Systems Flashcards
Percent of bypass air/purpose
80% of intake air, fuel efficient and quiet
Turbo Engine stages
Intake, compression, combustion, exhaust
Bleed air uses
Compressor section: AC/Heat/Pressurization/Deice boots/Engine start
AC vs DC
DC-flows one direction
AC- changes direction (lightweight, stable)
What is an amp
Base unit of current, tells you how much electricity you have
What is voltage
the pressure from an electrical circuit’s power source that pushes charged electrons (current) through a conducting loop
Describe Cessna 208 electrical system
28v system, 24V lead acid battery, 200 amp starter generator, 5 bus (PD,battery, 2 general, alt), 75amp alternator. Starter generator primary source, battery for engine start/preflight checks, energizes PDB, alternator is back up source
Convert AC to DC
TRU (Transformer Rectifier Unit) diodes to redirect current to one direction
Convert DC to AC
Inverter, switch to alter current
Circuit breaker vs Fuse
Fuse melts when overheat and cant be reset. CB shuts off current when overheated and after cooling can be reset
Diffuser vs Stator Vane
Diffuser slows down airflow in engine for uniform flow, SV redirects/keeps flow from spiraling in engine for uniform flow
Compressor Stall
Imbalance of airflow supply/demand
Hot start vs Hung start vs Wet start
Hot: too much fuel too early, high ITT
Hung: engine below starter cutoff speed, “hung Ng”
Wet: fuel doesn’t ignite properly
Accessory gear box
Used to drive fuel pumps/hydraulic pumps/Generator
APU
Auxiliary Power Unit
Small gas powered turbine used as back up power for generators in the air
Ground use: lighting/climate/avionics/hydraulics/engine start
