Hello Clive,
Impossible to know without actually measuring, but perhaps our restrictors
have different openings? Probably not, though.
On longer flights and with the engine (I assume) operating at or near the
same power each time, I realize that the error in total consumption for the
flight may not be too large. The consumption at idle and taxiing is of
relatively short duration, so that even though the indicated flow rate may
be quite wrong during ground operations, it does not have a big influence
percentagewise on the displayed total consumption.
Regards,
Svein
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