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Questions tagged [engine-starting]

The process of taking an engine that is shut down and getting it running again.

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26
votes
6answers
68k views

How are turbine engines started?

What happens to a turbine engine from the time that a start is initiated until stable idle is achieved? What can go wrong?
7
votes
1answer
4k views

How is bleed air used to start a jet engine?

I know that most jet engines on commercial jets are started either with bleed air from an APU or bleed air from the other engine... But I'm not exactly sure how bleed air actually starts the engine? ...
22
votes
2answers
9k views

Why do ground crews rotate a radial engine's propeller before a motor/cartridge start?

In footage from WWII you often see the ground crew rotating the propeller of a radial engine a number of times before the pilots start the engine. I know it's not the same as hand-starting (hand-...
16
votes
2answers
14k views

Do F-22's use cartridge start to start engines?

What method does the F-22 use to start its engines? In the video below, you can see a flap open and flame and steam shoot out as the engine starts to spin up. Is this an example of cartridge start? ...
12
votes
2answers
2k views

How long does it take to restart a turbofan engine inflight?

I'm especially interested how long it would take to restart a turbofan engine after a hypothetically erroneous shutdown of an engine immediately after takeoff i.e., at an altitude at which the air is ...
11
votes
5answers
3k views

Is starting a jet engine without ground support possible?

We have had more... than... one question about jet aircraft taxiing about the airport without their jet engines running. Those address several issues such as cost vs savings and regulatory approval. ...
8
votes
1answer
3k views

Why do I hear the “real” engine noise only when the plane is on the runway?

I understand that (from other answers) planes taxi using engines only. But, when I'm a passenger, then why do I hear the "real" engine noise only when the plane is on the runway? So, if planes taxi ...
8
votes
2answers
1k views

Why are the engines on the MAX and neo prone to bowing?

The engines of the 737 MAX$^1$ and Airbus A320neo family$^2$ are [more] prone to bowing (shafts deforming if no debow is applied during start – as I understand it, this happens in a turnaround while ...
6
votes
2answers
6k views

Why is engine No.2 started first, instead of No.1?

I realized that some Boeing manuals recommend that the engine number 2 must be started first, is there any special reason for this?
4
votes
2answers
434 views

How long does it take for a regular size airliner jet engine to be warm?

How long does it take from starting of turbine or turbofan or turboprop, either by using an APU or other methods, until the engine is warm enough for safely extracting full power for takeoff?
2
votes
3answers
568 views

Is a recoil start (hand propping) allowed if it isn't mentioned in the aircraft manual?

Is a recoil start (hand propping) allowed without it being referenced in the aircraft manual? In a Cessna 150, for example.