage turbine temperature (ITT) represent and how is the data gathered?

Answer 11

The ITT provides the pilot with an indication of the temperature between the compressor turbine and the power turbine. The data gathered from a sensing system around the combustion chamber.

Question 12

How is the ITT displayed on the PEDD?

Answer 12

Displayed in degrees Celsius

Question 13

What is the operating limits of the ITT during the starting sequence?

Answer 13

400-1000 degrees Celcius

Question 14

What are the operating limits of the ITT after the startup sequence is complete.

Answer 14

400-820 degrees Celcius

Question 15

What is the Gas generator speed and how does it get its reading?

Answer 15

(N1) it represents the speed of the compressor turbine in the gas generator section of the engine and is sensed by a magnetic pulse sensor in the accessory gear box

Question 16

Whats the normal operating limits of N1?

Answer 16

60-104%

Question 17

How is the Propeller RPM (Np) measured?

Answer 17

Measured by a torque probe and represents a percentage of the maximum rated propeller RPM

Question 18

What is the ground operating limits and out of limit readings of Np?

Answer 18

0-61%, and 81-100%, in order to prevent damage from ground resonance, sustained propeller operating between 62-80%, Np is prohibited while on the ground. Out of limit readings is more than 102%

Question 19

How is the Indicated Outside air temperature (IOAT) measured and where is it located?

Answer 19

Measure by a T-1 probe, a sensor located in the inlet plenum

Question 20

What is the purpose of the Alternate engine data display (AEDD)?

Answer 20

Provides each cockpit with a visual indication of engine operations

Question 21

Describe the AEDD operating principles

Answer 21

provides some of the same information as the PEDD, but is not processed by the PMU. Torque is first determines by the PMU and then sent to the EDM for display

Question 22

Identify the AEDD system components

Answer 22

Raw interstage Turbine Temperature (RITT), Torque, Gas generator speed (N1), Cockpit Pressure Altitude, Cockpit differential pressure (Delta P), Fuel Flow, and Fuel Quantity

Question 23

What does the Cockpit Pressure altitude do?

Answer 23

Provides pilot with the altitude maintained in the cockpit due to pressurization. Illuminated to yellow after FL 19.

Question 24

What does the Cockpit differential pressure do?

Answer 24

Measure the difference between the air pressures inside and outside the cockpit. If it exceeds 3.9 to 4.0 then it is outlined in red

Question 25

How is the AEDD powered?

Answer 25

Powered though a circuit breaker located on the battery bus circuit breaker panel in each cockpit

Question 26

Identify the purpose of the engines/systems display (ESD)

Answer 26

Display provides Oil temperature, oil pressure, hydraulic pressure, DC voltage, and DC amperage.

Question 27

How is oil temperature measured ?

Answer 27

Measured by a transducer on the engine oil pressure line downstream of the main oil pump.

Question 28

What is the normal, cautionary and out of limits range for oil temperature

Answer 28

Normal range is from 10-105 degrees celsius, cautionary range is from 105-110, and out of limits is above 110

Question 29

How is Oil pressure measured?

Answer 29

measured by a transducer located on on engine oil pressure line.

Question 30

What is the normal operating limits for oil pressure?

Answer 30

90-120 PSI

Question 31

How is hydraulic pressure measured?

Answer 31

measured by a pressure sensor located on the power pack reservoir.

Question 32

What is the normal and cautionary limits for the hydraulic system?

Answer 32

normal range is from 2880-3120 PSI, cautionary range (amber) is below 1800 and above 3500 PSI

Question 33

How is DC voltage measured?

Answer 33

Monitored and controlled by the generator control unit, which also serves as a voltage regulator.

Question 34

What is the white, amber, and red operating limits of DC voltage?

Answer 34

White range is from 22.0-29.5V, amber is 29.6 to 32.2 or under 21.9. Red is 32.3 and above

Question 35

How is the ESD power provided?

Answer 35

ESD is provided through a circuit breaker on the generator bus circuit.

Question 36

Identify the purpose of the engine fire warning system

Answer 36

The system is designed to monitor both average and discrete temperatures.

Question 37

What does the fire Warning system consist of?

Answer 37

Core element, sensor tube, and a responder assembly.

Question 38

How does the fire warning system operate?

Answer 38

The sensor tube is filled with helium gas and inside that tube is a core element filled with hydrogen gas. The core element responds to the heat cause by fire and hot gases.

Question 39

True/False: The fire warning systems reliability diminishes if there is kinks, twists, or dents in the tubing

Answer 39

False

Question 40

What does the fire warning operation 1 do?

Answer 40

As the heat rises, the helium expands and creates pressure, and when the pressure exceeds the limit, a signal triggers the fire alarm

Question 41

What does the fire warning operation 2 do?

Answer 41

The hydrogen core will release gas as the temperature rises into the sensor tube, the mixture between the hydrogen and helium will increase pressure and when the pressure limit is exceeded, it generates a overheat warning

Question 42

What warning indications will appear if there is a fire?

Answer 42

The red fire and the master warn will illuminate. Also a warning tone will start.

Question 43

What does the Firewall shutoff handle do?

Answer 43

It mechanically shuts off the hydraulic and fuel flow to the engine and well as bleed air flow from the engine. May be reset by pushing the handle back in.

Question 44

Where are the two Fire warning systems located for power?

Answer 44

Located on the circuit breaker in the front cockpit