Hi guys,I am not sure if any body else has this problem, but here goes. The reference N1 numbers for my engines are showing different values for each other. if I select an Assumed temperature, then one engine shows the reduced thrust N1 while the other shows the full thrust N1 value. For example, if the full thrust N1 is say 94.6 and reduced is say, 92.4. One engine shows 94.6 and the other 92.4. Is this a bug or is this how it is on the real aircraft ?Cheers,Dinshaw Parakh.

Do you have the thrust limit selector knob on auto?

Yes Alfredo, that was the first thing I checked thinking that was the problem, but it was in auto.Dinshaw Parakh

Hi guys, I am not sure if any body else has this problem, but here goes. The reference N1 numbers for my engines are showing different values for each other. if I select an Assumed temperature, then one engine shows the reduced thrust N1 while the other shows the full thrust N1 value. For example, if the full thrust N1 is say 94.6 and reduced is say, 92.4. One engine shows 94.6 and the other 92.4. Is this a bug or is this how it is on the real aircraft ? Cheers, Dinshaw Parakh.

Are you sure that one of the throttles isn't slightly more advanced ??

Hi Frederic, this has nothing to do with the throttles. I am talking about the green colour N1 value which is displayed above the N1 gauge for each engine. Under normal ops, this value is derived by the auto throttle from the FMC. That is why as soon as I input an assumed temperature, the FMC will calculate the reduced thrust take off N1 and display that as the reference N1 for both engines. What happens here is that one engine is showing the value for the reduced thrust and the other is showing the value for the full thrust at the current OAT. as you know, reduced thrust is only fooling the computer to calculate the full thrust for the engine at the assumed OAT.Cheers,Dinshaw Parakh

Hi Frederic, this has nothing to do with the throttles. I am talking about the green colour N1 value which is displayed above the N1 gauge for each engine. Under normal ops, this value is derived by the auto throttle from the FMC. That is why as soon as I input an assumed temperature, the FMC will calculate the reduced thrust take off N1 and display that as the reference N1 for both engines. What happens here is that one engine is showing the value for the reduced thrust and the other is showing the value for the full thrust at the current OAT. as you know, reduced thrust is only fooling the computer to calculate the full thrust for the engine at the assumed OAT. Cheers, Dinshaw Parakh

Hi Dinshaw ! I understand you now ! It does seem rather strange alright.I don't have NGX yet so I can't try it. If I see it mentioned anywhere else I will get back to you. Fred.

Packs. If you don't have both packs on (or off), it'll show different numbers.

Thanks Frederic, much appreciated :)Dinshaw Parakh.Matt, thanks a lot. That could be the problem too. As far as I remember the packs were on. But like you said, that could have been my mistake. I can simulate that and check. I would feel like such an idiot if that was an oversight on my part :) just goes to show what Ryan and Robert et al were saying, don't think what you see is a bug. Hehehehe......Cheers,Dinshaw Parakh

You are right. So many posts here are about those things, because people don't know how the real thing works thanks to sloppy addons like the iFly 737.Or they do not read the manuals because that is too difficult... You even paid for those manuals, why not use them.

Spot on Matt, did try what you said and it is correct. I have seen this before on the CDU with the values being different when Packs are on and then off. Just never realized it was translated in to the reference N1 value. Thanks a lot for pointing that out. In addition, the difference coincidentally was about 0.9% which is about the right differencec in N1 with packs on or off. I do feel like a roya idioit now Cheers, Dinshaw.