Airbus Engine Start - The Basics
78,441
Published 2021-02-27
Timings:
APU start @1:20
Engine start sequence @3:00
After engine start flows @5:20
Acronyms used in this video:
APU - Auxillary Power Unit
N1 - Low pressure rotor speed (%) - the big one at the front
N2 - High pressure rotor speed (%) - the little one inside
FADEC - Full Authority Digital Engine Control
Trivia:
- For this video our simulator was set up with CFM56 engines. We can also configure it for the V2500 series.
- The CFM56 shares its origins with the same engine that powers the Rockwell B-1 Lancer. Unfortunately the afterbruning system wasn't carried over.
- At 01:15 we state there is another way available for starting the engine. That isn't the complete truth.... engine start can also be achieved using the Crossbleed Engine Start proceedure, should an APU be inoperative for example, or in extremis, airborne via a Windmill Relight.
Interesting Stuff / Further Reading:
- During the automatic engine start sequence the FADEC will automatically abort the start if it detects a hot start (high exhaust gas temperature), a hung start (N1/N2 does not increase above a certain %) or no light up (no light up....). After automatically closing the HP fuel valve, start valve and ignition, the FADEC dry cranks the engine for 30 seconds to clear out fuel vapours. Note: The FADEC does not close the low pressure fuel valve at this stage as it is upstream in the fuel system; it will be closed with the action of switching the engine master to off.
- For the CFM56 the normal start sequence is as follows:
N2 increases - Start valve in line, Bleed pressure indication green, Oil pressure increases.
At 16 % N2 - Indication of the active igniter (A / B or both.......).
At 22 % N2 - Fuel Flow increases
15 s (maximum) after fuel is on - EGT increases & N1 increases
At 50 % N2 - Start valve starts closing. (fully closed between 50 % and 56 % N2). Igniter indication off.
Note:
This video is published for familiarisation purposes with our simulator only and any views expressed within this video are our own. Some calls and checks have been omitted for brevity. Always refer to your company documentation or appropriate flight crew manual as the primary reference.
For bookings, further information and to learn about our simulators visit manchesterflightsim.com/
All Comments (21)
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Simple straight forward at a learning pace explanation....Very impressed.
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This info is excellent for sim reference. Thanks a lot for sharing! 🙂
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Great explanation! Thanks for your time and patience.
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This Aircraft has become my favourite because I have found that this Aircraft tackles turbulence much better than Boeing.Anyway this is my personal opinion
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Thanks I had learned something new today ❤
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Awsome info. I would really like to train one day in your centre.
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Bravo, excellent presentation.
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Very useful, Thank you!!
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Great video. Very helpful
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Thank you for this video!
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wow underrated
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Thank you so much
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Why you don't start fuel pumps?
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When push the Apu test button ecam was no actions
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Do you get THE APU alarm bell when doing the fire test from just using battery power alone?
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Dont you forgot to turn on the auto brakes to Max?
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On what portion does the PTU kick in?
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How come you didnt turn the fuel pumps on ?
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How long does an average engine start take? Is it the same always? How does it vary?
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HI, this info is excellent for training purpose. can i use this video for studying??? (Do not reproduction or/and copying. I’m only using the studying purpose. for my parties) best regards.
