Engine Flashcards
What engine the E170 has
GE CF34-8E turbo fan
High by pass
2 spool axial flow
Power output of the engine
13000- 14200
How is the engine controlled
By the FADEC ( dual channel)
What are the subsystems of the engine fuel system
Fuel control system
Fuel distribution system
Components of the fuel distribution system
Fuel pump
Fuel filter
Fuel manifold
18 fuel injectors
Components of the fuel control system
FADEC FMU Permanent magnet alternator Engine sensors Variable geometric actuator operavility bleed valve
What part of the engine is lubricated
The engine main shaft bearings
And the accessories gearbox
Where can you see the engine temp/pressure/quantity
Temp/press are display on ICAS
Oil quantity on MFD
How many igniters per engine
2 igniters .
One used for ground start , two for inflight start
Controlled by the FADEC
What happens when OVRD is selected
Both igniters are energized always
What does the starting system consist of
Air turbine starter ATS
Starter control valve. SCV
Describe N2 spool
10 stage compressor
2 stage HP turbine
Describe the N1 spool
Single fan
4 stage LP turbine
Can igniters be turned off in flight
FADEC will disregard any OFF selection in flight
Only on ground for dry motoring
What does the cyan line represents on the N1 dial on approach
When does it come on
It indicates the minimum N1 bleed requirements for Icing conditions
It comes on at 1200 feet AGL when anti ice on
Does the FADEC provides engine start protection
Only on ground for hung, hot , or no light off start
What will the FADEC do in case of a HOT start
Will not allow FF if ITT is greater than 120C
It will continue to run the starter (dry motoring) until temps falls below 120 and re introduce fuel
Describe the start sequence
7% N2 ignition
20% N2 fuel flow
20% N2 +5 sec light off
50% N2 ignition off
What provides under-speed and overspeed protection
The FADEC via the FMU
52% N2 to 102% N2
What is ATTCS and what controls it
Automatic take-off thrust control system
FADEC controlled
What happens if a trust reverse inadvertently deploys
The FADEC will limit respective engine to IDLE thrust
What is flex
Reduce takeoff thrust based on assumed temps
What percentage N1 needed for windmill start
7.2% N1
What is the main power of the engines FADEC
The PMA permanent magnet alternator
