This document refers to aircraft with MTOW 45000T.
Is that 45000 tons? That's pretty heavy for me. Or am I interpreting the document incorrectly?
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It stands for metric tons, as indicated in the "GEN 2.1 Measuring system, aircraft markings, holidays" section of the AIP that you linked to as one of the units for mass.
That being said, the number format appears to be wrong and they most likely intended 45.000 metric tons, which works out to about 99,000 lbs. and is a somewhat common point to use for aircraft classification in other countries.
They clearly can't have meant 45 thousand tonnes. Even the likes of the AN225 and the A380 are nowhere near that big.
In parts of continental europe they use the comma as a decimal seperator. All too often I see datasheets (I work in electronics) where the text is in english but the numbers are using european format. However the fact that there seems little reason to use three decimal places for a number like that and the fact they use , as a thousands seperator in the fuel section makes me think this probablly wasn't the source for the original error.
I suspect whoever wrote it somehow mixed up kilograms and tonnes and this may have been compounded on proofreading by the above issue of some countries using decimal commas.