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What is flight idle?
An engine RPM in flight at a given altitude with the throttle set to the minimum, or idle, position. The flight idling RPM typically increase with an increase in altitude.
What is the difference between minimum idle and approach idle?
“Minimum idle” and “approach idle.” Minimum idle has a lower thrust setting for ground operation and most phases of flight. Approach idle has a higher thrust setting, and therefore, decreases acceleration time for a go-around.
What is idle descent?
Idle descent in many jets is around 3,000 feet per minute until reaching 10,000 feet. There is a speed restriction of 250 knots below 10,000 feet, therefore the flight management computer will slow the aircraft to 250 knots and continue the descent at approximately 1,500 feet per minute.
What is low idle and high idle?
Air intake: The job of the air intake is to move air into the engine. When it’s damaged, more air can pass through, which will cause the engine to idle high or low. When it doesn’t work correctly, the engine may idle at various speeds.
What is takeoff power?
The amount of power that an engine is allowed to produce for a limited period of time for takeoff. The use of takeoff power is usually limited to 5 min for reciprocating engines and up to 2½ min for gas turbine engines. This may not always be the case.
Can flight stop air without moving?
A: Techincally, there is only one way for the aircraft to remain hanging motionless in the air: if weight and lift cancel each other out perfectly, and at the same time thrust and drag cancel each other out too. To stay in the air and sustain its flight, an aircraft needs to be moving forward.
What is the idling of a jet engine?
Idling is the lowest speed setting on a running engine, jet or piston, aircraft or marine or automobile. In modern turbofan jets, there are two idle settings: flight idle, and ground idle.
Why do high bypass engines have flight idle?
Flight idle is designed to allow the engine to go to the higher power settings faster. As you may, or may not, know, high bypass engines have air management issues. That’s the air within the core engine.
What happens to a FADEC engine at flight idle?
At flight idle, they are moving to their high power positions. In fact, the threat of stall/surge is greatly diminished at or above flight idle. Modern, FADEC engines are great at controlling chapter 75 (engine air). A PW20XX can go from flight idle to 95Z% take-off in 2 seconds.
When does the aircraft return to ground idle?
Logic circuits determine that the aircraft is in the air and in the approach and landing configuration to command the increase to “Flight Idle”. The idle setting is returned to the low, or “Ground Idle” value after a predetermined time interval after the landing gear touchdown.