What is hung start?
A hung start occurs when the engine lights off normally but doesn’t accelerate to idle RPM. This is usually the result of insufficient power to the engine from the starter.
What is ITT in aviation?
Interstage Turbine Temperature ( ITT ) is the temperature of the exhaust gases between the high pressure and the low pressure turbines. The gas temperature is measured by a number of thermocouples mounted in the exhaust stream and is presented on a flight deck gauge in either degrees Fahrenheit or degrees Celcius.
What causes hot start?
A ” hot start ” in any variant of a jet engine refers to the circumstance where the manufacturer defined limiting temperature for start has been exceeded. The most common reasons for a hot start include insufficient airflow through the compressor, incorrect fuel scheduling and slow engine acceleration.
What is wet motoring?
A wet rotor motor is typically an asynchronous squirrel-cage motor (see Asynchronous motor ) whose rotors and bearings are operated in the fluid handled. Wet rotor motors either have a dry (see Canned motor ) or wet stator winding ( wet motor ).
What is wet starting a jet engine?
A wet start occurs when the engine fails to light up in a certain period of time when fuel is introduced into the combustion chamber. The indication of a wet start to the pilot is a positive rise and stabilisation of high pressure compressor with no rise in engine exhaust temperature.
What is dry cranking?
ENGINE VENTILATION ( dry cranking ) A dry cranking cycle ventilates the engine to remove fuel vapors after an unsuccessful start attempt on the ground. The flight crew can manually select cranking, by setting the ENG MODE selector to CRANK and the MAN START pushbutton to ON (MASTER switch OFF).
What is ITT warning?
An ITT warning tells you that your engine has been running at too high of a setting or too long. Jet engines are designed to only be at maximum thrust limits for very short periods of time. Like when you’re taking off until you can get the gear and flaps up.
Are turboprops safer than piston?
Though there is some mythology around turboprops not being as safe as private jets, rest assured — both turboprop planes and private jets have turbine engines, meaning their operation is virtually the same. Turbine engines are safer and more reliable than piston engines, which are typically found in smaller aircrafts.
What is SHP in aviation?
The power of a turboprop engine is measured in shaft horsepower ( shp ). Since turboprop engines are gas turbine engines, some jet thrust is produced by exhaust leaving the engine. This thrust is added to the shaft horsepower to determine the total engine power, or equivalent shaft horsepower.
Does heat affect car starting?
If your engine gets too hot, certain vapours can cause obstructions, which can make it harder for fuel to circulate. This, of course, will make it more difficult for your car to start. This isn’t really a problem with newer models, as most new cars are fitted with fuel injectors.
How hot is jet exhaust?
The burning mixture reaches a temperature of around 900°C ( 1650°F ). The exhaust gases rush past a set of turbine blades, spinning them like a windmill. Since the turbine gains energy, the gases must lose the same amount of energy—and they do so by cooling down slightly and losing pressure.