PT6A Flashcards
Explain which internal system are included in the PT6A?
Ignition
Propeller/ Governador
Air induction system
Cooling
Any other detail
Explain the PT6A functioning
Details about the turbine:
The engine is flat rated at 675 shaft horsepower (1865 foot-pounds
torque at 1900 RPM varying linearly to 1970 foot-pounds torque at
1800 RPM). The speed of the gas generator (compressor) turbine (Ng)
is 37,500 RPM at 100% Ng. Maximum permissible speed of the gas
generator is 38,100 RPM which equals 101.6% Ng. The power turbine
speed is 33,000 RPM at a propeller shaft speed of 1900 RPM
Engine Controls
Power Lever
Emergency Power lever
Prop Control lever
Fuel condition lever
QUADRANT FRICTION LOCK
ENGINE INSTRUMENT SYSTEM (EIS)
ENGINE INSTRUMENT SYSTEM (EIS)
TORQUE INDICATIONS
PROPELLER RPM INDICATIONS
ITT INDICATION
GAS GENERATOR RPM INDICATIONS
FUEL FLOW INDICATIONS
OIL PRESSURE INDICATION
OIL TEMPERATURE INDICATION
ENGINE LUBRICATION SYSTEM
system consists of a pressure system, a scavenge
system and a breather system. The main components of the lubrication
system include an integral oil tank at the back of the engine, an oil
pressure pump at the bottom of the oil tank, an external double-element
scavenge pump located on the back of the accessory case, an internal
double-element scavenge pump located inside the accessory gearbox,
an oil-to-fuel heater located on the top rear of the accessory case, an
oil filter located internally on the right side of the oil tank, and an oil
cooler located on the right side of the nose cowl.
Oil is drawn from the bottom of the oil tank through a filter screen where
it passes through a pressure relief valve for regulation of oil pressure.
The pressure oil is then delivered from the main oil pump to the oil filter
where extraneous matter is removed from the oil and precluded from
further circulation. Pressure oil is then routed through passageways to
the engine bearings, reduction gears, accessory drives, torquemeter,
and propeller governor. Also, pressure oil is routed to the oil-to-fuel
heater where it then returns to the oil tank
IGNITION SYSTEM
The ignition system consists of two igniters, an ignition exciter, two
high-tension leads, an ignition monitor light, an ignition switch, and a
starter switch. Engine ignition is provided by two igniters in the engine
combustion chamber.
AIR INDUCTION SYSTEM
The engine air inlet is located at the front of the engine nacelle to the
left of the propeller spinner
INERTIAL SEPARATOR SYSTEM
EXHAUST SYSTEM
The exhaust system consists of a primary exhaust pipe attached to the
right side of the engine just aft of the propeller reduction gearbox. A
secondary exhaust duct, fitted over the end of the primary exhaust pipe
carries the exhaust gases away from the cowling and into the
slipstream.
ENGINE FUEL SYSTEM
ENGINE FUEL SYSTEM
