A/T limit on the B734
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Join Date: Mar 2005
Location: singapore
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A/T limit on the B734
i can never understand what does it mean when this light comes on..the FCOM vol.2 merely states "A/T computer is calculating a single fixed N1 limit for affected engine(s) when FMC calculations become invalid or if either engine N1 is less than 18%".can anyone please provide me with a more detailed explanation?thanks a millions!
Join Date: May 2006
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All it is telling you is that the A/T N1 limit data from the FMC is invalid. I.e. when you select CLB1, CLB2 etc, the data is not being received by the A/T computer. If it is invalid it goes into an alternate mode and sets it's own N1 limit independant of the FMC. The limit light is there alert you to the fact the A/T computer N1 limit is being used instead of the FMC limit. The thrust mode annunciator normally shows dashes as well due to FMC invalid data.
