Yes, everything helps : )
Intruder said:
if one throttle is moved outside the 1/2 knob limit, that engine will be set at an N1 proportional to the throttle position, and the other 3 will be trimmed together.
This seems to make more sense than the Maintenance Manual (on this point, there are so many variations in the descriptions of this process in various manuals, they are completely incompatible).
The Maintenance Manual says:
"The base EPR/N1 value for engine trim is the value that corresponds to the engine with the highest thrust thrust resolver angle (another 744 manual I have says second highest) The engines are trimmed to this target provided these engines have sufficient uptrim authority. If not, the EPR/N1 trim target is gradually downtrimmed until all operational engines can be trimmed to the highest common target."
I've always understood that engines cannot be downtrimmed (unless there has been uptrim). In this case, how can the highest throttle (which has not been uptrimmed) move closer to the lowest one?
Thanks.
Rgds.
NSEU.