Engines Flashcards
What maintains propeller control in the 22T?
An independent, remote propeller governor set to maintain 2500rpm
What maintains propeller control in the 20/22?
A CABLE connecting the power lever to the propeller governor, and a NOTCH maintains 2500rpm for cruise and 2700rpm for full-power.
(controls prop and engine speed)
What does the % Pwr block on the MFD represent?
20/22: Total Power Output combining RPM, Manifold “Hg, Fuel Flow, and OAT for the 1 reading we see.
22T: Total Power Output combining RPM, Manifold “Hg, Fuel Flow and MANIFOLD Air Temp.
What is TIT?
Turbine Inlet Temp.
How hard the turbos are working to compress induction air.
Sensed as Exhaust Air hits the Turbine Inlet.
What model engine is in the 20/22/22T?
20: IO-390-C3B6, 215hp
22: IO-550-N, 310hp
22T: TSIO-550-K, 315bhp
Major components of the 22T turbochargers
NACA air intakes
Filter
Compressor section of Turbo
Intercooler
(Overboost Valve)
Throttle body/Intake Manifold
Cylinders
Exhaust Manifold
(Wastegate - controlled by Sloped Controller)
Crossover pipe to other Trubo
Turbine section of the Turbos
Tailpipe
What does the Slope Controller do? How is it controlled?
Senses the Manifold Pressure being asked for (by the power lever position), and how much exhaust gas is needed to maintain it.
Manipulates the wastegate to open/close mechanically through oil pressure.
It is controlled automatically, by way of oil pressure.
When the wastegate is CLOSED where is Exhaust Gas routed?
To the Turbines
Normally Aspirated Engine Operation
Induction Air routed to cylinders for combustion.
Exhaust air is routed to Headers (designed to scavenge new air in), Collectors, and a Heat Exchanger for environmental use, Mufflers and then out the tailpipes.
20s exhaust system is combined at the collector, 22s is divided into 2 halves.
What are Magnetos?
Self-contained ignition generating devices providing spark independent of the electrical system.
How many spark plugs are on each cylinder?
2 on each (1 for each MAG)
Magneto arcing?
Air acts as an insulator INSIDE the MAGS.
22T’s MAGS are pressurized by the turbocharger to prevent ARCING (less dense air inside) which can lead to a rough running engine.
What else is unique about the SR Series MAGS?
They can adjust their own timing for the spark, so that it ignites just prior to Top Dead Center.
This allows time for the fuel/air combustion to reach its maximum potential during all phases of flight.
Doesn’t apply to starting.
How do the MAGS time spark for Starting?
Spark provided at Top Dead Center.
Impulse Coupling (continental)
Components of the Oil System? (4)
Wet Sump (bottom of Crankcase)
Engine Driven OIL Pump
Oil Filter
Oil Cooler (as needed)
