Engine Flashcards
What type of engines does the emb-145 have?
Rolls-Royce AE3007A1 High bypass ratio (5-1) Two spool Axial flow Turbo fan engine
What are the different sections of the engine.
Fan Compressor Combustion Turbine Exhaust
What are the components of the engine?
24 blade fan 14 stage compressor 5 variable pitc 2 stage high pressure turbine, compressor 3 stage low pressure turbine, fan Accessory gear box Forced air mixer
How many FADEC’s are there and where are they located?
2 per engine A and B
Located in the forward electronics compartment.
What is in the compressor section of the engine?
A 14 stage axial flow compressor
What parts of the compressor are moveable?
The inlet guide vane and the first five stages of the compressor. (Compressor Variable Geometry)
What is the fan connected to and how?
The 3 stage low pressure turbine
By an inside shaft.
How is the compressor driven?
By the 2 stage high pressure spool
How is the accessory gear box driven?
By a tower shaft driven by the 2 stage high pressure spool.
What does ground idle ensure for the airplane?
Avoid flame out, overheat, and inability to accelerate
Adequate bleed flow and temperature for ECS
Adequate generator speed
What does flight idle ensure?
Ground idle +
Anti icing
Go around in 8 seconds
Where is bleed air taken from? Why?
9th low pressure
10th internal cooling
14th high pressure
When does the 14th stage open?
Low thrust
Engine starts
Anti ice
What is in the accessory gear box?
Fuel pump metering unit 2 generators Hydraulic pump Oil pump Air turbine starter Permanent magnetic starter
How many fuel nozzles and igniter plugs are there?
16 fuel
2 igniters
What are the fuel system components?
Fuel pump metering unit (Engine and centrifugal pump) Fuel cooled oil cooler Compressor variable geometry Fuel flow meter Fuel nozzles
What is the primary and secondary functions of the fuel system?
Filter and meter fuel for combustion
CVG
FCOC
What does the oil system consist of?
12qt tank Pressure pump Oil filter ACOC FCOC sump and bearings
What does the air oil separator do?
Removed foam generated by air seals and vents it out the top of the tank.
When does oil bypass the FCOC?
When fuel temp is over 93.3 C
Differential pressure is over 50psi
What are the components of the ignition system?
2 igniters powered by PMA 10%
FADEC commands ignition at 14%
What power the FADEC’s?
Essential DC 1 and 2
Until 50% N2 then PMA
Which FADEC controls which igniter?
FADEC A controls igniter A
FADEC B controls igniter B
How is the Starter Control Valve operated?
Electrically by the starter.
What are the sources of air for an engine start?
Cross bleed
APU
Ground air
What is the engine start sequence?
0% FADEC powered, signals igniter 10% PMA Powers igniter 14% FADEC commands ignition 28% FADEC commands fuel 50% FADEC powered by PMA 53% ATS valve closes 56.4% starter cuts out 56.7% FADEC successful start
How do the thrust reverser doors open?
Hydraulic actuator pivoting the doors open.
How many locks are on the thrust reverser?
3
Primary - holds load
Secondary - unloaded
Tertiary - unloaded
How are the primary and secondary lock controlled and actuated?
Electrically controlled
Hydraulically actuated
How is the tertiary lock controlled?
Electrically controlled
Electrically actuated
When will the thrust reversers deploy?
Main gear WOW +25kts
Main and nose gear WOW
How is control transferred from one FADEC to the other?
Automatically on each start or a fault is detected
Manually by the selector knob
When will the FADEC’s command T/O 1 mode?
T/O 1 mode selected T/O 1 button pressed Thrust levers beyond detent Landing gear down below 15,000' Engine disagree Power interruption.
When will the FADEC’s allow CON mode?
Above 300’ and gear up
Above 1700’
When can CLIMB and CRUISE mode be selected?
Above 500’ gear up
Above 1700’
What triggers ATTCS?
TLA opposite engine below 38
Either FADEC receives inop signal
Doesn’t arm or disarm in 2 seconds
What are the FADEC discrete outputs?
N2 speed each engine
Environmental control system off
What happens when n1 is lost?
N1 is derived from the corresponding N2
What powers the FADEC’s potentiometers?
FADEC
