Quiz 4 Powerplant Flashcards
how many pounds of thrust do our engines produce
4,660
the -50 R engines are ____ _____ to an altitude prescribed by the AFM
flat rated
What does flat rated mean
an engine of high horsepower rating is constrained to a lower horsepower rating
what is spool
twin stool engine compressor and turbine connected on a single shaft - we have two (N1 and N2)
Axial flow
low pressure compressor - 4 rows of compressors and 4 rows fo stators
what is the difference between compressors and stators
compressors move and stators are stationary
what does the accessory drive run
oil pump
fuel pump - high pressure
starter/generator
alternator
fuel control unit
hydraulic pump
what drives the accessory case
N2 through tower shaft
for the Digital Electronic Control (DEEC) the ENG CMPTR should always be in the ______ position during normal operation
AUTO
The Digital Electronic Engine Control (DEEC) receives inputs from
engien inlet pressure
engine inlet temperature
interstage turbine temp (ITT)
N2 and N1 speeds
power lever angle (PLA)
what do the 6 inputs to the DEEC allow it to do
schedule, govern, and limit the engine
If the DEEC is running to fast what will happen
it will shut down
what does the fan do
it moves a large volume of air into bypass duct and engine core
its the thing you can see at the front of the turbine engine
Low pressure spool N1
consists of axial flow compressor and low-pressure turbine mounted on a common shaft
High pressure spool N2
centrifugal compressor driven by turbine on a concentric shaft
Combustion Chamber (can)
The fuel in the chamber atomizes fuel (turnes into a mist) and is put into the can through 12 nozzles and igntied by 2 igniter plugs
Turbine section
4 turbine wheels (1 high pressure (N2) and 3 low pressure (N1)) and 4 stator assemblies
what are the Engine limits for max takeoff thrust for 5 minutes
N1 - 100
N2 - 101
Max ITT in C - 1022
for HP Cokcs = when closed they
mechanically lock the thrust levers in the full idle position
for HP Cokcs = what connects to isolate fuel and hydraulic supplies
cable
what do the red warning light on each thrust lever indicate
fire in that respective engine
engine start first callouts
Start
N2 (at 12% and N1 rotation without making a call HP cock up)
Ignition
fuel flow
ITT
N1
(at 49 psi) Oil
the automatic power reserve (APR) may allow an automatic increase in _________ in the event of an _________
engine thrust
engine failure
the automatic power reserve (apr) in the auto mode will
activate when there is an uncommanded split in N2 occurs of 15% or more
how many positions are there for ignition and what are they
3 positions
on
off
auto
for the ignition position which will we normally operate on
auto
when will an uncommanded igntion activation happen
500 RPM dop in N2
are their oil filter and fuel filter annunciators
oil filter - no annunciator
fuel filter - do get annunciator
