Questions tagged [engine-starting]

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

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What is vapor lock?

Vapor lock occurs in piston engines especially during summers.. before starting engine we prime it and the engine starts but as soon as we reduce it to near idle or just above idle, engine tends to ...
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3 votes
1 answer
327 views

What is this sound for when starting the engine of an F-15?

If I remember correctly, to start up old fighters such as F-4s, you need an ASU but it looks new fighters do not need an ASU. Today, I was watching this video. It's a so cool video to know how new ...
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4 votes
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What is the proper procedure for a piston engine fire on the ground (e.g. during engine starting)?

I am wondering what is the correct sequence of action if there is a fire e.g. during engine starting. Of course I know that there are emergency procedures in each AFM and every single plane is ...
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9 votes
3 answers
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Why don't all cylinders have priming lines?

Questions about the primer for carburetor engines. Why does the primer only spray fuel to three (sometimes just one) of four cylinders. (Like Piper Cherokee or Seminole) And is it true that priming ...
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10 votes
1 answer
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Why the excessive wait after shutdown before using the manual starter valve on the PW1000G?

Why must there be a long period (measured in hours) between shutdown and startup, before using the manual engine start valve? Nine hours seems excessively long.
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5 votes
2 answers
214 views

Why do different manufacturers recommend different throttle settings at startup?

I was wondering why different engine manufactures recommend different throttle openings before engine start? On many Pipers 1/4 Inch is recommended while the Cessna 172N recommends 1/8 Inch and the ...
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2 answers
571 views

What exactly do "attempt" and "cycle" mean in these starter duty limitations?

Can someone please explain me this A320 Starter Duty Limitation in simple terms? E.g. for the CFM56 Starter: No running engagement when N2>20% 4 cycles of max 2 mins Pause between start attempts . ...
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7 votes
1 answer
515 views

What causes the horn-like noise during the start-up of some jet engines?

Here's the specific sound I'm talking about (it starts specifically 56 seconds into the video, as well as at 2:02 for the second engine): I've only really heard that ...
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3 votes
2 answers
2k views

Could you start both A320 engines with APU BLEED on?

I've seen some procedures where one engine is started with APU bleed, then APU Bleed is turned off to avoid ingestion of non-desired gases and then the second engine is started with ENG 1 Bleed on. ...
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33 votes
2 answers
5k views

Starting on the left magneto only - why?

I had been flying a PA-28 Archer III for quite a few months before I sat down to properly read through the POH. Something stood out to me about the starting procedure (emphasis mine) Open the ...
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16 votes
3 answers
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Why do aircraft piston engines require priming?

Aircraft piston engines generally require priming, but automobile engines don't seem to need it. Why doesn't cranking the engine with the starter pull in fuel mixture that would ignite without help of ...
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1 answer
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What does mean PPM unit and why it is the unit of flow rate for the ASU(Air start unit)?

I was seeing the specifications of several ASU(Air start unit)s and found out that makers of such machines provide the flow rate of the ASU in PPM. Why? why not Volumetric flow rate? Example: TS200 ...
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3 votes
2 answers
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When starting a turbine helicopter, why should one slowly increase RPM (throttle)?

After the ignition switch is turned ON, my Captain always increases the RPM (throttle) very slowly. I don't know why, because our helicopter has an ECU. One day, my Captain asked me "Do you know why ...
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3 answers
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Did people really hand-start big bombers in WWII?

I am not a pilot so I don't know anything about hand starting propeller aircraft. But I wonder how easily can the propeller fire up unexpectedly during the procedure even if it's done right. Whenever ...
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6 votes
3 answers
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Turbofan engine start - Why does ignition occur so early?

In another thread, two key steps of starting a turbofan (ignition and fuel introduction) are given as follows: With increased N2 rotation, ignition will be turned on. [...] With further ...
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1 answer
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How do aircraft batteries power the engine/APU? [duplicate]

I fail to understand how do batteries power up the jet engines/APU. Are they responsible for starting up the Ignition that ignites the air-fuel mixture? Or is there some other function which I'm ...
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2 votes
1 answer
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What drives the compressor before the turbine provides power?

I understand that the power extracted from the turbine is used to drive the compressor which sucks and squeezes air sent to the combustion chamber, and the cycle continues. But initially the ...
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16 votes
5 answers
12k views

What instructions should I give to an untrained passenger for Hand propping Cessna 172N as a pilot?

Does anybody know what is the most effective way of hand propping a Cessna 172N, with a passenger who is not mechanically inclined. So you need to give them the most easy to follow and simple ...
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6 votes
3 answers
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Why are engines with carburetors hard to start in cold weather?

Why are engines with carburetors hard to start in cold weather? And why is there a different procedure for hot start scenarios, after you've just shut down the engine and want to power up again?
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16 votes
2 answers
9k views

What is the loud noise of a helicopter when the rotors are not yet moving?

What is the loud noise when a helicopter is ready to start flying, but the rotor is not yet rotating? For example at Trump's "chopper talk", when he is intercepted by reporters on the way to Marine ...
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5 votes
1 answer
734 views

Why is the generator turned back off for starting the second engine on a King Air?

The engine start procedure for the Beechcraft King Air B200 says (emphasis mine): Right Ignition and Engine Start Switch – ON [R FUEL PRESS] annunciator – OFF Right Condition Lever – LOW IDLE (...
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1 answer
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How exactly are checklists shared between the pilots?

Plane startups are shared between the crew But how exactly? Does the captain do the startup and then ask the copilot if everything is correct? How exactly does it work? Is it aircraft specific or ...
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7 votes
2 answers
3k views

How is the JFS manual hand pump operated on an F-16?

The JFS (Jet Fuel Starter) on an F-16 allows for two attempts to start the engine. https://www.quora.com/How-do-you-start-the-engine-on-an-F-16-Fighting-Falcon However, if this fails, there is a ...
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0 votes
1 answer
485 views

PT-6 Starting problems - PT6A - 67B, installed on a PC12

we are having trouble starting our PC12. After introducing fuel at stabilized 13% ng, the engine spools up very slowly - it takes forever to get through 20, 30, 40%ng. We've had several hung starts, ...
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7 votes
1 answer
2k views

What is the procedure for restarting an F-16 in the air?

If there is a flameout on the F-16 in the air, what is the procedure for restarting it? I'm sure this is an elaborate checklist, so I'm only asking for an overview of the key parts, especially I'm ...
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0 votes
2 answers
1k views

Do large commercial aircraft have keys? [duplicate]

Do the likes of 737 or a320 or 777 or a380 as examples have keys to the aircraft or to initiate the flight deck? Or are aircraft unlocked and to start the engines it's just a flick of a switch or ...
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13 votes
2 answers
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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 ...
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2 votes
1 answer
318 views

Turbofan engine 2 spool - Turbine drives the compressor or Starter drives the compressor [duplicate]

I have read somewhere regarding turbofan engine 2 spool that says "LP or HP turbine will drive the LP or HP compressor" "During engine starting, the starter will drive the HP compressor via the ...
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3 votes
1 answer
330 views

Why is there a minimum altitude for at least some high-speed jet engine restarts?

While reading this other question about envelope constraints for jet-engine restarts, I noticed something odd in the graph provided (of the relight envelope for the Honeywell HTF7000 medium-bypass ...
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2 votes
1 answer
493 views

Why don't the ATR 42's propellers start/stop rotating simultaneously?

Why is it that for the ATR 42 one of the propellers begins to rotate before of the other? I've noticed that they also stop rotating at different times. Is there a reason for that or is it just for ...
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5 votes
2 answers
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What is the risk of leaving the MAN START PB 'ON' on the A320?

During a manual start on a A320, the ENG MAN START P/B opens the start valve which then runs the starter motor. During the MAN START process, at some point, the start valve closes automatically. What ...
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4 votes
2 answers
2k 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?
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-1 votes
1 answer
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In BGA or ATR's what are the major causes of ODOR in Cabin or Smoke in Cabin? [closed]

In BGA or ATR's what are the major causes of ODOR in Cabin or Smoke in Cabin? There are some of the maintenance activities that are related to removal of Engines or APU. Removal reason: Smoke in cabin ...
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7 votes
1 answer
1k views

For how long is an engine start clearance valid?

If a pilot receives a clearance to start the engines, is the clearance void if he doesn't start them within a certain amount of time? How much time is allowed for starting the engines and where is it ...
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13 votes
3 answers
5k views

Is center tank fuel required to start the 737-800 engines?

I have been doing some flights with the 737-800 and when there is no fuel in the center tank, the engines won't start. Is it like that in real life?
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10 votes
3 answers
3k views

Which commercial aircraft can perform a parallel engine start?

In various Youtube videos, e.g. this one, one can see that the Boeing 787 is capable of a parallel engine start (both engines are started at the same time). Are there any other commercial aircraft ...
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12 votes
2 answers
4k views

Why must some aircraft get permission to start their engines?

Some larger airliners must get ground control permission before starting their engines. Is this based on size? Does a Learjet need permission? Is this just turbines? For example does a DC3 or DC6 ...
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10 votes
1 answer
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What are the consequences of pumping the throttle in an carburetor piston engine airplane during start?

I have seen an expert commercial pilot pumping the throttle during start for a Cessna 152 and ever since I thought that was ok to do so, but recently studying for ATPL I read about that these ...
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3 votes
2 answers
5k views

Why are there different starter limitations for dry cranking and manual start on the A320?

I recently had this point clarified that when we place the mode selector to CRANK on the A320 we can dry crank the engine up to 5 mins. But the moment we place the mode selector to IGN/START then we ...
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2 votes
1 answer
859 views

What will happen if we start the A320 engines but we don't wait for the amber crosses on the E/WD to disappear?

My logic is that we should wait for the sensors to register the present indications so we have a proper idea of what state the engine is in particularly the EGT if we have to consider a manual start.
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2 votes
1 answer
214 views

Viability of Magnetically started engines [closed]

I am working on a school project of mine which involved testing the viability of a magnetically started jet engine. By magnetically started, I mean that there are magnets which accelerate the main ...
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9 votes
2 answers
5k views

Cessna 172: at which RPM should the oil pressure reach the green arc?

I am part of a team developing a Cessna 172 P model for FlightGear, an open source free flight simulator. We are now trying to improve the oil pressure and temperature simulation, and we have a ...
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5 votes
1 answer
2k views

Do some radial engine planes have a two-speed starter motor?

(YouTube) Watching the Connie fire up her engines I wondered, do some radial engine planes have a two-speed starter motor to replace the ground crew "pulling the props through"? In other words, low-...
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3 votes
1 answer
770 views

What is meant by "fuel flow: on " in checklists?

What is mean by "fuel flow: on " in checklists? For example: http://www.projectlear45.nl/docs/Checklist_LEAR45.pdf
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9 votes
1 answer
7k 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? ...
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19 votes
3 answers
20k 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? ...
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7 votes
2 answers
3k views

Is it possible to hand start modern planes?

I know that older planes must be hand started but are newer GA planes even able to be hand started by spinning the prop? If so, how do you do it safely without cutting your hands off or being pulled ...
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4 votes
1 answer
269 views

Could the Grumman G-21 Goose be started by punching the instruments?

In the 1985 movie "Commando", John Matrix (played by Arnold Schwarzenegger) initiates engine ignition simply by punching the cockpit dials after several failed standard attempts. Could this ever ...
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2 votes
3 answers
776 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.
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22 votes
2 answers
12k 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-...
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