Engines Flashcards
What type of engines are in the m-346?
Honeywell F124 GA 200
How much thrust is produced per engine?
2850kg
____ bypass engine, 67% of air through Hp compressor section.
Low
How many stages in the Lp fan?
3
How many stages in the Hp compressor, and what types?
5 (4 axial + 1 centrifugal)
What system is supplied air from the 3rd stage of the Hp compressor, and where is it used?
ECS, cabin/avionics cooling, OBOGS, G-suit, rain removal, pressurization
During ground ops, what could correctly trigger auto-relight caption?
If the pilot commands a throttle reduction at the same time that the 4-5th stage anti-surge bleed valve closes.
How many annular fuel nozzles are there and where are they located?
12, in the combustion chamber
Hp and Lp turbines are on _____ shafts that rotate in _____ direction _________. (I think)
concentric, clockwise, independently
Order of engine components?
- fan module
- front frame module + IAD gearbox
- compressor module
- combustion chamber module
- HP turbine module
- LP turbine module
- exhaust system (~separate?)
What does the IAD gearbox provide mounting/drive for?
- engine lube pump
- engine fuel pump
- aircraft generator
- aircraft hyd pump
- air turbine starter
Are the engine oil systems connected?
No, each engine has its own independent system
Oil tank capacity and consumption?
4.85L, consumes 0.17L/h
Oil system allows ___sec continuous ops at 0G.
30
________ pressure sensor triggers a ____________ caution in the event it is below scheduled, but has a 30 sec delay to avoid transient cautions during negative G.
Differential, [L or R] ENG OIL P
Three conditions for fuel to be supplied:
- mode switch in norm or idle/start
- engine is rotating
- electrical power is applied
T/F: Fuel pump operation is possible even if engine is shut off.
True
Fuel Shutoff valve is shut when mode switch or __________.
throttle is at stop position
What controls engine fuel flow, compressor guide vanes position, engine ignition, fuel and oil systems, modulation of engine transient operation and engine automatic relight in case of flameout detection. It also provides automatic protection against engine over temperature and overspeed and against engine surge, with no limitations on throttle movements.
Engine Control System (2 Channel FADEC)
If FADEC unable to control engine due to failure(s), reverts to ____________ mode. What does this entail?
FAIL-SAFE, ENG reverts to min fuel flow and likely flameout
What is the engine ignition system powered by?
essential batt bus
How many igniters per engine?
One.
When is the igniter excited? (ground + flight)
ground - above 10%Nh
flight - from the moment flameout is detected
Where must the throttle be for an automatic start?
anywhere from idle to max, post start the power will react accordingly when mode switch is in norm
When is an ATS start recommended?
below 10% NH
How do you initiate assisted start?
Hit the flashing green button when ENG mode is at idle/start.
When is relight initiated?
as soon as the throttle moves from stop to idle
When should relight be initiated? Why?
within 2 mins of eng shut down to allow max probability of relight (temp drop)
What do you need to do for an auto-relight?
nothing
What is ground idle, and when does it change?
1.11KN
below -35C it becomes as req’d for generators
Until what altitude is flight idle constant?
up to 10k’
When’s the transition from flight idle to ground idle?
5 seconds after main wheels touchdown after nose wheel touches down
Describe moderate overtemp.
EGT exceeds max temp by 28deg for more than 5 sec, or >871 for more than 5 sec during start. Caution disappears when it cools back below limit.
Describe severe overtemp.
EGT exceeds max temp by 56deg (or 899 for start), caution remains illuminated
