SYS104 - Propulsion 2 Flashcards
How is hydraulic pressure measured?
By a pressure sensor located on the power pack reservoir.
What is propeller RPM (Np) and how is it measured?
The percent of maximum propeller RPM. Measured by the torque probe in the reduction gearbox.
What information does the ESD provide?
The engine/systems display provides:
- Hydraulic Pressure
- Oil Temp
- Oil Pressure
- DC Voltage
- DC Amperage
What is the cause of this indication?
What information does the cockpit pressure altitude give you?
The pressure altitude maintained in the cockpit due to pressurization.
How does localized temperature trigger the fire response system?
As average or localized temperature increases, the helium in the sensor tube heats up and increases in pressure. Once this pressure surpasses the preset pressure limits in the responder, a signal triggers the overheat/fire alarm.
What engine related tasks does the EDM perform?
The EDM drives the primary, alternate, and engine/systems displays. The EDM illuminates advisory, caution, or warning annunciators
What two types of temperatures are measured by the fire detect system?
- Average
- Discrete
How does average temperature trigger the fire warning system?
As the average or local temeprature increases, the hydrogen in the core element increases, releasing hydrogen gas into the sensor tube. This hydrogen gas causes the helium gas pressure to increase. Once the pressure in the sensor tube surpasses the preset pressure limits for the responder, it signals the overheat/fire alarm.
What are the system operation principles for the AEDD?
Unlike the PEDD, the AEDD’s information (except torque) is not processed by the PMU. The AEDD provides each cockpit with a backup visual indication of engine operations.
What are the possible causes of an amber DC voltage readout on the ESD?
Either:
- 0 - 21.9 V
- 29.6 - 32.2 V
What is the cause of these indications?
The cockpit pressure altitude has exceeded 19,000 feet.
All of the AEDD’s information is processed by the PMU (T/F)?
False, torque is first determined by the PMU then is sent to the EDM
Unlike the PEDD and with the exception of _____, data for the AEDD is not processed b the PMU.
Torque
What does the Fire Shutoff Handle shut down and is it electric or mechanical?
It mechanically shuts off:
- Hydraulic Fluid
- Fuel Flow
- Bleed Air Flow
What information/operation does the EDM provide about cockpit pressure?
Cockpit pressure altitude and cockpit pressure differential
How is IOAT measured?
It is measured by the T-1 probe, a sensor located in the inlet plenum.
How is oil temperature measured?
By a transducer on the engine oil pressure line downstream of the main oil pump
What information/operation does the EDM provide about nosewheel steering?
Activation of the nosewheel steering annunciator
When various sensors gather all primary engine data, where is it sent to?
The information is sent to the PMU for processing.
What is the purpose of the engine fire warning system?
To notify the pilot of possible fire or overheat.
What is the normal operating range for the DC Voltage readout on the ESD?
22.0 - 29.5 V
What information is displayed on the AEDD?
- RITT
- Torque
- N1
- Cockpit Pressure Altitude
- Cockpit Pressure Difference
- Fuel Flow
- Fuel Quantity
What are the components of the engine fire warning system?
- Core element
- Sensor Tube
- Responder Assembly
How is the torque percentage value on the PEDD measured and what does it represent?
It is measured by the phase shift torque probe located in the reduction gearbox. It represents the percentage of maximum torque.
If preset temperature limitations are exceeded, what should you expect to see?
What is the difference between RITT and ITT?
RITT’s information is sensor data that is sent directly to the display without processing.
When testing each of the fire warning systems what switch do you flip and what do you expect to see?
The Fire switch on the system test panel in the FCP.
The PEDD’s information is processed by the PMU (T/F)?
True
What is N_1?
Also known as gas generator speed. N1 is the speed of the compressor turbine and is measured by a magnetic pulse sensor in the accessory gearbox.
`What information/operation does the EDM provide about the hydraulic system?
It displays hydraulic pressure
The valves closed off when activating the fire shutoff handle can be reset by pushing the handle back in (T/F)?
True
In what portion of the fire warning system is hydrogen contained in?
Core element
What does the ESD display in the front cockpit that is not displayed in the rear cockpit?
Enviornmental Indications
What is the normal operating limits for N_1?
60-104%
Where is the Engine Data Manager located?
The EDM computer unit is located in the left avionics bay
The EDM generates the information for displaying cockpit altitude (T/F)
True
What information does the Primary Engine Data Display present?
The PEDD presents information on: -Torque -ITT -N_1 -IOAT -Np
What is the gas generator speed and how is it measured?
Also labeled as N_1. N1 is the speed of the compressor turbine and is measured by a magnetic pulse sensor in the accessory gearbox.
What is the normal operating limits for hydraulic pressure?
2880-3120 PSI
What information/operation does the EDM provide about fuel?
It performs fuel balancing and and shows fuel quantity indications
What is the general purpose of the Engine Data Manager
The purpose of the EDM is to monitor and process engine operation data.
What is cockpit pressure differential measuring?
The difference in air pressure between the air pressure in the cockpit and the airpressure outside the cockpit.
In what portion of the fire warning system is helium contained in?
The sensor tube
What information/operation does the EDM provide about the electrical system?
A display of DC volts and DC amps
How is oil pressure measured?
By a transducer on the engine oil pressure line downstream of the main oil pump
Explain each oil pressure annunciator requirements
What is ITT and how does you find it?
Interstage Turbine Temperature, it is the temperature measured by sensors around the combustion chamber describing the temperature between the compressor and power turbines. It is found on the PEDD
