Do you know your N1 from your TIT?

1. 1) Where does bypass air go on a turbofan?
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   Bypass air goes around the engine core, but still passes through the engine cowling. In most modern high-bypass turbofans, bypass air accounts for the majority of thrust produced by the engine.

   Bypass air goes around the engine core, but still passes through the engine cowling. In most modern high-bypass turbofans, bypass air accounts for the majority of thrust produced by the engine.

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2. 2) N1 on a turbofan is _______.

   N1 is the speed of the first spool of a two-spool engine, which on a turbofan is the big fan on the front.

   N1 is the speed of the first spool of a two-spool engine, which on a turbofan is the big fan on the front.

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3. 3) 1 gallon of Jet A weighs ______.

   According to the FAA, Jet A weighs 6.8 pounds per gallon.

   According to the FAA, Jet A weighs 6.8 pounds per gallon.

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4. 4) Which of these two parts spin around the engine core in a turbine compressor section?
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   The rotor blades spin around the engine. Stators can be static or variable, but they don't rotate around the engine. They pivot based on required airflow and compression.

   The rotor blades spin around the engine. Stators can be static or variable, but they don't rotate around the engine. They pivot based on required airflow and compression.

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5. 5) Almost all modern turbofan engines found on airliners have _____.

   Axial flow engines compress air by moving it through smaller and smaller stages of the compressor, which is how almost all turbofan engines work.

   Axial flow engines compress air by moving it through smaller and smaller stages of the compressor, which is how almost all turbofan engines work.

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6. 6) What's a compressor stall?

   A compressor stall is a local disruption of airflow in the engine. They can range in severity from a small drop in power to a complete loss of compression.

   A compressor stall is a local disruption of airflow in the engine. They can range in severity from a small drop in power to a complete loss of compression.

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