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N1 Limitation

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Guest grummen

Is there any way to override the N1 limitation set by the fmc.

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Ms/Mr Nameless,First, take a look at the pinned topic Forum Guidelines and please sign your posts with your real name.Second, to your question. If by overriding you mean increase the value, then no there's no way to do it. The maximum value is given to the FMS from the ECCs (Engine Control Computers?) and will give you the maximum thrust at any given time. You can however decrease the values by means of using assumed temperature N1 values or derated N1 values. This is done on the N1 LIMIT page on the FMC and is described in the manual and you'll get plenty of info here if you do a search.Hope it helps,


Mats Johansson
PMDG Flight Test Dept
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>Is there any way to override the N1 limitation set by the fmc.On which aircraft? (Real or otherwise?).Un-derated takeoff limit is usually about the same as the EEC-controlled engine limit, so, with the EEC's operating, you won't get any extra thrust. Depending on the type of aircraft, however, you could switch the EEC's off or put them in ALTN mode and override this limit (however, at risk of damaging your engines).In cruise, with the EEC's operating, with the FMC dictating CRZ limit (usually lower than T/O or CLB), you can still disengage the A/T and push the thrust levers to the wall and get full (EEC limited) thrust. On some aircraft you can also manually select the current thrust mode. Selecting, say, CLB limit in cruise will give you a higher limit thrust limit than just CRZ.Hope this makes sense.Cheers.Ian.

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