200 Engines Flashcards
What type of engines does the CRJ have?
General electric CF34-3B1 HOT AND HIGH
What is the normal takeoff thrust rating?
8729 pounds per engine
How much thrust is produced when the APR is activated?
9220 pounds, which is a 2% increase
Explain the general make up of the N1 and N2 sections of the engine.
The N1 section is a single stage fan connected to a four stage low pressure turbine by A shaft. The N2 sec. is a 14 stage axial flow Compressor connected to a two-stage high pressure turbine by a shaft.
What section of the engine drives the accessory gearbox?
The N2 Compressor
The bypass N1 airflow on take off produces how much of the thrust?
80%
Do the thrust reverses direct core or bypass airflow forward to assist in breaking?
The bypass airflow is diverted forward
What improves efficiency of the N2 compressor and protects against stall and surge damage?
A variable geometry Compressor (VG). The VG change is the angle of attack of the inlet guide veins and the first five stages of the Stater Vanes. The changing of the angle of attack optimizes the airflow for best efficiency. The fuel control unit (FCU) uses fuel to hydraulically change the angle of the vanes.
Where is the ITT measured? And what does it stand for?
Inter Turbine Tempurate it is measured between the high and low pressure turbine.
What equipment does the accessory gearbox drive?
Alternator, which powers the N1 control amplifier. Lubrication pumps for the engine. Hydraulic pump. Fuel control unit and engine fuel pump. Integral drive generator (IDG)
What are the different jobs of the fuel system?
Provide motive flow to the main ejector pumps and scavenge pumps.
Lubricate and actuate servos in the FCU.
Cool engine oil.
Adjust the variable geometry compressor linkage.
what are the different ways to stop fuel flow to the engine?
Shut off the thrust lever.
Press the fire switch light on the glareshield panel.
What is the purpose of the fuel oil heat exchanger?
The exchanger warms the fuel and cools the engine oil
Are any of the fuel filters displayed on the fuel synoptic page?
Yes, one for each engine.
How would you know the fuel temperature at the fuel filter?
The temperature is displayed next to the fuel filter on the fuel synoptic page.