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madair

FMC SPD gone... Reads N1

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Quick question for everyone... After departing, and engaging LNAV/VNAV/CMD A, my PFD displays, in the upper left, "N1" and never changes to FMC SPD. This ultimately results in my aircraft never exceeding 26,000-28,000 ft, no matter how the FMC is programmed. What switch have I missed? Started CLDDRK... Thanks,Matt Adair

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The A/T FMA should stay in N1 mode until reaching cruise. The pitch FMA should read FMC SPD. When you reach cruise, it will switch to FMC SPD | LNAV | VNAV PTH. I have no idea why you can't exceed FL260 without more info.


Joe Sherrill

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I don't know how to describe it. But in every mode of flight (CLB/CRZ), there is a limit imposed upon N1.. Even when it states FMC SPD, the autothrottle will not increase thrust to reach a desired speed or continue a climb. Only had this problem the last 2 flights and I have no idea what has changed with my pre-flight setup. Very frustrating.

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What happens when you use level change to continue the climb and re-engage VNAV at cruise?


Joe Sherrill

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I don't know how to describe it. But in every mode of flight (CLB/CRZ), there is a limit imposed upon N1.. Even when it states FMC SPD, the autothrottle will not increase thrust to reach a desired speed or continue a climb. Only had this problem the last 2 flights and I have no idea what has changed with my pre-flight setup. Very frustrating.
What does your TAT say? Do you run any weather addon?It may just be too warm up there ...

Dave P. Woycek

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What is the TAT reading on the CDU at the FL you cant exceed? If it reads +20C - +45C then that could be limiting you climbing to a higher FL. There is a known issue with FSX giving erradict wind and weather information at high altitudes. I use Active sky to correct that problem and then there is a setting under FSUPIC to smooth winds and turbulence around the plane to prevent the dreaded S turns in LNAV.


Ash Keelson

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I just noticed that TAT read 45+... I haven't seen this before in FSX. That would explain things a bit I believe.

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